Window Replacement Cost Calculator

Nationally, replacing one standard residential window costs roughly $450 to $945 installed for common vinyl or wood double-hung units (retrofit install). Specialty units such as bay or bow windows run $1,800 to $2,900 each. Full-frame installation typically adds about 40% on top of retrofit pricing because the old frame is fully removed and the opening is rebuilt.

Using typical mid-range pricing, 10 double-hung vinyl windows with retrofit installation cost about $650 each, for a project total of $6,500. The same 10 windows with full-frame installation cost about $910 each, or $9,100 total. Actual bids vary by region, brand, and glass options.

Retrofit (insert) installation slides the new window into the existing frame, so it is faster and cheaper but keeps the old frame. Full-frame installation removes the entire old window down to the studs and installs a completely new unit, which costs about 40% more but fixes rot, air leaks around the frame, and sizing problems. Choose full-frame when frames are damaged or you want a different window size.

Vinyl is the cheapest common frame material, typically 30-45% less than wood. Aluminum is also inexpensive but insulates poorly. Fiberglass costs about 25% more than vinyl but is stronger and more stable, while wood costs about 45% more than vinyl and needs periodic painting or sealing.

Replacing old single-pane windows (U-factor ~0.90) with double-pane ENERGY STAR windows (U-factor ~0.30) can cut the heat conducted through the glass by roughly two-thirds. Example: 10 windows totaling 120 sq ft in a 4,500 heating-degree-day climate save about 2,279 kWh per year, or about $387 per year at $0.17 per kWh. Savings are smaller if your old windows are already double-pane.

Divide the total project cost by the estimated annual energy savings. Example: a $9,100 full-frame project that saves $387 per year has a simple payback of about 23.5 years on energy savings alone. Most homeowners justify the project through comfort, noise reduction, resale value, and avoided repairs — not energy payback alone.

Normalize every bid to cost per window (total divided by window count) so quotes are comparable. In this tool's worked example, quotes of $8,400, $9,900, and $5,200 for 10 windows work out to $840, $990, and $520 per window. A bid more than about 30% below the highest quote is a red flag — verify that the scope, glass package, frame material, and warranty are truly equivalent before choosing it.

An unusually cheap quote often means a smaller scope: retrofit instead of full-frame install, builder-grade vinyl instead of the quoted brand, single-pane or no low-E coating, excluded trim/capping work, or no labor warranty. Ask each contractor for the exact window model number, glass package, install method, and warranty terms in writing, then compare line by line.

Yes. Prices in this calculator assume standard residential sizes (roughly 24x36 to 36x60 inches). Oversized units, custom shapes, tempered or laminated safety glass, and triple-pane glass can add 20-60% per window. Bay and bow windows cost several times more because they are multi-panel assemblies that often need structural support.

Usually yes. Contractors spread fixed costs — crew mobilization, permits, dumpster, scaffolding — across the whole job, so the per-window price of a 10-window project is often 10-20% lower than doing the same windows one or two at a time. Phasing still makes sense if the budget is tight; start with the worst-performing rooms.

Remodeling surveys consistently show vinyl window replacement recoups roughly 60-70% of its cost at resale, among the better returns for exterior projects. The bigger day-to-day returns are lower drafts, less outside noise, easier cleaning (tilt-in sashes), and no more stuck or painted-shut windows.

Look for a U-factor of 0.30 or lower for double-pane units in most climates (lower is better insulation); 0.20-0.25 for triple-pane in cold climates. Also check the Solar Heat Gain Coefficient (SHGC): lower SHGC (~0.25) suits hot climates, higher (~0.40) helps passive solar heating in cold climates. ENERGY STAR labels certify both for your climate zone.