How Much Does Window Replacement Cost in Seattle & the Eastside? 2026 Price Guide

The short answer

In 2026, professionally installed replacement windows in the Seattle area run from roughly $350 per window for a basic vinyl insert to $2,750 or more for a large fiberglass or wood-clad full-frame unit. Most homeowners replacing a whole house of 15–20 windows land somewhere between $10,000 and $30,000, with the material you choose and the condition of the existing openings doing most of the work in that spread. Local cost surveys put the typical Seattle whole-house project in the mid-teens.

2026 window replacement cost by material

Installed, per window, these are the ranges we see most often on Eastside and Seattle homes:

• Vinyl: about $350–$1,200. The best value for most homes; modern vinyl is energy efficient and needs no painting.
• Fiberglass: about $900–$2,200. Stronger and more stable than vinyl, with slimmer frames and paintable surfaces; a good fit for larger openings.
• Wood and wood-clad: about $1,100–$2,750+. The choice for character homes and historic districts; aluminum- or fiberglass-clad exteriors cut the maintenance that bare wood needs in our climate.
• Aluminum: usually only in commercial or mid-century-modern applications today; it conducts heat and rarely meets Washington’s energy code without a thermal break.

Specialty shapes, picture windows over about 40 square feet, bay and bow windows, and patio doors all cost more than a standard double-hung or slider.

Insert vs. full-frame: the price difference nobody explains

An insert (pocket) replacement keeps your existing frame, trim and siding intact and installs a new window inside it. It is faster, less disruptive, and typically 15–20% cheaper. It is the right approach when your frames are square, dry and solid.

A full-frame replacement removes the whole window down to the rough opening and rebuilds it with new flashing, a sill pan, a new frame and new trim. It costs more because it takes more labor and touches your siding, but it is the only honest fix when there is rot, a soft sill, water staining below the window, or a fogged 1970s–80s aluminum frame. In Western Washington we recommend full-frame on a large share of the older homes we open up, because the damage behind the old window is usually worse than it looks from the inside.

What else moves the price in Seattle and the Eastside

• Hidden rot and framing repair. The most common surprise on local window jobs. We photograph what we find and price repairs from a fixed rate sheet so there is no open-ended “time and materials.”
• Second-story and hard-to-reach openings. Scaffolding or lift time adds to labor.
• Glass package. Low-E coatings and argon fill are standard now; triple-pane and laminated acoustic glass (popular near I-405 and SR-520) add cost.
• Exterior finish work. Matching existing siding and trim, or combining the window project with a siding replacement, changes the scope.
• Sales tax. Seattle’s combined rate is over 10%, so compare quotes with tax included.

Do you need a permit to replace windows in Washington?

For like-for-like replacement in existing openings, Seattle and most King County cities do not require a building permit. You do need one when you enlarge or add an opening, change a bedroom egress window, or alter structural framing. Whether or not a permit is pulled, new windows must meet the Washington State Energy Code, which calls for a U-factor of 0.30 or better in our climate zone. Our Washington permit guide explains how Seattle and Eastside cities differ.

Rebates and tax credits

Puget Sound Energy has periodically offered rebates for qualifying high-efficiency windows, and federal energy-efficiency tax credits have applied to ENERGY STAR-certified windows in recent years. Programs and amounts change, so we check what is current when we quote and give you the manufacturer documentation needed to claim anything you qualify for.

Is window replacement worth it?

Nationally, vinyl window replacement recovers a large share of its cost at resale and is one of the better-returning exterior projects. The bigger payoff in the Seattle area is comfort: drafty single-pane or failed double-pane windows are the main reason rooms feel cold from October to April, and new windows noticeably quiet traffic noise. If you are also weighing siding, exterior paint or insulation, bundling them into one project saves on labor and scaffolding.

How Blue Lake prices a window project

We measure every opening in person, probe sills and framing for rot, and give you a fixed, itemized price that separates windows, installation and any repair work. We handle any permit under our Washington contractor license (BLUELLC760C3), coordinate siding and trim, and warranty the installation. See our window replacement page for recent projects, or request a free in-home consultation anywhere in Bellevue, Seattle and the greater Eastside.