How Much Does It Cost to Replace All the Windows in a House?

Replacing 10 windows costs $5,000–$9,000 in vinyl, $8,000–$14,000 in fiberglass, and $12,000–$20,000+ in wood/clad — installed, 2026 US pricing. Per window, expect $400–$800 (vinyl double-hung, the most common job in America), $700–$1,200 (fiberglass), and $900–$1,600 (wood). The material is the single biggest lever — vinyl to wood roughly doubles the job — followed by retrofit vs. full-frame installation (+30–50%) and window style. Everything below breaks down where the money goes and how contractors should bid it.

Window replacement cost by type and material

Installed prices per window, 2026. Retrofit installation (new window in the existing frame) is the baseline; full-frame adds 30–50%.

Whole-house math: a 10-window vinyl job at $650/window is $6,500; the same house in fiberglass at $1,050/window is $10,500. Contractors who bid whole-house get 10–20% better per-window economics than one-at-a-time work — one mobilization, one dumpster, one permit — and should pass some of that through as a bundle incentive.

Frame materials compared

For most US homes, the real decision is vinyl vs. fiberglass. Vinyl wins on price and is perfectly good for 20–30 years; fiberglass wins on strength, longevity (30–50 years), and resale perception. Wood is for historic homes and clients who specifically want it — never the default recommendation.

Retrofit vs. full-frame: the bid-defining choice

Retrofit (insert) replacement fits the new window into the existing frame. It's faster (30–60 minutes per window), cheaper, and right for roughly 70% of jobs — whenever the existing frames are square, solid, and rot-free. Full-frame replacement removes everything down to the studs: more carpentry, new interior/exterior trim, and the chance to fix rot, air leaks, and insulation gaps. It costs 30–50% more and takes 1–2 hours per window — but it's the only honest option when frames are damaged.

Bid retrofit by default; sell full-frame where the inspection justifies it. The tell-tale signs: soft or discolored wood at the sill, visible daylight around the frame, or windows that have been painted shut for a decade. Photograph the evidence — “your sills are rotted, here's the photo” sells the upgrade better than any brochure.

Glass options worth quoting

• Double-pane Low-E with argon: the 2026 standard. Good efficiency, reasonable cost — the baseline for every bid.
• Triple-pane: +$100–$200/window. Worth it in cold climates (Zone 5+) and for noise reduction near highways or airports.
• Laminated glass: +$150–$300/window. Security, storm protection, and serious sound dampening — an easy upsell on ground-floor street-facing windows.
• Tempered glass: required by code near doors, in bathrooms, and for large low windows. Know your local code — it's not optional where it applies.

Federal tax credits and utility rebates for efficient windows change year to year — check energystar.gov and the client's utility before quoting, and put any rebate math on the bid as a separate line so the gross price stays honest.

Window energy ratings explained

Every window sold in the US carries an NFRC label with four numbers. Learn them — they're how you justify the upgrade from builder-grade to premium glass:

• U-factor (0.20–1.20): how well the window insulates — lower is better. Double-pane Low-E runs ~0.30; triple-pane hits ~0.20. This is the headline number in cold climates.
• SHGC — Solar Heat Gain Coefficient (0–1): how much solar heat passes through — lower blocks more heat. Low SHGC (~0.25) for hot climates and west-facing windows; higher SHGC (~0.40+) can help passive solar heating in cold climates on south-facing glass.
• VT — Visible Transmittance (0–1): how much light comes through. Higher is brighter; Low-E coatings trade a little VT for efficiency. Clients who complain new windows feel “dark” are reacting to low VT — spec accordingly.
• Air Leakage (≤0.30): how much air sneaks past the seals — lower is tighter. Casements and awnings (compression seals) beat sliders and double-hungs (sliding seals) here.

Look for the Energy Star label matched to your climate zone — the requirements differ by region, and a window that qualifies in Texas may not in Minnesota. When a client asks “are triple-pane worth it?”, the honest answer is U-factor math: in Zone 6–7 heating climates, yes; in mild Zone 2–3, the payback stretches past 20 years and the money is better spent on air sealing.

What moves the bid (beyond material)

• Second story: ladder and staging time adds ~15–25% on labor. Mention it as a line, not a surprise.
• Lead paint (pre-1978 homes): EPA RRP rules require certified procedures — containment, cleaning verification, documentation. Price it in ($100–$200/window); the fine for skipping it is $40,000+ per day.
• Trim and casing: interior trim repair/replacement and exterior brickmould or cladding — often $75–$150/window and frequently forgotten in low bids.
• Disposal: $25–$50 per old window if not included. Old windows are bulky; the dumpster isn't free.
• Structural surprises: rot found during full-frame work. Bid an allowance, exactly like siding sheathing — never fixed blind.
• Permits: required in many jurisdictions for full-frame; rarely for retrofit. Check locally.

For contractors: how to bid windows

Price per window, show material tiers side by side, and make disposal and trim visible lines — “included” gets forgotten, itemized gets respected. Walk every window (open it, check the sill, look for fog between panes indicating seal failure), photograph problems, and note which openings are retrofit vs. full-frame on the bid itself. Clients comparing three bids choose the one that proves the bidder actually looked.

Two high-leverage moves: bundle the whole house with a visible 10–15% multi-window incentive, and pair with siding — windows and siding are frequently done together, and quoting both keeps the job with you instead of splitting it across contractors. Run the exact count through the window calculator and send the quote the same day you measure.

Costly mistakes to avoid

Not every bad window needs replacing. Repair wins when: the frame is solid and only the hardware or weatherstripping failed ($50–$200 per window), a single sash is damaged, or the glass is fogged but the client just needs a few more years — glass-only replacement runs $150–$400 per sash versus $600+ for the whole unit. Replace when: frames are rotted, seals have failed across most of the house, or single-pane windows are driving real energy costs. Saying “you don't need new windows here” on the two good ones is how you win the other eight.

• Quoting without opening every window. Painted-shut, rotted, or fogged units change the scope — find them during the estimate, not the install.
• Ignoring lead paint rules. Pre-1978 means RRP compliance. No exceptions, no shortcuts.
• Burying disposal and trim. They're real costs; hiding them just makes your bid look padded when the client finds out.
• Promising energy savings you can't quantify. “Up to 25%” on the window portion of the bill is honest; “cut your bills in half” is a lawsuit.
• One-size-fits-all glass. Street-facing gets laminated, cold climate gets triple-pane — spec the glass to the orientation.
• Skipping the final walkthrough. Open, close, and lock every window with the client present. Ten minutes prevents ten callbacks.