Everything you need to know before hiring a window replacement company.
Single double-hung windows cost $300–$800 installed for vinyl; $500–$1,200 for fiberglass or wood-clad. Specialty windows (bay, bow, casement, egress) cost more. A whole-home replacement (15–25 windows) typically runs $8,000–$20,000. Brand-name replacement windows (Andersen, Marvin, Pella) command premium prices; private-label windows from regional manufacturers often provide comparable performance at lower cost.
Insert (pocket) replacement fits a new window unit into the existing frame, preserving the interior trim and exterior casing. It is less invasive and less expensive but requires the existing frame to be in good condition. Full-frame replacement removes the entire window assembly down to the rough opening, allowing inspection and repair of framing, flashing, and insulation — recommended when frames show rot, water damage, or significant air infiltration.
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Find a ContractorVinyl windows are the most popular — affordable, low maintenance, good insulation, no painting required. They can sag or warp in extreme heat. Fiberglass windows are stronger, more dimensionally stable, and better insulating than vinyl — premium choice. Wood windows offer the best aesthetics (especially interior) but require maintenance. Wood-clad windows have interior wood and an exterior aluminum or fiberglass cladding for low maintenance.
U-factor measures how well a window insulates against heat loss. Lower is better: single-pane windows have U-factors of 0.8–1.1; standard double-pane 0.3–0.5; high-performance double-pane with low-E coating 0.20–0.30; triple-pane 0.15–0.22. ENERGY STAR requires U-factor ≤ 0.27 in cold climates, ≤ 0.40 in mixed climates.
Low-emissivity (low-E) glass has a microscopic metallic coating that reflects infrared heat. It reduces heat loss in winter (keeping heat inside) and solar heat gain in summer (reflecting heat outside), improving energy efficiency year-round. Low-E glass is standard in most energy-efficient windows. Solar Heat Gain Coefficient (SHGC) measures how much solar heat the glass allows in — lower SHGC reduces cooling loads in hot climates.
Yes. ENERGY STAR certified windows meet strict energy performance criteria and can reduce heating and cooling costs by 12–24% compared to single-pane windows and up to 15% compared to standard double-pane. They may qualify for federal tax credits (up to $600/year under current IRA provisions) and utility rebates. The payback period is typically 5–10 years in energy savings.
Experienced crews install 2–4 windows per day. A full home (15–25 windows) typically takes 2–4 days. Insert replacements are faster than full-frame replacements. Most crews can complete a whole-home replacement in a single week with proper crew size and scheduling.
Requirements vary by jurisdiction. Many localities don't require permits for like-for-like window replacements of the same size and type. Changing window sizes, adding new windows where none existed, or egress window installations typically require permits. Contractors familiar with local codes will advise you appropriately.
Premium window brands (Andersen, Marvin, Pella) offer lifetime limited warranties on frames and glass packages. Installation labor warranties vary by contractor — 1–5 years is typical; the best contractors offer lifetime labor warranties. Seal failures (fogging between panes) are a common warranty claim — confirm your window's glass unit warranty covers seal failure for at least 10–20 years.
Ensure quotes specify the window brand, series, frame material, glass package (U-factor, SHGC, low-E, gas fill), installation method (insert vs. full-frame), and what's included (interior/exterior trim, caulking, cleanup). Compare apples-to-apples — different brands and glass packages make quotes appear incomparable. Check the company's reviews, license status, and warranty terms before deciding.