Estimate your 2026 Seattle ADA accessibility modifications — grab bars, walk-in showers, wider doorways, wheelchair ramps, stair lifts, and full accessible-bath conversions. The calculator specs tested-to-code hardware.
For deeper context read our Seattle Light Commercial Construction: Your Business Partner. If your primary scope is a bathroom remodel with ADA features, also check the bathroom remodel calculator with 'ADA-accessible' configuration. A whole-bathroom remodel is priced more completely there, because that mode includes the base remodel, vanity and tile.
Define the scope and current condition of the project
Select the modifications needed for your project
Install ADA-compliant grab bars in bathroom
Barrier-free shower with zero-threshold entry
Widen doorframes to 36" for wheelchair access
Exterior ramp with handrails
Slip-resistant flooring throughout
Replace knobs with lever-style handles
ADA comfort-height toilet installation
ADA-compliant sink with wheelchair clearance
Lower counter sections with pull-out shelves
Motorized chair lift for stairs
Configure your project and click Calculate
Enter your project details to get started
Home accessibility modification estimates for Seattle homeowners
Unlike our other calculators that estimate whole-project costs, the ADA calculator prices individual accessibility modifications. You select which upgrades you need — grab bars, walk-in showers, wider doorways, ramps, non-slip flooring, lever handles, raised toilets, roll-under sinks, accessible counters, or stair lifts — and the calculator totals them, adjusting labor for your home's current condition.
Each modification is priced as a material line and a labor line. Wider doorways include reframing, trim and switch relocation; walk-in shower conversions include curb removal, waterproofing and tile; ramps include handrails. Labor rises with your home's current condition, 25% at moderate and 60% at major, so one widened doorway comes to $1,896 at minor condition and $2,426 at major, its permit included. Small jobs are raised to a $1,500 job minimum, so a grab-bar installation on its own comes to $1,500 at any condition. Seattle's building permit, priced from the 2026 SDCI fee schedule on the job's value, is added when a structural modification (a walk-in shower, wider doorways, a ramp or a roll-under sink) is selected, and a $250 permit line for a stair lift.
Whether a modification needs a permit depends on the work and the jurisdiction; the calculator adds Seattle's permit fee whenever a structural modification is selected and a permit line for a stair lift, and the actual fee is set when the permit is issued. Many accessibility modifications may qualify for tax deductions (IRS Medical Expense Deduction) or state programs like the Washington State Aging and Long-Term Support Administration (ALTSA) grants. Kolmo is SEDBE-certified, which may provide advantages for publicly-funded accessibility projects.
Simple modifications like grab bars and lever handles can be completed in a single day. Structural changes like wider doorways (1-2 days each), walk-in showers (5-7 days), and ramps (2-3 days) take longer. Stair lifts typically require 1-2 days for installation. We recommend prioritizing modifications based on immediate safety needs, then scheduling additional upgrades in phases to minimize disruption.
Yes, many ADA modifications qualify as medical expenses deductible on federal taxes (IRS Publication 502) if they exceed 7.5% of adjusted gross income. Modifications that increase home value (like a stair lift) may be partially deductible. Washington State also offers programs through ALTSA and the Department of Veterans Affairs for qualifying residents. Consult your tax professional for specific guidance.
No. Our calculator lets you select individual modifications and see costs for each. Many homeowners start with high-priority safety items (grab bars, non-slip flooring, lever handles) and plan larger structural changes (wider doorways, walk-in shower, ramp) for a later phase. Doing multiple modifications together can save on labor costs due to reduced mobilization and setup time — our whole-home scope applies a 10% discount for this reason.
Kolmo LLC, established 2025, is a licensed, bonded and insured Washington general contractor (License #KOLMOL*753JS) working across Seattle and King County. This accessibility modification 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.
Pricing bands from this calculator, minor to major existing condition, permits included. The "common package" is the typical aging-in-place bathroom conversion we see most often.
ADA-compliant grab bars into framing or blocking, lever-style door handles throughout. Fast and high-impact. On its own this job falls under the $1,500 job minimum, so that is its price at any existing condition.
Grab bars + walk-in shower + raised toilet + one widened doorway. The standard aging-in-place bundle.
Curbless roll-in shower, wider doorway, roll-under sink, lowered counters, non-slip tile, full turning radius. Often a full bath remodel.
Yes — widening a doorway from 28 in to ADA-standard 36 in clear opening involves header reframing, drywall patch, new jamb and casing, and repaint. The calculator prices $1,200 per doorway at minor existing condition and $1,710 at major, plus one Seattle building permit per project, priced from the 2026 SDCI fee schedule on the job's value (about $700 with one doorway). It does not price load-bearing walls; an engineered header is quoted after a site visit.
Yes — specs ADA-compliant grab bars rated for 250-500 lb static load, installed into framing or 3/4-in plywood backing. Surface-mount bars with adhesive or drywall anchors are NOT ADA-compliant and aren't priced. Installation requires opening drywall if blocking wasn't installed originally — factored in.
A roll-in shower is a full bathroom scope change — sloped subfloor pan, linear drain, waterproof membrane, usually doubling the shower footprint for turning radius. The calculator's walk-in shower line prices at $6,570-$8,520 including Seattle's building permit (SDCI's 2026 fee on the job's value, about $850-$910), minor to major existing condition. If doing a broader bath remodel at the same time, run the Bathroom Calculator in 'ADA-accessible' mode instead — that mode includes the base remodel, vanity and tile.
Yes — the calculator adds Seattle's building permit to every ramp, priced from the 2026 SDCI fee schedule on the ramp's value (about $750 on a 20 ft ramp), because permanent exterior ramps require SDCI approval in Seattle (they attach to the home with footings). Portable / modular aluminum ramps generally don't need a permit; ask us to price one without it. Use our Permit Assessment tool at /permits for custom configurations.
Yes — the 'common package' combines grab bars, a walk-in shower, a raised toilet, and one widened doorway ($8,850-$11,700 in this calculator). You can layer additional items. If planning 5-10 years ahead, install blocking for future grab bars during any current bath or wall work, so the bars go in later without opening the wall.
Continue the planning once you have a number.
Read the guide
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Often combined
ADA features bundled into a full bath remodel is usually cheaper than pricing mods standalone.
Permits
Permanent ramps, load-bearing doorway widenings, and structural bath changes all need SDCI review.
