Calculate the estimated cost of window replacement — product, labor, and finishing — with an itemized breakdown. National average cost: $400–$1,200 per window. Enter your project size below for an itemized breakdown — adjust any line item to match your local prices and scope.
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Try Suparate FreeMeasure rough opening, not the existing window
Order replacement windows sized to the rough opening, not the current window's frame dimensions. Measure width at three points (top, middle, bottom) and height at three points (left, middle, right) — take the smallest measurement and subtract 1/2" for shimming clearance. An incorrectly sized window requires custom fabrication or rough opening modification.
Flash before trimming — every time
The #1 cause of window-related water damage is improper or missing flashing at the sill and head. Apply a self-adhering flashing membrane (such as Flextape or Vycor) at the sill before setting the window, and lap the head flashing over the exterior trim after installation. Proper flashing takes 20 minutes and prevents $5,000–$30,000 in structural water damage.
Replace all windows in a single order from one manufacturer
Windows from the same manufacturer and product line have matching profiles, hardware, and colors. Mixing brands or ordering in two phases creates visible mismatches in frame profile, glass tint, and hardware. Order all windows at once, even if installation happens in phases, to guarantee consistency across the whole house.
Standard double-pane vinyl window replacement (insert/pocket replacement) costs $400–$900 per window installed for typical sizes. Full-frame replacement (removing the entire frame and jamb) costs $700–$1,500 per window. Large picture windows, bay windows, and specialty shapes cost significantly more. Replacing all windows in a 1,500 sq ft home (typically 15–20 windows) runs $8,000–$20,000.
Quality vinyl double-pane windows last 20–30 years. The glass seal (between panes) is the most common failure point — a failed seal causes fogging and condensation between panes, reducing energy efficiency. Most manufacturers offer 20–25 year glass seal warranties on premium products. Fiberglass windows have a longer lifespan (30–50 years) at a 20–30% higher price point.
Insert (pocket) replacement slides a new window unit into the existing frame, which stays in place. This is faster and less expensive but requires the existing frame to be in good condition. Full-frame replacement removes everything — glass, sash, frame, and jamb — down to the rough opening. Full-frame is required when the existing frame is rotted, out of square, or when changing window size.
For energy efficiency, look for ENERGY STAR certification and the NFRC label. U-factor (heat loss): lower is better; target ≤0.30 for cold climates. SHGC (solar heat gain): lower reduces cooling loads in hot climates; higher retains solar warmth in cold climates. Air leakage: ≤0.30 cfm/sq ft. For security, look for windows meeting AAMA Grade R (residential) or higher with multi-point locking hardware.
Replace windows before new siding whenever possible. New siding installation requires the window flanges to be properly integrated with the weather-resistant barrier and flashing, which can't be done correctly with old windows in place. If you're doing a full exterior renovation, windows go first, then house wrap and flashing, then siding. Installing windows into finished siding risks water infiltration at the perimeter.
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