Shower Remodeling Across the East End District, Warm Springs Avenue & Old Penitentiary
Cast iron clawfoot tub-to-shower conversions on 1908–1928 East End District bungalow baths, preserved-1930s-hex-tile walk-ins on Warm Springs Avenue Tudor estates, leaded-glass bath window preservation, geothermal radiant baseboard coordination — Schluter Kerdi waterproofing on every shower, EPA RRP-certified throughout, and interior scope that proceeds at standard City of Boise speed because HPC review applies only to exterior work.
Shower remodeling in the East End is a discipline-specific scope shaped by four overlays the rest of Boise doesn't carry simultaneously: pre-1925 East End District Craftsman bungalow baths with original cast iron clawfoot or alcove tubs (300–400 lbs, often break-out demolition in place because the tub can't be carried through a 26-inch original doorway), plaster-and-lath walls with horsehair binder requiring different demolition protocol than drywall (plaster repair at $35–$85 per square foot where preserved-wall sections meet new shower substrate), pre-1980 vinyl asbestos sheet flooring or mastic universal under existing East End bath floors (testing $300–$700 per sample, abatement $2,500–$6,500 when triggered), and the City of Boise Geothermal Heating District distribution on Warm Springs Avenue properties where existing radiant baseboards run along bath walls — shower scope at the bath wall must coordinate with the geothermal hardware. A critical permit fact distinguishes East End shower work from broader bath or kitchen scope in the District: interior shower scope is fully exempt from Historic Preservation Commission review even when the home is squarely inside the East End or Old Penitentiary District boundary, so shower projects proceed at standard City of Boise speed (2–4 weeks over-the-counter plumbing permit, 3–5 weeks for full plan review when structural work is in scope) without the 4–8 week HPC overlay that exterior scope triggers. HPC only enters the picture when scope crosses an exterior wall — a new exterior penetration for a relocated drain, a window enlarged for natural light at the shower wall, an exterior hood vent. The dominant project is the cast iron tub-to-shower conversion in a 1908–1928 East End District Craftsman bungalow bath — remove the original cast iron tub (typically break-out demolition in place with chipping hammer because the 300–400 lb tub can't fit through the 26-inch original doorway), abate pre-1980 asbestos mortar bed substrate when pre-screen returns positive, demolish plaster-and-lath wall sections per protocol, rebuild on Schluter Kerdi waterproofing, install a walk-in with period-correct vocabulary (1-inch or 2-inch hex mosaic floor in white-with-black-dot, 3×6 subway walls to chair-rail height with pencil-liner cap, polished chrome or polished nickel valve from House of Rohl Country Bath or Newport Brass Astor, frameless 3/8-inch tempered glass). The Warm Springs Avenue tier includes preserved-1930s-hex-tile walk-ins on Tudor Revival baths where original tile floor is intact and worth preserving outside the shower footprint, leaded-glass bath window preservation as architectural feature, and geothermal radiant baseboard coordination at bath walls. Iron Crest's East End shower work is anchored on Schluter Kerdi waterproofing without exception (lifetime manufacturer warranty when installed by certified installer — Iron Crest is certified), EPA RRP-certified lead-safe practices throughout (universal in pre-1978 stock — that's essentially the entire District), pre-1980 asbestos pre-screen on mortar beds and substrates, cast iron break-out demolition for bungalow alcove geometry, plaster-and-lath protocol with horsehair-binder plaster repair, geothermal coordination on Warm Springs Avenue scope, and a 5-year workmanship warranty layered on manufacturer materials warranties.
East End shower strategy varies sharply by sub-area because original tub type, bath dimensions, plaster-and-lath wall stock, geothermal distribution, and what tile is worth preserving all change between the Warm Springs Avenue National Register corridor, the East End District bungalow belt, the Old Penitentiary District, and outside-District infill.
Pre-1900 Warm Springs Avenue Queen Anne and grand estate baths
Substantial baths on Warm Springs Avenue Queen Anne mansions with original cast iron clawfoot tubs as character-defining elements (often refinishable and worth preserving as centerpiece). Some baths carry original leaded-glass windows worth preserving as architectural feature. Walk-in shower addition typically in adjacent space rather than replacing the tub. Premium-tier scope. Sometimes geothermal distribution from the City of Boise Geothermal Heating District serves the bath wall — radiant baseboards or fan-coil units must coordinate with shower scope.
1900–1925 Warm Springs Avenue Colonial Revival, Tudor, grand Craftsman estate baths
Larger 55–80 sq ft baths on Warm Springs Avenue with original cast iron alcove tubs, sometimes original 1930s hex floor tile in remarkable condition with patina that buyers pay premiums for, sometimes Tudor steel-sash leaded-glass bath windows. Modern scope can sometimes preserve original tile floor while replacing the tub area with new walk-in shower — period continuity that newer-era bathrooms can't replicate. Geothermal radiant baseboards along bath walls common on this stock.
1908–1928 East End District Craftsman bungalow baths (locally designated)
Tight 35–55 sq ft original baths on East End District bungalow belt. Original cast iron clawfoot or alcove tub (300–400 lbs — almost always requires break-out demolition in place with chipping hammer because the tub can't be carried through a 26-inch original doorway). Plaster-and-lath walls with horsehair binder universal — different protocol than drywall, plaster repair at $35–$85 per square foot. Galvanized supply and cast iron drain universal. Pre-1980 asbestos mortar bed common. Locally designated East End Historic District — but interior shower scope is exempt from HPC review. Owner usually wants walk-in shower conversion; sometimes preserves clawfoot elsewhere in bath.
1880s–1930s Old Penitentiary District working-class cottage baths
Locally designated Old Penitentiary Historic District. Modest original baths on late-1800s ranchhand cottages and early-20th-century working-class homes. Sometimes original cast iron tubs, sometimes already replaced in previous renovation cycles. Modest replacement scope. Interior shower scope is exempt from HPC review.
Post-1940 East End infill (Reserve Street / Park Center, Reserve / Eastland streets)
Sometimes outside the formal Historic District boundary. 5-foot steel alcove tubs (60–80 lbs, lighter than cast iron predecessors) in post-war pink, blue, mint-green, or sea-foam tile bathrooms. Modern stud spacing rather than balloon framing. Modern scope typical without HPC overlay when outside District. Pre-1978 lead-paint applies, pre-1980 asbestos mortar bed possible.
Five recurring shower-remodel shapes account for nearly every East End project. Sub-area, original tub type, period-preservation priority, and accessibility brief drive which one fits.
1. The 1908 East End District Bungalow Cast Iron Tub-to-Shower Conversion
Remove the original cast iron clawfoot or alcove tub (typically break-out demolition in place with a chipping hammer because the 300–400 lb tub can't fit through a 26-inch original doorway on East End District bungalow geometry). Abate pre-1980 asbestos mortar bed substrate when pre-screen returns positive. Plaster-and-lath wall demolition per protocol. Rebuild with Schluter Kerdi waterproofing on cement-board, install walk-in shower with period-correct vocabulary: 1-inch or 2-inch hex mosaic floor in white-with-black-dot, 3×6 subway walls to chair-rail height with pencil-liner cap rail, polished chrome or polished nickel valve from House of Rohl Country Bath or Newport Brass Astor, frameless 3/8-inch tempered glass. Plaster-keyed connection where preserved-wall sections meet new substrate. Galvanized-to-PEX supply repipe at the wet wall.
Target homes: 1908–1928 East End District Craftsman bungalow belt baths with intact period architectural character. Permit: standard plumbing/electrical permits, building permit when structural work is in scope. Interior-only — no HPC review.
2. The Warm Springs Avenue Preserved-1930s-Hex-Tile Walk-In
Walk-in shower built in a 1925–1940 Warm Springs Avenue Tudor Revival or Colonial Revival bath where the original 1930s hex mosaic tile floor is intact and worth preserving. New shower goes in the existing tub alcove with careful demolition (hand tools rather than power demolition) at the tile-meets-tub boundary so the original hex pattern stays intact on the rest of the floor. Schluter Kerdi waterproofing within the new shower footprint, period-correct subway walls keyed to original floor pattern, frameless glass enclosure, period-correct plumbing trim. Sometimes paired with leaded-glass bath window preservation. Geothermal radiant baseboard coordination at bath wall where applicable. Rare and rewarding scope — period continuity that newer baths can't replicate at any cost.
Target homes: Pre-1940 Warm Springs Avenue Tudor Revival, Colonial Revival, and grand Craftsman estate baths with intact original tile floors worth preserving. Permit: standard plumbing/electrical permits.
3. The Warm Springs Avenue Premium Spa Shower with Period Details
Top-tier scope on a Warm Springs Avenue Queen Anne, Colonial Revival, Tudor, or grand Craftsman estate bath. Larger 4'×6' or 4'×7' walk-in shower with multi-function fixtures (rain head ceiling-mount, handheld on slide bar, 2–4 body sprays, optional steam capability), heated bench and floor (sometimes hydronic integration with geothermal), premium tile (honed marble or large-format porcelain in marble look, sometimes period-correct subway-and-hex vocabulary), period-correct plumbing fixtures throughout, frameless low-iron Starphire glass enclosure. Leaded-glass bath window preservation where applicable. Geothermal radiant baseboard coordination at bath wall. Sometimes paired with claw-foot tub preservation as bath centerpiece in adjacent space.
Target homes: Warm Springs Avenue National Register district premium primary baths ($1.2M–$5M+ home valuation). Permit: standard plumbing/electrical, building permit when structural work is in scope.
4. The Clawfoot Tub Preservation with Walk-In Addition
Bath retains restored cast iron clawfoot tub as centerpiece while adding new walk-in shower in adjacent space. Often involves footprint expansion absorbing a small adjacent closet or hallway corner on tight East End District bungalow geometry. Clawfoot interior surface refinishing, exterior surface clean and repaint where painted, claw feet hardware replacement, new freestanding tub filler (period-correct from House of Rohl, Waterworks, or Sun Valley Bronze). Schluter Kerdi waterproofing for new walk-in shower. Period-correct hex-and-subway tile vocabulary. Frameless glass enclosure for shower. Common on East End District and Warm Springs Avenue scope where owner wants both original character and modern function.
Target homes: East End District and Warm Springs Avenue primary baths wanting both original character and modern function. Permit: standard plumbing/electrical permits, building permit when structural work is in scope.
5. The Secondary Bath Shower (Guest, Kids, Hall)
Secondary bath shower renovation — guest, kids, hall on East End District, Warm Springs Avenue, or Old Penitentiary scope. Period-correct but slightly less elaborate than primary. Walk-in shower with Schluter Kerdi, period-correct hex-and-subway tile vocabulary or modern subway depending on architectural brief, mid-premium fixtures (Kohler Memoirs Stately, House of Rohl Country Bath). Plaster-and-lath demolition protocol on pre-1925 stock. EPA RRP throughout. Cast iron break-out demolition where original tub is in place.
Target homes: East End secondary baths. Permit: standard plumbing/electrical permits.
The East End / Warm Springs spans roughly two square miles with distinct sub-neighborhoods, each with its own remodeling personality.
Warm Springs Avenue Historic District
The premier residential corridor along Warm Springs Avenue from approximately Broadway Avenue to Walnut Street, listed on the National Register of Historic Places. Magnificent turn-of-century homes including Queen Anne Victorians, Colonial Revivals, Tudor Revivals, and grand Craftsman estates from 1890–1925. Many homes use geothermal heating drawn from the underlying hot-water aquifer (one of the largest geothermal districts in the United States). Lots typically 0.25–0.75 acre. Home values $1.2M–$5M+.
East End — Bungalow Belt
The dense bungalow neighborhoods between Broadway Avenue and the Foothills, north of Front Street. Predominantly 1908–1928 Craftsman bungalows on smaller lots (50' × 125' typical). Architectural cohesion is strong — built-in cabinetry, exposed rafter tails, low-pitched gable roofs, deep front porches. Locally designated East End Historic District requires Historic Preservation Commission review. Home values $550K–$1.4M.
Old Penitentiary Historic District
The historic neighborhood surrounding the Old Idaho Penitentiary museum, including portions of Old Penitentiary Road and adjacent streets. Mix of late-1800s ranchhand and early-20th-century working-class cottages, plus newer infill from the 1950s–80s. Locally designated historic district with Historic Preservation Commission review. Home values $475K–$950K.
Reserve Street / Park Center area
The corridor along Reserve Street and the Park Center development north of the river. Mix of pre-1925 Craftsman, 1950s-60s ranches, and newer 1990s-2010s infill. No Historic District constraint for most of this area. Home values $475K–$925K.
East Boise — Highlands transitional
The transitional zone between East End and the Foothills, climbing from Warm Springs Avenue up toward Table Rock and the Boise Foothills. Mix of 1920s-30s homes built on the original lower elevations of the Foothills and 1960s-80s ranches and contemporaries. Some properties have geothermal heat extending from the Warm Springs district. Home values $650K–$1.8M.
Reserve / Eastland infill streets
Smaller streets and infill developments throughout the broader East End. Mix of original pre-1925 homes interspersed with 1940s-50s post-war housing and 1960s-80s ranches. Lots vary widely. Sometimes outside formal Historic District boundaries. Home values $475K–$885K.
Pricing reflects four East End realities: Schluter Kerdi waterproofing without exception (lifetime manufacturer warranty), demolition complexity in 80–120 year old stock (cast iron break-out demolition for bungalow alcove geometry, plaster-and-lath protocols on pre-1925 walls, asbestos abatement on pre-1980 mortar beds), period-correct tile vocabulary labor where architectural brief calls for hex-and-subway rather than modern large-format, and geothermal radiant baseboard coordination on Warm Springs Avenue scope.
East End / Warm Springs shower remodeling ranges
Secondary bath shower (Walk-in shower with period-correct tile and mid-premium fixtures): $22,000–$35,000 / 4–6 weeks
1908 East End District bungalow cast iron tub-to-shower conversion (Cast iron break-out demolition, plaster-keyed connections, period hex-and-subway tile): $28,000–$45,000 / 5–7 weeks
Warm Springs Avenue preserved-1930s-hex-tile walk-in (Walk-in built while preserving intact original 1930s tile floor outside shower footprint): $32,000–$48,000 / 6–9 weeks
Clawfoot tub preservation with walk-in addition (Preserve clawfoot tub centerpiece and add new walk-in shower in adjacent space): $35,000–$55,000 / 6–8 weeks
Warm Springs Avenue premium spa shower with period details (Multi-function spa shower with period aesthetic and geothermal coordination): $42,000–$62,000 / 6–9 weeks
Pricing assumes Iron Crest's standard East End scope: City of Boise plumbing and building permits (interior-only shower scope is exempt from Historic Preservation Commission review even when the home is within the East End or Old Penitentiary District boundary, so the work proceeds at standard City speed rather than carrying the 4–8 week HPC overlay that exterior scope triggers), pre-1980 asbestos pre-screen on mortar beds and substrates with licensed abatement when triggered, EPA RRP-certified lead-safe practices on every pre-1978 home (universal in the District — essentially every East End address), Schluter Kerdi waterproofing membrane on every shower without exception with lifetime manufacturer warranty (Iron Crest is Schluter-certified), plaster-and-lath demolition protocol on pre-1925 stock with horsehair-binder plaster repair at $35–$85/sq ft when triggered, period-correct tile and fixtures, frameless 3/8-inch tempered glass enclosure with hardware in matched finish family, anti-scald thermostatic shower valve, heated floor where applicable (sometimes hydronic integration with geothermal on Warm Springs Avenue scope), geothermal radiant baseboard coordination at bath wall on Warm Springs Avenue scope, and a 5-year workmanship warranty layered on manufacturer materials warranties. Contingency budget of 12–15% above contract value for older-home discovery on pre-1925 East End District stock.
The Warm Springs Avenue Historic District is listed on the National Register of Historic Places (since 1980). National Register listing primarily affects federal tax credits and federal-funded projects rather than imposing local design review, but the listing reflects the district's architectural significance and the community expectation that significant homes be preserved respectfully.
The East End Historic District is locally designated and requires City of Boise Historic Preservation Commission (HPC) review for any exterior modification visible from the public right-of-way — siding type and color, window replacement, roof material, porch modifications, additions, accessory structures, fencing. Iron Crest handles HPC submittals as part of standard project management. HPC review timelines: 4–8 weeks.
The Old Penitentiary Historic District is also locally designated with HPC review for visible exterior modifications. Same process as East End District.
EPA Lead Renovation, Repair and Painting (RRP) Program applies to virtually every East End project given the 1900–1928 construction wave. Iron Crest carries RRP certification and follows lead-safe work practices including HEPA containment, wet-paste paint scraping, lead-safe disposal, and final clearance testing where required.
Many East End and Warm Springs Avenue homes use geothermal heating from the City of Boise Geothermal District — heat exchanged from naturally hot underground water (174°F at the source). Geothermal heat affects HVAC scope: existing radiant baseboards, hydronic radiators, or fan-coil units must be properly integrated or replaced with appropriate systems. Iron Crest has experience with the Boise geothermal system specifically.
Asbestos testing required for pre-1980 demolition work — common locations include sheet flooring, mastic, popcorn ceilings, pipe insulation, vinyl asbestos tile, and sometimes roofing felt or building paper. East End homes pre-1925 often have plaster-and-lath walls with horsehair binder rather than later drywall — different demolition and repair practices apply.
Shower material specification for East End baths emphasizes period-correct aesthetic respecting Queen Anne / Tudor / Colonial Revival / Craftsman architectural brief, durable Schluter Kerdi waterproofing without exception, and the specialty preservation that 1930s hex tile, leaded-glass bath windows, and clawfoot tubs require.
Waterproofing — Schluter Kerdi membrane on every shower, no exceptions
Schluter Kerdi (orange polyethylene fabric bonded to cement-board substrate with thin-set mortar) on every East End shower we build. Lifetime Schluter manufacturer warranty when installed by certified installer (Iron Crest is certified). The Kerdi system far outperforms the vinyl-and-felt or cement-board-only methods that failed in countless East End District bathrooms over the decades — those failures are why we get called in to remediate hidden mold in 'remodeled in 2005' East End bungalow baths.
Wall tile — period-correct vocabulary on pre-1940 stock, modern on post-war
Pre-1940 vocabulary: 3×6 subway tile in matte finish with thin sanded grout joints to chair-rail height, pencil-liner cap rail, beveled or handmade-look ceramic (Pratt & Larson, Heath, Zia Tile) for period authenticity on East End District bungalow and Warm Springs Avenue Tudor scope. Honed marble or quartzite for premium primary applications on Warm Springs Avenue. Post-war and modern brief: large-format porcelain (12×24 or 24×48) in stone-look or solid color. Grout: epoxy or premium sanded with sealer.
Floor tile — small-format mosaic for grip and period read
Hex mosaic 1-inch or 2-inch tile in white-with-black-dot, cream, or solid black is required for shower floor — small grout joints provide slip resistance and small tiles allow proper slope to drain. Period-correct white-hex-with-black-dot reads beautifully in a Craftsman bath and is what original 1908 builders specified on East End District stock. Penny round in white or matte grey is another period-appropriate option. Floor slope minimum 1/4 inch per foot to drain location.
Drain — center round for curbed, Kerdi-Line linear for curbless
Standard center drain (round, 4-inch chrome strainer) for traditional curbed showers — period-correct on East End District bungalow and Warm Springs Avenue Tudor scope. Schluter Kerdi-Line linear drain for curbless designs, positioned along the wall opposite the shower head for single-direction floor slope. Linear drain costs $400–$1,200 above standard but is non-negotiable on curbless work. Period-style polished chrome or polished nickel grate finishes.
Glass enclosure — frameless 3/8" tempered, low-iron for premium scope
Frameless 3/8-inch tempered glass is the modern East End standard — minimal hardware, clean aesthetic, durable. Configuration options: single fixed panel (for walk-in alcoves), single fixed plus pivot door, or full enclosure depending on layout. Low-iron Starphire glass available as upgrade for the cleanest read on Warm Springs Avenue premium scope. Polished chrome, polished nickel, or oil-rubbed bronze hinges and clips chosen to match the rest of the bath finish family — chrome and nickel for East End District bungalow period work.
Plumbing fixtures — period-correct premium
Thermostatic shower valve (vs. pressure-balance) is the higher-quality choice and required for accessibility scope. Period-correct East End District bungalow brief: exposed valve assembly with cross-handle controls (House of Rohl Country Bath, Newport Brass Astor), single shower head on a 6-inch arm, polished chrome or polished nickel. Premium Warm Springs Avenue brief: House of Rohl Perrin & Rowe Edwardian, Waterworks Easton Classic, sometimes Sun Valley Bronze for hand-forged hardware. Modern brief: rain shower head ceiling-mount plus hand-shower on slide bar, single-handle thermostatic valve from Brizo Litze or Hansgrohe Talis.
Heated floor — radiant electric or hydronic geothermal integration
Schluter Ditra-Heat for typical East End District bungalow scope. Where home has City of Boise Geothermal Heating District connection on Warm Springs Avenue, sometimes hydronic in-floor heating integrated with the geothermal system rather than electric radiant. More efficient operation. Iron Crest coordinates with City system specifications.
Plaster-and-lath demolition and patching protocol (pre-1925 stock)
Pre-1925 East End District and Warm Springs Avenue walls are plaster-and-lath with horsehair binder. Different protocol than drywall — careful saw-cut for clean transitions, proper backing and patching where preserved-wall sections meet new substrate, plaster-keyed connection at shower-to-bath-wall transitions. Plaster repair: $35–$85 per square foot. EPA RRP throughout because pre-1978 trim is lead-painted.
Leaded-glass bath window preservation (Warm Springs Avenue specialty)
Some Warm Springs Avenue Queen Anne mansions and a small subset of premium East End District homes have leaded-glass bath windows or Tudor steel-sash leaded windows worth preserving as architectural feature. Specialty preservation through restoration glaziers — typically Boise-area specialty firms with the lead-came repair and steel-sash expertise these elements require. Cost: $1,500–$5,500 per leaded element depending on size and condition.
Geothermal radiant baseboard coordination at bath wall (Warm Springs Avenue)
Many Warm Springs Avenue homes use geothermal heating from the City of Boise Geothermal Heating District with existing radiant baseboards along bath walls. Shower scope at the bath wall must coordinate with existing baseboard hardware — temporary disconnect during demolition and rough-in, sometimes relocation to accommodate new shower footprint, reinstall after substrate and tile work. Built into Warm Springs Avenue shower pricing rather than added as surprise. Cost: $850–$3,500 incremental depending on system complexity.
East End shower demolition surfaces a recurring set of conditions tied to the pre-1928 housing stock, universal lead-paint, cast iron break-out demolition for bungalow alcove geometry, plaster-and-lath wall protocol, pre-1980 asbestos mortar beds, and geothermal interaction on Warm Springs Avenue. We pre-screen at the consultation walkthrough so the budget reflects them up front.
- •Cast iron tub demolition — break-out in place on bungalow alcove geometry Original cast iron clawfoot or alcove tubs in 1908–1928 East End District Craftsman bungalow baths weigh 300–400 pounds and almost always require break-out demolition in place with a chipping hammer because the tub can't be carried through an original 26-inch doorway. $200–$600 above standard tub removal. Universal scope on East End District original-tub conversions.
- •Plaster-and-lath wall demolition (pre-1925 East End District and Warm Springs Avenue) Heavier debris, wider dust footprint, different cuts than drywall. Adds 3–5 days to demolition. Plaster repair where preserved-wall sections meet new shower substrate: $35–$85 per square foot. Standard scope on every pre-1925 East End shower project.
- •Pre-1980 asbestos in mortar bed and substrate Pre-1980 ceramic-tile mortar beds and cement-board backing materials in East End baths frequently contain asbestos. Required pre-screen testing identifies. Licensed abatement before tile removal: $2,500–$6,500 depending on scope.
- •Universal pre-1978 lead-paint at bathroom walls and trim Universal in pre-1978 stock that comprises essentially the entire District. EPA RRP-certified work practices throughout — HEPA-only sanding, wet-paste paint scraping, lead-safe disposal. Built into every East End shower quote: $1,500–$5,500 for shower scope.
- •Galvanized supply lines that fail when disturbed (universal in pre-1960 stock) Existing galvanized supply lines feeding the original tub valve are 80–120 years old on East End District bungalow stock and often fail at fittings during demolition. Replacement of nearby supply runs to PEX or copper: $400–$1,500. Universal in pre-1940 East End District scope.
- •Cast iron drain replacement Universal in pre-1940 East End District homes. Original cast iron drains often show advanced deterioration. Replacement: $1,800–$6,500 for shower-specific scope.
- •Drain location requiring subfloor adjustment Tub drains are offset toward one wall; shower drains are typically centered (or linear along the back wall for curbless). Moving drain location requires subfloor cutting, drain rerouting through joist bays, and structural adjustment of original framing. $400–$1,500.
- •Failed waterproofing or hidden mold from original assemblies Universal on pre-1990 showers because original construction used felt-paper-only or vinyl-and-felt construction. Mold remediation when discovered: $1,500–$5,500. Patch repair of subfloor and joist damage: $400–$2,500.
- •Existing shower valve non-compliant with current anti-scald code Pre-1990s shower valves often lack anti-scald protection that current Idaho plumbing code requires. The existing valve must be replaced. $400–$1,200 above standard.
- •Outdated electrical including knob-and-tube GFCI required by code. East End District bungalow baths sometimes have original 60A or 100A service that's at capacity, sometimes knob-and-tube wiring on pre-1950 circuits. Bathroom rewire: $2,500–$5,500. Sometimes paired with broader service upgrade.
- •Inadequate ventilation Older baths often have no fan or undersized fan. New high-CFM humidity-sensing fan: $850–$1,800. Sometimes paired with new exterior vent termination on outside-District scope (interior-only for hood vent only triggers HPC review when penetration is on a District-located home).
- •Geothermal radiant baseboard coordination at bath wall (Warm Springs Avenue) Warm Springs Avenue homes served by the City of Boise Geothermal Heating District have existing radiant baseboards along bath walls. Shower scope at the bath wall requires temporary disconnect during demolition and rough-in, sometimes relocation, reinstall after substrate and tile: $850–$3,500 incremental depending on system complexity.
- •Leaded-glass bath window preservation (Warm Springs Avenue) Some Warm Springs Avenue Queen Anne mansions and a small subset of premium East End District homes have leaded-glass bath windows or Tudor steel-sash leaded windows. Specialty preservation through restoration glaziers: $1,500–$5,500 per element depending on size and condition.
Consultation and assessment (Week 1)
In-home walkthrough. Measurement of original bath and existing tub. Sub-area identification (East End District, Old Penitentiary District, Warm Springs Avenue, or outside-District). Identification of mechanical concerns (galvanized supply universal in pre-1960 stock, original 60A or 100A service common, knob-and-tube wiring on pre-1950 circuits). Discussion of shower shape, period-preservation priorities, and accessibility brief. Confirmation that scope is interior-only so no HPC review is triggered. Geothermal radiant baseboard documentation on Warm Springs Avenue properties.
Environmental testing (Weeks 1–2)
Asbestos pre-screen on suspect tile mortar bed and substrate. Lead testing assumed universal on pre-1978 trim. Results in 5–7 business days. On rare scope where exterior work is required (new hood vent through siding for example), HPC Certificate of Appropriateness submittal is sequenced in parallel.
Design and material selection (Week 2)
Tile selections calibrated to architectural brief (period hex-and-subway for East End District bungalow scope, period subway-and-hex for Warm Springs Avenue Tudor scope, modern large-format for post-war or contemporary brief), glass enclosure layout, fixture and valve selections, drain placement. Detailed line-item estimate with contingency called out.
Permitting and material ordering (Weeks 2–4)
City of Boise plumbing permit (and building permit when structural work is in scope). Interior-only shower scope is exempt from HPC review even when home is within East End or Old Penitentiary District boundary — no Certificate of Appropriateness needed. Period-correct fixtures from House of Rohl, Newport Brass, or specialty suppliers can run 4–6 weeks lead time; modern Brizo or Kohler typically 2–3 weeks.
Demolition (Week 4–5)
Tub or existing shower removal. Cast iron break-out demolition in place on East End District bungalow alcove geometry. Plaster-and-lath demolition protocol on pre-1925 wall sections. Asbestos abatement when pre-screen returned positive (by licensed contractor under Idaho DEQ containment). EPA RRP containment throughout. Subfloor inspection and repair when needed. Geothermal radiant baseboard temporary disconnect on Warm Springs Avenue scope.
Plumbing and electrical rough-in (Week 5)
Drain location adjustment, galvanized-to-PEX supply line replacement at the wet wall, new anti-scald thermostatic shower valve set. Electrical rough-in for heated floor, lighting, fan. Joist depression and reinforcement on curbless scope. City of Boise plumbing and electrical rough-in inspection.
Substrate and waterproofing (Week 5–6)
Cement board on shower walls. Schluter Kerdi membrane install across all wet areas (walls, floor, niche, bench if applicable). Pre-slope mortar bed. Curb construction if curbed design. Heated floor mat install where in scope. Plaster repair where preserved-wall sections meet new substrate on East End District and Warm Springs Avenue scope.
Tile install (Weeks 6–8)
Wall tile install with thin grout joints — period vocabulary (3×6 subway with pencil-liner cap) takes longer than modern large-format. Floor mosaic install on properly sloped substrate (1-inch or 2-inch hex in white-with-black-dot for period-correct East End District scope). Bench or accent tile. Grout install per Schluter spec. Sealer application after grout cure.
Glass enclosure, fixtures, and final inspection (Weeks 8–9)
Glass enclosure templated only after tile is set and grouted (5–10 business day fabrication, longer for low-iron Starphire upgrade on Warm Springs Avenue premium scope). Period-correct plumbing fixture install. Geothermal radiant baseboard reconnect on Warm Springs Avenue scope. Lighting trim. Final caulking. Final City of Boise plumbing and building inspections. Owner walkthrough. Punch resolution. 5-year Iron Crest workmanship warranty begins.
East End shower remodeling requires four specialty skill sets few generic contractors carry: Schluter Kerdi-certified waterproofing (lifetime manufacturer warranty), cast iron break-out demolition for East End District bungalow alcove geometry, plaster-and-lath protocol on pre-1925 stock with horsehair-binder plaster repair, and geothermal radiant baseboard coordination on Warm Springs Avenue scope.
- City of Boise Historic Preservation Commission — HPC review process, application requirements, design guidelines for East End and Old Penitentiary Historic Districts.
- Idaho State Historic Preservation Office (SHPO) — State-level historic preservation guidance and federal Section 106 review for federally-funded projects.
- City of Boise Geothermal Heating District — Information on the city geothermal heating system that serves Warm Springs Avenue and parts of East End — service connection, system specifications, billing.
- EPA Lead Renovation, Repair and Painting (RRP) Program — Required certification and work practices for renovation in pre-1978 homes — applies to virtually every East End project.
- Idaho DEQ Air Quality (Asbestos) — Testing and abatement guidance for pre-1980 East End homes.
- Idaho Division of Building Safety — Contractor Search — Verify any contractor's RCE license, bonding, and insurance through the official Idaho database.
- City of Boise Planning & Development Services — Building, electrical, plumbing, mechanical permits.
How much does an East End shower remodel cost?
$22,000–$35,000 for secondary bath shower; $28,000–$45,000 for 1908 East End District bungalow cast iron tub-to-shower conversion with period-correct hex-and-subway vocabulary; $32,000–$48,000 for Warm Springs Avenue preserved-1930s-hex-tile walk-in; $35,000–$55,000 for clawfoot tub preservation with walk-in addition; $42,000–$62,000 for Warm Springs Avenue premium spa shower with period details and geothermal coordination.
Does Historic Preservation Commission review apply to my shower remodel?
No — interior-only shower scope is exempt from HPC review even when your home is squarely inside the East End Historic District or Old Penitentiary Historic District boundary. The shower project proceeds at standard City of Boise speed (2–4 weeks plumbing permit, 3–5 weeks building permit when structural work is in scope) without the 4–8 week HPC overlay that exterior scope triggers. HPC only enters the picture if your scope crosses an exterior wall — a new exterior penetration for a relocated drain, a window enlarged for natural light at the shower wall, an exterior hood vent. Iron Crest tells you upfront which scope items would trigger HPC review and sequences submittal accordingly when they do.
Will Schluter Kerdi waterproofing be used?
Yes, on every shower without exception. Schluter Kerdi (orange polyethylene fabric bonded to cement-board substrate with thin-set mortar) creates a fully waterproof barrier behind the tile. Lifetime Schluter manufacturer warranty when installed by certified installer (Iron Crest is certified). The Kerdi system far outperforms the vinyl-and-felt or cement-board-only methods that failed in countless East End District bathrooms over the decades — those failures are why we get called in to remediate hidden mold in 'remodeled in 2005' East End bungalow baths. For curbless designs, we use Schluter Kerdi-Line linear drains.
Can I keep the original cast iron clawfoot tub?
Yes — preservation is encouraged where the tub is in good condition. Iron Crest can refinish the interior surface, clean and repaint the exterior if painted, replace claw feet hardware, and add a new freestanding tub filler (period-correct from House of Rohl, Waterworks, or Sun Valley Bronze). Result is a centerpiece period-correct primary bath element. Combined with new walk-in shower in adjacent space, the scope often involves footprint expansion absorbing a small adjacent closet or hallway corner on tight East End District bungalow geometry.
What tile patterns are appropriate for East End baths?
Period-correct East End District bungalow vocabulary: 1-inch or 2-inch hex mosaic floor tile in white-with-black-dot, cream, or solid black; 3×6 subway tile in matte handmade-look ceramic for shower walls to chair-rail height; pencil-liner cap rail. Penny round in white or matte grey is another period-correct option. Warm Springs Avenue Tudor or Colonial Revival: period subway-and-hex vocabulary, sometimes encaustic-pattern accent tile for entry vestibule scope. Pratt & Larson, Heath, and Zia Tile carry period-correct ceramic. Modern brief: large-format porcelain (12×24 or 24×48) in stone-look or solid color.
What fixtures evoke the period without being literal reproductions?
Period-correct East End District bungalow brief: exposed valve assembly with cross-handle controls (House of Rohl Country Bath, Newport Brass Astor), polished chrome or polished nickel finishes. Premium Warm Springs Avenue brief: House of Rohl Perrin & Rowe Edwardian, Waterworks Easton Classic, sometimes Sun Valley Bronze for hand-forged hardware. All evoke turn-of-century aesthetic with modern thermostatic-valve function. Iron Crest specifies period-correct fixtures throughout calibrated to architectural brief and budget.
How long does an East End shower remodel take?
4–6 weeks for secondary bath shower. 5–7 weeks for 1908 East End District bungalow cast iron tub-to-shower conversion (plaster-and-lath demolition and cast iron break-out add 3–5 days vs. drywall homes). 6–9 weeks for Warm Springs Avenue preserved-1930s-hex-tile walk-in (careful hand-tool demolition extends timeline). 6–8 weeks for clawfoot preservation with walk-in addition. 6–9 weeks for Warm Springs Avenue premium spa shower with geothermal coordination.
What about heated floors with geothermal heat?
Where home has City of Boise Geothermal Heating District connection on Warm Springs Avenue, sometimes hydronic in-floor heating is integrated with the geothermal system rather than electric radiant. More efficient operation. Iron Crest coordinates with City system specifications. Standard Schluter Ditra-Heat or NuHeat electric radiant for East End District bungalow scope where geothermal isn't available.
Will plaster walls be a problem during demolition?
Iron Crest carries specific plaster-and-lath demolition protocol on every pre-1925 East End District and Warm Springs Avenue project. Different practices than drywall — careful saw-cut for clean transitions, proper backing and patching where preserved-wall sections meet new substrate, plaster-keyed connection at shower-to-bath-wall transitions. Plaster repair: $35–$85 per square foot. Standard scope on every East End District shower project, not a surprise change order.
Can you preserve original 1930s hex tile floor in my Tudor bath?
Sometimes — and when the original tile is intact and in good condition, this is one of the most rewarding scopes we run on Warm Springs Avenue Tudor Revival and Colonial Revival baths. Original 1930s hex mosaic floor tile can be preserved when the shower work is contained to the tub alcove only. Requires careful demolition with hand tools rather than power demolition at the tile-meets-tub boundary, and accepting that occasional tile replacement may be needed where new construction abuts old. We discuss preservation goals at consultation and develop the demolition plan accordingly. Worth a 1–2 week timeline extension for the period continuity it preserves.
What about leaded-glass bath windows on Warm Springs Avenue?
Some Warm Springs Avenue Queen Anne mansions and a small subset of premium East End District Tudor Revival baths have leaded-glass windows or Tudor steel-sash leaded windows worth preserving as architectural feature. We coordinate specialty preservation through restoration glaziers — typically Boise-area specialty firms with the lead-came repair and steel-sash expertise these elements require. Cost: $1,500–$5,500 per leaded element depending on size and condition.
How do you handle the 100-year-old plumbing in an East End shower remodel?
We assume galvanized supply lines and original cast iron drains in any pre-1960 East End District bath and budget for replacement of supply runs feeding the shower valve from the main shutoff or branch tap to the new valve. New supply: PEX or copper. New drain: PVC from new shower drain back to the existing main drain stack (or replacement of the drain stack if it shows advanced deterioration on East End District bungalow stock). Standard scope on our East End shower work, not a surprise change order.
Ready to start your East End / Warm Springs shower remodeling project?
Free in-home consultation, honest contingency-based budgeting, and the experience these older Boise homes require. Iron Crest Remodel — Idaho RCE #6681702, EPA RRP lead-safe certified, $2M general liability, 5-year workmanship warranty.
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