Estimate your 2026 Seattle bathroom remodel — select bathroom type, scope, and shower or tub configuration to get an itemized material and labor breakdown, shown as a range of 15% below to 15% above the point total.
This is the tool version of our How Much Does a Bathroom Remodel Cost in Seattle? (2026 Guide) 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
Shower wall tile is priced under Tile Work.
Optional upgrades for your bathroom remodel
Radiant heat under new floor tile
Updated vanity and recessed lighting
New exhaust fan
Relocate plumbing for layout changes
Sliding glass door for a 60 in. shower or tub opening
Wall-mounted seat with blocking in the wall
Handheld shower, slide bar and hose
Installed with blocking in the wall
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 the code work a wet room brings, such as GFCI-protected outlets, ventilation and waterproofing behind shower tile. The calculator prices a ventilation fan as an optional line, $330 installed, and adds Seattle's building permit on standard and full-gut scopes, priced from the 2026 SDCI fee schedule on the job's value (about $810 on a 40 sq ft tub-to-shower remodel). A cosmetic refresh carries none unless a tub or shower is replaced or plumbing is moved, which adds the county plumbing permit ($137 plus $27 a fixture), or heated floors or new lighting are wired in, which adds Seattle's electrical permit ($110). It does not add separate lines for electrical code upgrades, lead paint testing on a home built before 1978, or repairs to water damage found behind the walls. Those are scoped at the walkthrough.
On a 40 sq ft full bath the calculator's time estimate is 4 working days for a cosmetic refresh, 11 for a standard remodel and 20 for a full gut. It grows with the square root of the room's size, and it is never shorter than the job's labor hours spread over a two-person crew, so a cosmetic update with a new tiled shower reads about a week and a half. A cosmetic update is short enough to live around if you have another bathroom. Standard and full gut remodels take the bathroom offline, and full guts often uncover hidden moisture damage or outdated plumbing. If you have only one bathroom, plan for alternative arrangements during renovation. The time estimate counts working days only; permit review is not part of it.
Our calculator provides planning-level estimates, shown as a range of 15% below to 15% above the point total. Bathrooms are prone to hidden issues (water damage, mold behind walls, outdated plumbing) that can affect final pricing. The calculator adds no contingency line, so hold 10-15% on top for a typical scope and about 20% for a home built before 1978, where asbestos, lead paint or knob-and-tube wiring can surface. 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. This bathroom renovation calculator prices from Kolmo's own material catalog and labor rates, 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.
Three Seattle bathroom scopes as the calculator prices them. Each figure is for the room size named; larger rooms cost more.
A 30 sq ft powder room: new budget vanity, new light fixtures with their electrical permit, paint and hardware. No fixture relocations and no tile work.
A 40 sq ft bath: tub converted to a walk-in shower, tiled floor and shower walls, mid-range vanity, new exhaust fan. Permit included.
A 100 sq ft primary bath gutted to the studs: freestanding tub, premium vanity, tile on every wall to the ceiling, heated floors, new lighting and exhaust fan. Permit included; structural changes and a separate glass shower are quoted separately.
Yes. Standard and full-gut scopes include Seattle's building permit in the total, priced from the 2026 SDCI fee schedule on the job's value: about $810 on a 40 sq ft tub-to-shower remodel. A cosmetic update carries none unless a tub or shower is replaced or plumbing is moved, which adds the county plumbing permit ($137 plus $27 a fixture), or heated floors or new lighting are wired in, which adds Seattle's electrical permit ($110). 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 the expected fee and timeline at your address.
Converting a tub alcove to a walk-in shower means pulling the tub, a new waterproof shower pan and drain, and a new valve. On the calculator's default 60 sq ft bath that part adds about $4,300. The new shower also needs walls: tiled walls add the shower tile under Tile Work, taking the estimate from about $11,200 to about $19,800, and solid-surface wall panels instead take it to about $17,200. A glass door, a fold-down seat, grab bars and a hand shower are their own options.
Cosmetic scope means the rest of the room stays as it is: paint, light fixtures, faucets, mirror and hardware, with a new vanity or a toilet swap in the same place. A new tub or shower, tile, or moved plumbing is priced as its own line on top, with a plumbing permit. Choose standard when the room's finishes are torn out and replaced on the same layout, and full gut when it goes to the studs.
The calculator adds no contingency line, so add one on top when budgeting: about 10-15% on a typical scope, and about 20% for homes built before 1978, where asbestos abatement, lead-paint encapsulation, or galvanized or knob-and-tube replacement can turn up during demo.
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
Seattle bathroom remodels run $3.7K–$6.5K cosmetic, $13.8K–$18.6K standard, $25.2K–$49.4K+ full gut in 2026. Real size-by-scope ranges, permit fees, ROI, and a free calculator.
From the blog
A tub-to-shower conversion in Seattle runs $6,000–$8,150 on its own, $12,600–$17,000 inside a standard remodel, $29,300–$39,700 as a full gut with a walk-in shower. 2026 line items, unit prices and permits.
Other calculators
Kitchen, basement, flooring, windows, deck, painting, ADA, and more — same Seattle 2026 pricing.
Hiring Kolmo
License and insurance records, Google reviews, finished projects and how a quote works.
