Estimate your 2026 Seattle bathroom remodel — select bathroom type, scope, and shower or tub configuration to get an itemized material and labor breakdown typically within 10-15% of a quoted project.
This is the tool version of our Seattle ADA Bathroom Retrofit Cost Guide 2026: Accessibility & Value guide, which walks through neighborhood-specific issues (galvanized plumbing in Wallingford and Fremont, older electrical, moisture handling in Seattle's wet season), ROI expectations, and hidden-cost traps. Read the guide for context; use the calculator below for a number.
Specify your bathroom type, size, and remodel scope
Typical range: 20–300 sq ft
Choose your shower/tub, vanity, and tile options
Optional upgrades for your bathroom remodel
Radiant floor heating system (~$2,000)
Updated vanity and recessed lighting (~$1,100)
New exhaust fan with humidity sensor (~$650)
Relocate plumbing for layout changes (~$4,200)
Configure your project and click Calculate
Enter your project details to get started
Scope-based bathroom remodel estimates for Seattle homeowners
Bathroom renovations range from simple fixture swaps to complete gut renovations. Our calculator uses a scope-tier approach combined with specific component selections (shower/tub, vanity, tile work) to generate realistic planning estimates. We account for bathroom type (half bath, full bath, primary bath, or accessible) since each has different plumbing complexity and fixture requirements.
Estimates include base scope costs, shower/tub configuration (keeping existing, conversions, or replacements), vanity selection, tile work at various coverage levels, and optional add-ons like heated floors, upgraded lighting, ventilation, and plumbing relocation. The calculator applies bathroom-type multipliers: half baths cost less due to simpler plumbing, while primary baths and accessible baths cost more due to size and specialized requirements.
Seattle bathroom remodel costs reflect local labor rates and code requirements. Washington State requires GFCI outlets within 6 feet of water sources, adequate ventilation (50 CFM minimum for bathrooms), and waterproof membrane systems behind shower tile. Homes built before 1978 may require lead paint testing. Our estimates include these code-compliance costs that cheaper national calculators often miss.
Cosmetic bathroom updates (3-7 days) allow continued use of other bathrooms. Standard remodels (10-18 days) require the bathroom to be offline. Full gut renovations (20-30+ days) often uncover hidden moisture damage or outdated plumbing. If you have only one bathroom, plan for alternative arrangements during renovation. Our timelines include cure times for waterproofing and tile mortar, which are critical in Seattle's humid climate.
Our calculator provides planning-level estimates typically within 15-20% of final costs. Bathrooms are prone to hidden issues (water damage, mold behind walls, outdated plumbing) that can affect final pricing. We recommend a 15% contingency budget for standard remodels and 20% for full guts. Contact us for a free in-home assessment for precise pricing.
Half baths (powder rooms) have just a toilet and sink — simplest plumbing. Full baths add a shower or tub. Primary baths are typically larger with upgraded fixtures, double vanities, and separate shower and tub. Accessible baths include ADA-compliant features like grab bars, wider clearances, and barrier-free showers. Each type has different cost multipliers reflecting complexity.
Kolmo LLC, established 2025, is a licensed, bonded and insured Washington general contractor (License #KOLMOL*753JS) working across Seattle and King County, and every rate in this tool reflects Seattle-area labor and supplier pricing. This bathroom renovation calculator prices from Kolmo's own material catalog and labor rates — current Seattle-area supplier pricing and our bid history, not national averages. Every estimate returns an itemized breakdown of materials and labor, and the line items reconcile to the total so you can check the arithmetic yourself, and the cost of every option you switch on appears as its own line. Treat the result as a planning estimate rather than a quote: the final price is set after a walkthrough of the actual conditions, which is free and carries no obligation.
The calculator prices these three Seattle scope bands using current labor rates and supplier pricing cross-referenced against our own bid history.
New vanity, toilet swap, paint, light fixture, mirror. No fixture relocations, no tile work beyond an accent wall.
Tile walk-in shower with new pan and drain, semi-custom vanity, new fixtures, tile floor, ventilation upgrade. Most common Seattle full-bath scope.
Gut to studs, heated floors, custom vanity, freestanding tub, separate shower, frameless glass, smart fixtures. Often pushes higher with structural changes.
No — the calculator returns material and labor costs only. Bathroom remodels that alter plumbing, electrical, or ventilation require Subject-to-Field-Inspection (STFI) permits in Seattle. Use our Permit Assessment tool at /permits for expected permit cost and timeline.
Converting a tub alcove to a curbless walk-in shower requires a waterproof pan (Schluter Kerdi or hot mop), a relocated drain, full-height tile instead of a fiberglass surround, and often framing changes. On a Seattle mid-range full bath this scope swap typically moves the estimate from about $12,000 to $22,000-$28,000.
Cosmetic scope covers surface-level refreshes that don't touch plumbing rough-ins: new vanity, paint, light fixtures, mirror, a toilet swap in the same location, and sometimes new tile over existing. As soon as you move a fixture, widen a shower, or touch rough plumbing you move into standard or full-gut scope.
For homes built before 1978 we recommend adding a 12% contingency for asbestos abatement, lead-paint encapsulation, or galvanized/knob-and-tube replacement discovered during demo. The calculator returns a tight material and labor estimate; add the contingency on top when budgeting.
The calculator returns a single total for the configured scope. For phased work — for example a cosmetic refresh now and a full gut in 2028 — run the calculator twice at each scope level and subtract, or contact us directly and we'll price a phased plan against your timeline.
Continue the planning once you have a number.
Read the guide
Explore Seattle ADA bathroom retrofit costs in 2026. Get expert insights on design, permits, and expenses (ranging $25K-$90K+) to create an accessible, safe home.
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