🪟 Window Replacement Cost Calculator

Cost by window style (installed, including labor):

• Double-hung vinyl: $300–$700
• Casement vinyl: $400–$800
• Sliding vinyl: $350–$750
• Picture/fixed vinyl: $250–$600
• Bay window: $1,200–$4,500
• Bow window: $2,000–$6,000
• Egress window: $800–$3,500 (requires excavation)
• Skylight: $1,000–$3,500

Material premium over vinyl (double-hung example):

• Aluminum: +20–40%
• Wood: +50–100%
• Wood-clad: +40–80%
• Fiberglass: +50–100%

Whole-house replacement (10–15 windows):

• Economy vinyl: $5,000–$9,000
• Mid-range vinyl: $8,000–$14,000
• Fiberglass: $15,000–$25,000+

Best glass package for most homes: Double-pane Low-E with argon gas

Why it's the sweet spot:

• Low-E coating reflects up to 84% of radiant heat
• Argon gas fill reduces conduction through the pane
• U-factor of 0.25–0.30 (lower is better — single pane is 1.0)
• Costs $30–$80 more per window than basic double-pane
• Pays back in 2–5 years through energy savings

Triple-pane: when it's worth it

• Very cold climates (Zone 6–8: Minnesota, Montana, northern states)
• Passive house or net-zero energy builds
• South-facing windows with high solar gain
• U-factor of 0.12–0.20 — significantly better than double
• Costs 15–30% more than double-pane Low-E

Best frame for energy efficiency: Fiberglass — lowest thermal conductivity, maintains seal over decades.

Clear signs to replace:

• Foggy between panes — failed insulating gas seal, can't be repaired (replace window)
• Drafts you can't fix with new weather stripping
• Wood rot in frame or sill
• Windows won't stay open — failed balancers, expensive to repair
• Single-pane glass — any window pre-1990 is almost certainly single-pane
• Ice on inside in winter — severe thermal failure

Can be repaired instead:

• Broken hardware (locks, cranks): $50–$150
• New weather stripping: $20–$100 DIY
• Single cracked pane (single-pane only): $100–$200
• Failed caulk around exterior: $50 DIY

Free test: Hold a candle 6 inches from the window on a windy day. If the flame flickers, you have a draft. Replace weather stripping first — if it still flickers, consider full replacement.

Federal Energy Efficient Home Improvement Credit (Section 25C):

• 30% tax credit on qualifying exterior windows
• Maximum $600 per year for windows and skylights
• Available tax years 2023–2032
• Windows must meet ENERGY STAR Most Efficient criteria
• Claim on IRS Form 5695

To qualify:

• Must be your primary residence (not rental)
• Window must be ENERGY STAR certified (ask contractor)
• Keep the product certification and receipts

State and utility rebates (additional savings):

• Many utility companies offer $2–$10 per window rebate
• Some states have additional energy efficiency tax credits
• Check DSIRE (Database of State Incentives for Renewables & Efficiency) at dsireusa.org

Example: 10-window project at $8,000 total

• 30% credit: $2,400 calculated — but capped at $600
• Net after federal credit: $7,400
• Plus any state/utility rebates

Whole-house at once — pros:

• 10–20% labor discount for bundling
• Consistent appearance throughout home
• Single disruption vs. repeated visits
• Manufacturer often provides extended warranty on large orders
• Contractors may negotiate better pricing on bulk orders

Phased replacement — when it makes sense:

• Budget constraint — replace the worst offenders first
• Priority: south and west-facing windows lose the most heat/cool air
• Priority: rooms where you spend the most time (bedroom, living room)
• Priority: any window with rot, fog, or security concerns

Phased approach order:

1. Any failed (foggy) windows — immediate energy waste
2. Single-pane windows on south/west walls
3. Bedrooms for noise and comfort
4. Remaining windows in next 2–3 years