Bathroom Remodeling contractor —
Seattle & Puget Sound.
Bathrooms fail when waterproofing is treated as an afterthought. We build to Schluter-system standards: hot-mopped pans, sealed niches, and continuous moisture barriers behind every tile.
Bathrooms fail when waterproofing is treated as an afterthought. The single biggest cause of bathroom callbacks — across the entire industry — is a missing or improperly installed waterproof membrane behind tile. We build to Schluter-system or equivalent standards on every bath, primary or secondary.
Most Seattle baths benefit from three changes: curbless or low-curb showers (ageing-in-place and resale), heated floors (PNW climate), and a properly sized exhaust fan with humidistat (mold prevention). Beyond that, scope is dictated by layout and how long you plan to own.
What we build
SCOPE- 01Schluter waterproofing system
- 02Curbless / wet-room layouts
- 03Custom tile + niches
- 04Heated floors
- 05Steam shower options
- 06Smart-fixture rough-in
Phased process
PROCESS- 01
Design & layout
Measured drawings, fixture selections, tile dry-lay layout, niche placement and grout-joint planning.
- 02
Demo to studs
Remove tile, drywall, subfloor where soft, and old fixtures. Inspect framing for rot and replumb if galvanized.
- 03
Rough-in MEP
Move drains, valves, vent stacks, and lighting. Add bathroom-rated dimmer, exhaust fan with humidistat, and dedicated GFCI circuits.
- 04
Waterproofing
Hot-mopped or sheet-membrane shower pan, Schluter Kerdi / Wedi panels on shower walls, sealed niches, sloped curb if used.
- 05
Tile & stone
Dry-lay layout, large-format substrate flatness check, set tile, epoxy grout in wet areas, hone and seal stone.
- 06
Fixtures & finish
Vanity, faucets, frameless shower glass, mirrors, and accessories. Final caulking with mildew-resistant silicone.
- 07
Inspection & handover
Final building inspection, fan flow verification, leak check, warranty package.
Spec sheet
SPEC- +Schluter Kerdi membrane or Wedi panel waterproofing (10-yr manufacturer warranty)
- +Linear or center drain with sloped pan, curbless when framing allows
- +Large-format porcelain or natural stone with epoxy grout in wet areas
- +Frameless 3/8" tempered shower glass with low-iron option
- +Thermostatic + volume control shower valve (Hansgrohe, Kohler, Brizo)
- +Heated floor with WiFi-enabled thermostat, in-floor radiant under tile
- +Panasonic WhisperGreen / Broom AER fan with humidistat, vented to exterior
Cost drivers
COST- Curbless / wet-room conversion+$4K–$10K for framing drop, full waterproofing, and linear drain
- Tile selection (porcelain → marble → handmade)$8/sf to $60+/sf installed
- Moving the toilet or shower drain+$2K–$6K depending on floor structure (slab vs joist)
- Heated floor+$1,500–$4,000 for material and thermostat
- Frameless glass enclosure+$1,800–$5,500 vs framed shower door
Codes & permits
COMPLIANCE- IRC P2708 (shower enclosures)
Minimum 30" × 30" interior dimension; 1,300 sq in finished area; 70" minimum height above drain.
- WSEC 2021 ventilation
Exhaust fan sized per ASHRAE 62.2 with continuous or humidistat-controlled operation; vent to exterior, not the attic.
- NEC 210.8(A)(1)
All bath receptacles GFCI protected. Lighting on dedicated dimmable circuit; no luminaire within shower zone unless wet-listed.
- TCNA / ANSI A118.10
Industry waterproofing standard. Schluter Kerdi and Wedi are pre-engineered to meet it; mortar-bed installations require strict ASTM testing.
Is bathroom remodeling the right call?
- →Bath shows visible water damage at floor, base, or ceiling below
- →Original tile is 1980s/1990s on cement board — high failure risk
- →Planning to age in place (curbless shower, grab-bar blocking, lever fixtures)
- →Selling within 2–3 years; bath is the second-highest ROI room after kitchen
Bath questions
FAQQ.01
How much does a bathroom remodel cost in Seattle?
Secondary bath: $28K–$55K. Primary bath: $55K–$95K. Luxury primary with steam, heated floor, frameless glass and stone: $95K–$185K.Q.02
How long are we without the bathroom?
5–8 weeks for a typical bath, 8–12 for a primary with stone and curbless layout. If it is your only bath, we sequence trades to minimize unusable days.Q.03
Do I need a permit?
Yes for any plumbing or electrical rough-in changes, framing alteration, or moving drains. Same-fixture-location refresh with no MEP changes generally does not require one.Q.04
Is a curbless shower worth it?
Yes, both for resale and aging-in-place. Adds 4-10K to cost but transforms how the bath functions and looks. Requires either dropped framing or slab modification.Q.05
How do you prevent mold and mildew?
Three controls: proper waterproof membrane behind tile, humidistat-controlled exhaust fan sized to the room, and epoxy grout in wet areas. The fan is the single biggest variable people get wrong.
Official resources & sources
- Source ↗WA WAC 246-290 — Plumbing & water supply
- Source ↗TCNA Tile Installation Standards
- Source ↗WSEC 2021 Residential Energy CodeEnvelope, HVAC, hot-water and air-sealing requirements
- Source ↗WA HB 1110 — Middle housing lawStatewide middle-housing zoning preemption
- Source ↗WA HB 1337 — ADU statewide rulesTwo-ADU baseline, no owner occupancy, parking limits
- Source ↗WA Dept. of Commerce — ADU resources
- Source ↗WA L&I contractor license lookupVerify Golden State ADU Builders Inc · GOLDESA747LZ
- Source ↗Washington State Building Code CouncilStatewide adopted codes (IRC, IBC, WSEC)
Ready to scope your bath project?
Send a paragraph and the address. A licensed PM replies within one business day with next steps.
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