Windows and Doors in Puget Sound: Costs, Options and How to Hire
Replacement windows in the Seattle area cost $900 to $1,600 each installed in vinyl, $1,300 to $2,200 in fiberglass and $1,800 to $3,500 in wood or clad wood, so a house with 15 to 20 windows typically runs $18,000 to $45,000. Our climate is mild, so the payoff is less about heating bills than about comfort, condensation and stopping water from getting into walls.
What replacement windows and doors cost here
| Item | Installed range | Notes |
|---|---|---|
| Vinyl window, insert | $900 – $1,600 | Most common replacement |
| Fiberglass window | $1,300 – $2,200 | Slimmer frames, paintable |
| Wood or clad-wood window | $1,800 – $3,500 | Period houses, interior wood |
| Full-frame installation, add per window | $300 – $900 | New flashing, trim and sometimes siding repair |
| Sliding patio door | $3,500 – $8,000 | Size and frame |
| Hinged or folding patio door | $5,000 – $15,000 | Multi-panel systems higher |
| Entry door with frame | $2,500 – $7,000 | Fiberglass, steel or wood |
Frame materials compared
Vinyl is affordable, low maintenance and energy efficient. Frames are bulkier than other materials, colors are limited and dark vinyl can warp in direct sun.
Fiberglass is stiff, stable and paintable, with narrower frames that suit older houses. It costs more than vinyl and less than wood.
Wood and clad wood suit Craftsman, Tudor and mid-century houses where the window is part of the architecture. Aluminum or fiberglass cladding protects the exterior; the interior stays wood. They need the most care.
Aluminum windows on mid-century houses are thin and handsome but conduct cold, which is why they sweat in winter. New thermally broken aluminum performs much better.
Insert or full-frame installation
Insert replacement fits a new window into the existing frame. It is faster, cheaper and leaves interior and exterior trim alone, but it shrinks the glass slightly and relies on the old frame and flashing being sound.
Full-frame replacement removes the old window down to the rough opening, which lets the installer inspect for rot, install new flashing and seal the opening properly. It costs more and touches trim and sometimes siding. On houses with any history of leaks, it is the safer choice.
Condensation and comfort
Winter condensation on the inside of old single-pane or aluminum windows is common here, and it rots sills and grows mold. New double-pane windows with warm-edge spacers usually solve it. If new windows still sweat, the house humidity is too high, and a bathroom or kitchen fan that actually vents outside is the fix.
Energy code and permits
Replacement windows must meet the Washington State Energy Code's limits on heat loss. Same-size replacements are treated differently from new or enlarged openings, which change the wall structure and generally need a building permit. Some cities and historic districts have their own rules. Check through the Permit Checker.
Houses built before 1978 often have lead paint on original window sashes and trim. Replacing them disturbs that paint, so the installer must be certified for lead-safe work under Washington's renovation rules.
How to vet a window installer
- Confirm L&I registration, bond and insurance.
- Ask who installs: the dealer's own crew or a subcontractor.
- Ask whether the quote is insert or full-frame, window by window.
- Ask how they flash and seal each opening, and what they do if they find rot.
- Get the window model, glass package and U-factor for each window in writing.
- Get both warranties: the manufacturer's on the product and the installer's on the labor.
Window quote red flags
- A per-window price with no window schedule listing sizes, styles and models.
- Pressure to sign the same day for a "today only" discount.
- No mention of interior and exterior trim, caulking or disposal.
- "Full-frame" quoted at insert prices, or the reverse.
- No lead-safe certification on a pre-1978 house.
Window guides by city
Questions about windows
Will new windows lower my heating bill much?
Some, especially if the old windows are single-pane or leaky. In this mild climate the bigger gains are comfort near the glass and an end to condensation.
Can I replace windows one room at a time?
Yes. Ordering the same product line keeps the look consistent.
How long does installation take?
One to three days for most houses once the windows arrive. Lead times for windows are often several weeks.
Should I restore my original wood windows instead?
On historic houses, restoration plus storm windows can perform well and keep the character. It suits owners who value the original look and are willing to maintain them.
Are triple-pane windows worth it here?
Usually not on cost alone in this climate, but they help with traffic noise and very large glass areas.