Window Replacement Invoice Template — Free Download (2026)
Window replacement invoices fail when the specs are vague — "install 10 windows" — and the homeowner later questions whether the right glass was installed, whether the Energy Star certification qualifies for their tax credit, or whether the flashing was done properly when water appears around the frame two years later. A window replacement invoice that documents the manufacturer, model, window type and size, frame material, glass specs (U-factor, SHGC, Low-E coating, argon fill, pane count), Energy Star certification, installation method (insert vs. full-frame), flashing, and both manufacturer and labor warranty gives both parties a durable record. This guide covers what to include on a window replacement invoice.
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Manufacturer, model, and window type per unit
'Window specification: Andersen 400 Series double-hung, 2868 (28" × 68" unit dimension, 30" × 70" rough opening). Frame: PVC exterior / wood interior, white exterior / unfinished pine interior. Hardware: standard sash lifts, traditional lock. Unit shipped factory-glazed.' List every window separately if sizes or types differ. 'Unit 1 (living room, south wall): Andersen 400 Series casement, 3035 unit, white exterior/pine interior. Unit 2 (kitchen): Andersen 400 Series picture fixed, 4040, same frame.' If all windows are the same model, a single spec line plus a count table is acceptable — but the spec must include the model number, not just the brand.
Glass specification: U-factor, SHGC, Low-E, argon, and pane count
'Glass: Andersen High-Performance Sun glass, triple-pane, Low-E4 coating (exterior face), argon/krypton gas fill. U-factor: 0.20. Solar Heat Gain Coefficient (SHGC): 0.25. Visible transmittance: 0.46. ENERGY STAR Certified: Northern Zone. NFRC label included on each unit — retain for tax credit documentation.' The U-factor and SHGC are the core efficiency specs — U-factor measures heat loss (lower = better), SHGC measures solar heat gain (lower = better for cooling climates, higher for heating climates). Energy Star certification in 2026 requires U-factor ≤ 0.25 and SHGC varies by climate zone — document it explicitly because homeowners claiming the federal energy efficiency tax credit need these numbers.
Installation method: insert replacement vs. full-frame replacement
'Installation method: insert replacement (pocket replacement). Existing frames, sills, and exterior trim remain. New window unit inserted into existing frame opening. No siding or exterior trim removal required. Applicable when: existing frames are structurally sound and square, no rot or moisture damage in frame or rough opening.' Or: 'Installation method: full-frame replacement. Existing window unit, frame, and trim removed to rough opening. New frame and window installed from rough opening out. Housewrap repaired/extended to cover rough opening before new frame installation. New exterior trim casing installed (brick mold, scope: basic 3.5" flat casing). Required when: existing frame is rotted, out of square, or window size is changing.' The installation method significantly affects price and what the homeowner sees — insert replacement is faster and less disruptive, full-frame is more thorough but involves interior and exterior patching.
Flashing: method, materials, and housewrap integration
'Flashing: flexible peel-and-stick flashing tape (DuPont Flextape or equivalent) applied to all four sides of rough opening before window installation. Sill pan: pre-sloped sill pan flashing installed with positive drainage to exterior. Housewrap integration: housewrap lapped over top flashing (flashing not over housewrap at head), under at sides and sill. All seams sealed with compatible tape. Exterior caulk: low-modulus flexible sealant (Sika Flex or equivalent) applied at window-to-trim interface after installation — leave 1/4" at bottom to allow drainage.' Flashing is where most window installation failures happen — and it's where most installation warranty disputes arise. Documenting your flashing method is both a quality record and your defense when water questions arise years later.
What's not included: painting, drywall, interior trim repair
'Not included: interior trim replacement or repainting (existing trim reinstalled or homeowner to patch/paint). Interior drywall repair if required after full-frame replacement. Exterior painting of new trim casing. Structural repair to rough opening framing (if rot is discovered in structural framing members during removal, additional scope will be quoted and requires authorization before proceeding). Screen replacement (new windows ship with screens — damaged screens after installation are not warranty items). Blind or curtain rod reinstallation.' Window jobs generate a lot of 'while you're at it' requests — define the scope tightly and list the exclusions.
Window replacement invoice example
10-window whole-house replacement — Andersen 400 Series, insert method
INVOICE #WR-2026-0077
Clear View Windows | (614) 555-0199 | Customer: F. & A. Moreno | 1840 Sumac Ct., Hilliard, OH | Service: June 10, 2026 | 10-window whole-house replacement
| Item | Qty | Unit | Total |
|---|---|---|---|
| Andersen 400 Series double-hung, 2868, white/pine, Sun glass triple-pane, Low-E4, argon fill, U-0.20, SHGC-0.25. ENERGY STAR Northern Zone. Units 1–6 (bedrooms and living room). | 6 | units @ $1,240 | $7,440 |
| Andersen 400 Series casement, 3035, white/pine, same glass spec. Units 7–8 (kitchen). Includes cam lock hardware. | 2 | units @ $1,380 | $2,760 |
| Andersen 400 Series picture fixed, 4040, white/pine, same glass spec. Unit 9 (dining room). | 1 | unit @ $1,150 | $1,150 |
| Andersen 400 Series awning, 2422, white/pine, same glass spec. Unit 10 (basement egress). | 1 | unit @ $1,190 | $1,190 |
| Installation — insert replacement, all 10 units. Peel-and-stick flashing, sill pan, housewrap integration, caulk at trim interface. Existing interior trim reinstalled. | 10 | units @ $285 | $2,850 |
| Disposal — removal and haul of 10 existing window units. Foam insulation at frame gaps before window installation. | 10 | units @ $40 | $400 |
| Deposit paid June 4, 2026 | −$7,895 | ||
| Balance due on completion | $7,895 | ||
5 invoicing rules for window replacement contractors
Document U-factor and SHGC — homeowners need them for tax credits
The federal Energy Efficient Home Improvement Credit (Section 25C) allows up to $600 per year for qualifying windows and skylights. Qualifying windows must meet ENERGY STAR most-efficient criteria or have a U-factor ≤ 0.20 and SHGC ≤ 0.22 (requirements change — verify current specs at energystar.gov). Homeowners claiming this credit on IRS Form 5695 need the U-factor, SHGC, and ENERGY STAR certification documentation. Put it on the invoice. It's free information for you to document and expensive for the homeowner if they can't find it at tax time.
Specify insert vs. full-frame replacement — and what changes with each
Insert replacement and full-frame replacement look identical from inside after the job is done. But the price, scope, and what the homeowner discovers afterward differ significantly. With insert: existing frames stay, no exterior trim or siding disturbed, interior trim reinstalled or left in place. With full-frame: rough opening exposed, new frame and exterior trim installed, interior drywall may need patching, cost is higher. If you quote one and install the other, or if the homeowner expected the other, you have a dispute. Specify it on every invoice.
Note that NFRC labels must be retained for tax credit documentation
NFRC (National Fenestration Rating Council) labels come on every Energy Star certified window and certify the U-factor, SHGC, air leakage, and visible transmittance ratings. These labels are typically inside the window unit or in the box. Homeowners claiming the federal energy credit need these labels. Tell them: 'NFRC labels are attached to window units — retain all labels and keep box documentation for tax credit filing.' One sentence, one homeowner saved from a tax hassle.
Stop and document if you find rot in the rough opening framing
Full-frame replacements occasionally expose rot in the rough opening jack studs or sill framing. This is structural — proceeding without documenting it creates liability and may void any warranty on the installation. Stop, photograph the damage, note the dimensions, and get a written change order authorizing repair before proceeding. 'Structural framing repair not included — additional scope at $X per linear foot. Owner authorization required before proceeding.' Do not repair and bill after the fact.
Separate material from labor on every unit
A per-unit blended price ('window installed: $1,525/unit') is fine for a simple quote, but the invoice should break out product cost from installation labor. When a homeowner sees $12,540 in window product cost and $2,850 in installation labor, they understand where the money is going. It also clarifies what happens if a unit arrives damaged — if the product and labor are broken out, the warranty claim for the damaged unit is clear. Lump-sum per-unit pricing collapses that distinction.
Frequently asked questions
How much does window replacement cost per window in 2026?↓
Basic vinyl double-hung, insert replacement: $400–$800/window installed. Mid-range vinyl double-hung (Pella, Simonton): $600–$1,100/window installed. Premium composite or wood-clad (Andersen 400/E-Series, Marvin): $900–$1,800/window installed. Casements and awnings: $100–$300 more per unit than double-hungs of same brand. Picture/fixed windows: typically less than operable units. Full-frame replacement adds $150–$400 per window vs. insert. Whole-house replacement (10–15 windows) typically qualifies for a package discount from most contractors.
What is a U-factor and SHGC for windows?↓
U-factor measures heat transfer — how much heat flows through the window. Lower is better for insulation. Standard double-pane: 0.30–0.40. Energy Star Northern zone: ≤ 0.25. Triple-pane high performance: 0.15–0.22. SHGC (Solar Heat Gain Coefficient) measures how much solar heat comes through the glass. Lower = less solar heat gain (better for cooling climates, AC bills). Higher = more solar heat gain (can help with passive solar heating in cold climates). Northern heating climates sometimes benefit from slightly higher SHGC on south-facing windows. Energy Star designation depends on climate zone — specify both numbers on the invoice.
What is the difference between insert replacement and full-frame replacement?↓
Insert replacement: the new window unit slides into the existing frame — frames, sills, and exterior trim stay. Faster, less expensive, less disruptive. Works only when existing frames are structurally sound and square. The new unit is slightly smaller than the original opening (the insert fits inside the existing frame), which reduces the glass area slightly. Full-frame replacement: everything is removed to the rough opening and reinstalled from scratch — new frame, new exterior trim casing, new housewrap integration. More expensive and disruptive (interior and exterior patching typically required) but gives a complete fresh installation and the opportunity to update window size, style, or trim profile.
Do new windows qualify for a federal tax credit?↓
Yes — in 2026, qualifying windows and skylights may be eligible for the Energy Efficient Home Improvement Credit (Section 25C), up to $600 per year for windows. Qualifying requirements include ENERGY STAR certification (most-efficient tier or specific U-factor/SHGC values depending on climate zone). The credit is 30% of the cost of qualifying property, with annual caps. File IRS Form 5695. Keep NFRC labels and manufacturer certification statements. Consult a tax advisor — the credit rules change and vary by situation.
How long do replacement windows last?↓
Vinyl frames: 20–40 years. Wood-clad frames: 30–50+ years with maintenance. Fiberglass frames: 30–50+ years. The frame typically outlasts the glass seal — double and triple-pane insulating glass units (IGUs) can develop seal failures (fogging between panes) in 15–25 years in harsh climates, especially at south and west exposures. Most manufacturers offer separate glass seal warranties. When a sealed IGU fails, the glass unit can often be replaced without replacing the entire frame — a much lower cost repair.
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