Window installers replace and install windows in homes and light commercial buildings, either as independent contractors, small crews, or subcontractors for remodelers and window dealers. Invoices typically cover labor per window, the windows themselves if you supply them, trim and flashing materials, and disposal of old units.
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Most window installers price per window opening, with the price changing by window size, type, and story height. Labor-only installs are common when the homeowner or a dealer supplies the windows, while full-service jobs add the cost of the windows plus a markup, often 15 to 35 percent. Retrofit (insert) installs into an existing frame cost less than full-frame replacements that involve removing trim, flashing, and sometimes repairing rot or framing. Extras are billed separately: interior and exterior trim, custom wraps, second-story or hard-to-reach access, lead-safe work in pre-1978 homes, stucco or brick cutting, and haul-away. Large jobs are often quoted as a flat total with a deposit and progress payments, while small repairs and add-ons are billed hourly. Subcontractors working for a general contractor usually bill per opening or on a schedule of values.
| Service | Priced | Typical range |
|---|---|---|
| Insert/retrofit replacement, standard double-hung (labor only) | per window | $100-250 |
| Full-frame replacement, standard size (labor only) | per window | $250-600 |
| Large picture window or slider install (labor only) | per window | $300-750 |
| Bay or bow window install | per unit | $800-2,500 |
| Interior casing and exterior trim wrap | per window | $75-250 |
| Rot repair or sill/framing repair | per hour | $65-110 |
| Old window removal and disposal | per window | $15-50 |
| Second-story or difficult access surcharge | per window | $25-100 |
Typical US ranges. Rates vary by region, experience, and job size.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Full-frame replacement, double-hung vinyl windows (labor, includes flashing tape and foam insulation) | 8 window | $375.00 | $3,000.00 |
| Large sliding window install, 72" x 48" (labor) | 1 window | $450.00 | $450.00 |
| Vinyl windows supplied per order #4471 (8 double-hung, 1 slider) | 9 window | $410.00 | $3,690.00 |
| Interior casing and paint-ready trim | 9 window | $110.00 | $990.00 |
| Sill rot repair, rear bedroom | 3 hour | $85.00 | $255.00 |
| Old window removal and disposal | 9 window | $30.00 | $270.00 |
| Total | $8,655.00 | ||
Notes: Deposit of $3,500 received on 03/04 and applied. Balance due within 10 days of completion. Windows carry manufacturer warranty per attached documentation; installation is warranted for 2 years against leaks caused by workmanship. Late balances accrue 1.5% per month.
Listing each opening (for example, "Master bedroom, 36x60 double-hung") prevents disputes about what was installed and helps with warranty claims later.
If the client or you purchased the windows, the brand and order details tie the invoice to the product warranty and make reorders or defect claims easier.
Separating installation labor from supplied windows and materials helps with sales tax treatment, which varies by state, and shows clients what they are paying for.
Many states and cities require a license number on contracts and invoices, and clients and insurers often ask for proof of coverage.
Rot repair, unexpected framing issues, and trim upgrades found mid-job should appear as separate lines referencing the signed change order.
For pre-1978 homes, note any lead-safe work practices used, and include permit numbers where your area requires them for window replacement.
Showing amounts already paid and the remaining balance avoids confusion on large jobs billed in stages.
A clear statement of how long your install is covered, and what is excluded, sets expectations before a leak call comes in.
Window jobs often require a deposit of 30 to 50 percent at signing, mainly to cover the cost of ordering custom windows, which are usually non-refundable once in production. On larger projects, a second payment may be due when windows are delivered, with the balance due on completion or within 7 to 14 days. Small labor-only jobs are commonly paid on the day of completion. Common payment methods include checks, ACH transfer, and credit cards, sometimes with a card processing fee passed on where allowed. State your late fee and any final-payment-before-warranty policy in the contract. Check your state's rules on deposit limits for home improvement contracts, as some states cap them.
Custom-sized windows cannot be returned, so never order until the deposit clears. Put the non-refundable nature of custom orders in writing.
Mark up supplied windows, trim stock, and sealants to cover ordering time, delivery, handling, and the risk of damaged or mis-sized units. Itemize the window cost so clients see the product price.
Take photos of rot, water damage, and existing interior finishes. This supports extra charges for repairs and protects you if clients later claim you caused damage.
Get written approval for hidden damage repairs or upgrades before doing the work, then list them as separate invoice lines so the final bill matches what was agreed.
Do a walkthrough on completion day, fix punch-list items, and collect the balance at sign-off so small touch-ups do not turn into weeks of delayed payment.
Per window is standard for installs because it is easy for clients to compare and rewards efficiency. Use hourly rates for repairs, rot, and anything where the scope is unknown until the wall is open.
It depends on the state. In many states, materials you sell are taxable, while installation labor on real property may not be, and some states treat contractors as the final consumer of materials. Check with your state revenue department or an accountant.
Bill labor only and state on the invoice that the client supplied the windows. Add a line in your contract that you are not responsible for defects, wrong sizes, or manufacturer warranty on client-supplied product.
If the error comes from the client's measurements or a change in order, yes, and your contract should say so. If you measured and ordered incorrectly, expect to absorb the cost, which is why many installers have clients sign off on measurements.
Most installers make it due on completion or within 7 to 14 days. Collecting at the final walkthrough works best because the client has just seen the finished work.
Send a Window Installer estimate for approval, then turn it into an invoice when the work is done.
Window Installer estimate template