Window replacement cost is one of the most searched home improvement topics, and one of the hardest to answer with a single number. The range is genuinely wide because the variables that affect price, frame material, glass configuration, window style, installation complexity, and what is found in the rough opening, can push a project significantly in either direction.
This guide gives realistic 2025 pricing for window replacement projects in the greater Seattle area, organized by window type, frame material, and home size. The goal is to give homeowners enough information to evaluate quotes intelligently and recognize when a number is unusually low or high.
| About these ranges: All pricing below reflects installed costs in the greater Seattle and Snohomish County market as of 2025, including the window unit, installation labor, disposal of old windows, and standard trim restoration. Structural repairs to the rough opening, rot remediation, or custom sizing add cost beyond these ranges. |
Window Replacement Cost by Frame Material
Frame material is the largest single driver of window cost. Here is what each material typically costs per window installed in the Seattle area:
| Frame Material | Cost Per Window (Installed) | Lifespan | Best For |
| Standard vinyl | $300 to $600 | 20 to 30 years | Budget-conscious replacements, rental properties, straightforward openings |
| Premium vinyl (low-E, argon, warm-edge) | $500 to $900 | 25 to 40 years | Most residential replacements in the Seattle area, best value for performance |
| Fiberglass | $600 to $1,400 | 30 to 50+ years | Long-term investment, larger openings, homes with significant thermal performance goals |
| Wood-clad (exterior aluminum or fiberglass) | $900 to $2,000+ | 30 to 50 years | Historic homes, premium aesthetic, high-end renovations |
| Aluminum (thermally broken) | $500 to $1,100 | 30 to 40 years | Modern architecture, large picture windows, commercial-style residential |
Window Replacement Cost by Window Style
Window style affects both material cost and installation labor. Fixed picture windows are the simplest to install; casement and awning windows with operating hardware cost more. Here is a typical range by style:
| Window Style | Typical Cost Range (Installed) | Notes |
| Single or double-hung | $350 to $900 | Most common residential style, widely available in standard sizes |
| Casement | $400 to $1,000 | Opens outward on a hinge, excellent seal when closed, good for PNW weather resistance |
| Awning | $400 to $1,000 | Top-hinged, can remain open during light rain, popular for bathrooms and kitchens |
| Sliding | $350 to $850 | Horizontal operation, no hardware mechanism, typically lower cost than casement |
| Fixed or picture | $250 to $750 | No moving parts, most thermally efficient style, lower installation cost |
| Bay or bow | $1,500 to $5,000+ | Multi-window unit projecting from wall, significantly more complex installation |
| Egress (basement) | $900 to $2,500 | Requires rough opening modification, permit typically required |
Full-Home Window Replacement Cost by Number of Windows
For homeowners replacing all windows at once, here are realistic budget ranges by home size for the most common material choices:
| Home Size | Typical Window Count | Premium Vinyl (Installed) | Fiberglass (Installed) |
| Small (under 1,500 sq ft) | 8 to 12 windows | $5,000 to $9,000 | $8,000 to $16,000 |
| Medium (1,500 to 2,500 sq ft) | 12 to 18 windows | $8,000 to $15,000 | $14,000 to $24,000 |
| Large (2,500 to 3,500 sq ft) | 18 to 25 windows | $13,000 to $22,000 | $18,000 to $35,000 |
| Extra large (over 3,500 sq ft) | 25+ windows | $18,000 to $30,000+ | $25,000 to $50,000+ |
What Drives Window Replacement Costs Up
Rough Opening Repairs
When old windows are removed, the rough opening condition is revealed. Rot in the sill, header, or surrounding framing must be repaired before new windows can be properly installed. In older Pacific Northwest homes, sill rot is extremely common due to years of moisture exposure from failed window seals or inadequate exterior flashing. This is the same type of damage covered in our post on dry rot behind siding, and it adds $200 to $1,500 or more per window depending on extent.
Non-Standard Window Sizes
Stock window sizes are manufactured in large volumes and cost significantly less than custom-sized units. Homes with unusual rough opening dimensions, common in older construction where window sizing was not standardized, may require custom-ordered units that carry a 20 to 40 percent premium over stock sizes.
Permit Requirements
Window replacement typically requires a permit in most Washington state jurisdictions when the rough opening size is being modified, when egress requirements are affected, or when structural changes are involved. Permits add $150 to $400 to the project cost and require inspection. A reputable contractor handles the permit process as part of the project.
Multi-Story Access
Second-story windows require ladders or scaffolding for safe installation. This adds labor time and equipment cost. Expect a 10 to 20 percent premium on second-floor windows compared to ground-level units of the same specification.
Is Window Replacement Worth the Cost?
For most homeowners replacing single-pane or early double-pane windows in a Pacific Northwest home, yes. The combination of energy savings, comfort improvement, noise reduction, and moisture risk reduction typically justifies the investment over a 10 to 15 year payback period.
Window replacement also contributes positively to home value. Quality window replacement returns approximately 60 to 70 percent of its cost at resale on average. For homeowners planning to sell, new windows remove a common inspection finding and improve buyer confidence. Consider pairing window replacement with siding replacement if both are needed, since completing both projects together reduces overall labor cost and disruption.
| The cost of waiting:Failed window seals allow moisture into the rough opening, which accelerates rot in the sill and framing. A window that costs $600 to replace today can cost $1,500 or more once rough opening repairs are factored in after a few additional years of moisture exposure. Acting before structural damage progresses is almost always the lower-cost path. |
Frequently Asked Questions
How much does it cost to replace windows in a house?
For a typical home in the greater Seattle area in 2025, full window replacement ranges from $8,000 to $24,000 for premium vinyl and $14,000 to $35,000 for fiberglass, depending on the number of windows and complexity of the project. Individual window replacement typically runs $350 to $1,400 per window installed depending on style and material.
Is it cheaper to repair or replace windows?
It depends on the failure. Weatherstripping, hardware, and balance replacement are legitimate repairs that can extend window life. Failed sealed glass units, rotted frames, or warped sashes typically make replacement the more economical long-term choice. See our post on how long windows last for a full framework on when repair vs. replacement makes sense.
How long does window replacement take?
A professional crew typically installs 8 to 12 windows per day. A full-home replacement on a medium-sized home with 14 to 18 windows usually takes 2 to 3 days, not including any rough opening repairs that may be needed. Crews work on the exterior, so interior disruption is minimal.
Should I replace all windows at once or a few at a time?
Replacing all windows at once typically costs less per window than replacing in phases due to mobilization and setup costs. It also ensures consistent appearance and performance across the home. However, phased replacement is a reasonable approach for homeowners who need to spread the cost, prioritizing the worst-performing windows first.
Does window replacement require a permit?
In most Washington state jurisdictions, like-for-like window replacement in the same rough opening does not require a permit. Modifications to rough opening size, egress window installation, or structural changes do require permits. Premier Siding and Exteriors handles window installation permits as part of every project that requires them.
| Get a Transparent Window Replacement EstimatePremier Siding and Exteriors provides free, written, itemized window replacement estimates for homeowners across the greater Seattle area. No pressure, no hidden fees, no vague numbers.Call (425) 583-3753 or visit premsidingllc.com to schedule your free estimate. |