Windows in Seattle, WA
Replacement windows on a Seattle house cost $1,000 to $1,800 each in vinyl or fiberglass and $2,000 to $3,800 in wood or clad wood, slightly above regional averages because many openings are custom sizes and full-frame work is common. Seattle's older houses also raise a choice newer suburbs rarely face: restore the original windows or replace them.
Seattle window costs
| Option | Typical Seattle range | When it fits |
|---|---|---|
| Vinyl insert replacement | $1,000 – $1,700 per window | Mid-century and newer houses |
| Fiberglass, insert or full-frame | $1,400 – $2,400 per window | Craftsman and Tudor houses wanting slim frames |
| Wood or clad wood, full-frame | $2,000 – $3,800 per window | Period houses and historic districts |
| Restoration of original wood sash | $600 – $1,500 per window | Sound frames, owner values original glass |
| Interior or exterior storm window | $300 – $900 per window | Pairs with restored originals |
Seattle windows by house era
Craftsman and bungalow houses often have original double-hung wood windows with wavy glass, sash weights and wide trim. They leak air at the sash, but the frames are often old-growth and sound. Restoration with weatherstripping plus storms can approach new-window comfort.
Tudors have casements and leaded or divided-light windows that define their look. Replacements need simulated divided lites with proper depth, or the house loses its character.
Mid-century houses often have original single-pane aluminum sliders that sweat in winter and conduct cold. These are the clearest case for replacement.
Infill and townhouses may be bound by condo or HOA rules on window style and color.
Seattle window rules
Same-size replacements and new or enlarged openings are treated differently: changing an opening alters the wall and generally needs a permit, and new windows must meet the state energy code. Houses in historic districts and city landmarks need review before window changes, and reviewers often favor repair or wood replacements on primary façades.
Pre-1978 houses almost certainly have lead paint on original sashes and trim. Removing or restoring them requires a lead-safe certified contractor.
Seattle condensation and moisture
Winter condensation on old Seattle windows usually comes from single glazing combined with high indoor humidity in small, closed-up houses. New windows help, but so does a bathroom fan that vents outside and a kitchen hood that is actually ducted out. Rotted sills under sweating windows are common and are best repaired during full-frame replacement.
Seattle window questions
Is restoration really comparable to new windows?
With weatherstripping and good storms, restored windows get close on comfort and keep the original look. New windows win on convenience and maintenance.
Do I need approval in a historic district?
Yes, for exterior changes on landmarked houses and in historic districts. Check before ordering windows.
How long do custom windows take to arrive?
Several weeks for most product lines; custom wood windows can take longer.
Can I replace just the front windows?
Yes. Many owners start with the street façade or the worst-performing rooms.