Whole-house window replacement cost calculator
Budget replacing every window in the house from your own per-window price, labor, add-ons and a contingency — volume jobs often earn a discount.
A whole-house job of 15 windows at $600.00 each plus labor and add-ons is about $12,650.00 with 10% contingency. Whole-house projects often earn a volume discount — enter your own quoted prices.
Calculator inputs
Replacing every window at once is the same math as a partial job, scaled up — but the economics shift. A whole-house project is where installers most often extend a volume discount, and it is also where access, disposal and lead-safe add-ons compound across a dozen or more openings. This estimator lets you model all of it: the total count, your per-window price, one labor line, add-ons, the discount and a contingency for the openings that fight back.
Not sure how many windows the house has? Total them room by room with the window count calculator first, then bring the number here.
Formula
total = (windows × your $/window + labor + add-ons − discount) × (1 + contingency%)
Worked example
Fifteen windows at $600 each is $9,000. Add $2,500 labor, no add-ons, no discount → an $11,500 subtotal. With a 10% contingency: $11,500 × 1.10 = $12,650.
Negotiate a $1,000 volume discount and the subtotal drops to $10,500, landing the job near $11,550 — the discount is applied before the contingency, so the buffer scales down with it.
Where a whole-house job differs
Three things change at whole-house scale. First, discounts are real — a crew mobilizing once for fifteen windows is more efficient than fifteen separate visits, and that shows up in the price. Second, add-ons multiply: disposal of fifteen old units, casing for fifteen openings, and lead-safe practices across an entire pre-1978 home add up fast. Third, phasing is an option — some owners do the worst elevations first; if you phase, price each phase on its own so you do not lose the volume discount by splitting the job too finely.
As always, measure and confirm each opening before ordering; a whole-house order magnifies a sizing mistake fifteenfold.
Reference table
| Window type | Typical installed $/window | Fit |
|---|---|---|
| Double-hung | $300–$800 | Two vertical sashes; the value default |
| Casement | $400–$1,000 | Crank-out; seals tight, opens fully for egress |
| Sliding | $350–$900 | Horizontal glider; value option |
| Awning | $400–$1,000 | Top-hinged; vents in rain |
| Picture | $300–$1,200 | Fixed; best U-factor, no ventilation |
| Bay / bow | $1,500–$4,500 | Projecting multi-panel unit |
Labeled planning bands for installed replacement windows (material + labor). You enter your own quoted price — the band is only a sanity guide.