Seattle, WA · King County
Window Replacement in Seattle, WA: Cost & Permits
What window replacement actually costs in Seattle, whether you need a permit, which inspections apply, and how long the job takes.
Model reviewed August 2026
Typical local cost
$20,700
$10,200 – $46,200
per window installed
$900 – $2,600
Permit fee
$160 – $745
Modeled allowance
vs national
+36%
local labor & materials
Looking for pricing detail? The full window replacement cost breakdown for Seattle covers cost by size and material, the local cost model and nearby markets.
Do you need a permit for window replacement in Seattle, WA?
Yes
Yes — a permit is required for window replacement in Seattle, WA. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
SDCI review timelines, seismic detailing and energy-code requirements add meaningful cost and schedule to structural and envelope work.
Cost breakdown in Seattle
| Low endSimple scope, competitive bid | $10,200 |
|---|---|
| TypicalMost homeowners land here | $20,700 |
| High endComplex access, premium materials | $46,200 |
| per window installed | $900 – $2,600 |
| Permit fee | Estimated allowance $160–$745Modeled from comparable fee schedules — not an official quoted fee. |
| Permit authority | City of Seattle building departmentModeled estimate |
| Timeline | 1-3 days of installation, 3-8 weeks including product lead time and permitting |
Math: national median $15,200 × 1.362 = $20,700 in Seattle — +36% versus the national model. The multiplier blends local labor and material costs with this project's labor share, so it is not the same as the city's overall cost index (1.26). Permit fees use a 1.35 local multiplier. Estimates, not quotes.
What drives your price here
- Number and size of openings
- Impact-rated versus standard glass
- Frame material: vinyl, aluminum or fiberglass
- Design pressure required for your wind zone
- Stucco, block or frame wall repair around the opening
Permit process and inspections
| Permit required | Yes |
|---|---|
| Who pulls it | Licensed contractor |
| Inspections | Window buck / installation inspection, Final building inspection |
| Documents | Building permit application, Window schedule with sizes and design pressures, Installation details and fastener schedule |
| Apply | Seattle permit portal |
Frequently asked questions
How much does window replacement cost per window?
Most U.S. homeowners pay about $650 to $1,900 per window installed, depending on size, frame material and glass. A typical whole-house project of 10 to 20 windows lands around $7,500 to $34,000.
Is it cheaper to replace all windows at once?
Usually, yes. Contractors spread setup, travel and crew time across more openings, and manufacturers often discount larger orders. Doing it in phases works, but expect a higher per-window price.
Vinyl vs. fiberglass windows: which is better?
Vinyl is the most common and lowest-cost frame. Fiberglass costs more but expands less with temperature changes, holds paint and suits dark colors and large openings. Both outlast older aluminum frames in most climates.
Do replacement windows need a permit?
Many U.S. jurisdictions require a permit when the opening size, egress or structure changes, and some require one for any replacement. In high-wind coastal areas, product approvals and design-pressure ratings are part of the review.
Windows costs in nearby cities
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.