Blog · Choosing an installer
How to Compare Window Replacement Quotes, Line by Line
A line-item template for comparing window replacement quotes like for like - brand and series, glass, install method, trim, disposal, permit and payment schedule.
Window replacement quotes can only be compared when they describe the same job. Two quotes for "ten vinyl windows" may differ by thousands of dollars because one includes new exterior trim, disposal and a permit and the other does not, or because the windows, the glass or the installation method are different. The fix is to put every quote into the same line items before you look at the totals.
The Federal Trade Commission says a written estimate should describe the work, the materials, the completion date and the price, and suggests asking for an explanation when estimates are far apart rather than choosing a bid on price alone 1. The template below is a way to do exactly that for a window job.
Why window quotes are hard to compare
Three things move a window price more than anything else, and installers do not always name them:
- The product. Each brand sells several series at different price points, and within a series the frame material, style and size all change the price.
- The glass package. Double or triple pane, the low-E coating and the gas fill change both price and performance.
- The installation method. An insert sets a new window inside the old frame; a full-frame installation removes the old window down to the rough opening. HomeAdvisor reports labor of $150 to $800 per window for full-frame installation and $100 to $300 for retrofit (insert) installation 4. See full-frame vs. insert replacement for when each fits.
Around those sit the extras that are easy to leave out of a quote: trim, exterior capping, disposal, rot repair, the permit and second-story access.
The line-item template
Ask each company to fill in, or confirm, every row. Where a quote is silent, write "not stated" and ask.
| Line item | What to write down | Why it matters |
|---|---|---|
| Company and license | Legal name, address, license or registration number and issuing agency | Lets you check the company on your state or local lookup |
| Brand and series | Exact series name for each window | Series within one brand differ in frame, features and warranty |
| Frame material and style | Vinyl, fiberglass, wood, clad wood or aluminum; double-hung, casement, slider | Changes price and what can be compared |
| Size and count | Each opening, by room | Confirms every quote covers the same windows |
| Glass package | Panes, low-E coating, gas fill, tempered or laminated where needed | Drives performance and price |
| U-factor and SHGC | From the NFRC label for each window type | Lets you compare performance with numbers, not adjectives |
| Installation method | Insert or full-frame, per opening | Changes labor, trim work and what can be inspected |
| Rot and repair | Whether repair is included, and the unit price if rot is found | Avoids a surprise once the old window is out |
| Interior trim | Reuse, replace or none | Often left out of lower quotes |
| Exterior trim and capping | Aluminum or vinyl capping, new brickmold, caulking | Weather seal and appearance |
| Removal and disposal | Included or a separate charge | Some installers charge separately |
| Permit | Who pulls it, and whether the fee is included | Requirements vary by city |
| Lead-safe work | For homes built before 1978, whether the firm works under EPA's RRP rule | Ask whether EPA's RRP rule applies to the job |
| Manufacturer warranty | Length for frame, glass and hardware, labor terms, transferability | Coverage differs by brand and series |
| Installation warranty | Length and what the installer covers | Separate from the product warranty |
| Dates | Lead time for the order, start date, days on site | Lets you hold the company to a schedule |
| Payment schedule | Deposit, progress payments, final payment trigger | Protects you if the job stalls |
| Total | Price for the whole scope above | Compare only after every row matches |
Reading the glass lines
The NFRC label gives the numbers you need to compare glass packages across brands. A lower U-factor keeps more heat in, and the label's range for windows runs from 0.20 to 1.20; the Solar Heat Gain Coefficient runs from 0 to 1, with lower values blocking more of the sun's heat 2. If a quote lists only marketing names for the glass, ask for the U-factor and SHGC of each window type.
For context, ENERGY STAR Version 7.0 sets a U-factor of 0.22 or lower for windows in the Northern zone and 0.32 or lower in the Southern zone, with an SHGC of 0.23 or lower in the South-Central and Southern zones 3. Two quotes that both say "ENERGY STAR" can still carry different numbers. The U-factor guide and low-E glass explained go further.
Checking the totals against published ranges
Once the line items match, it can help to see where a quote sits against published per-window figures. These surveys measure different things, so they do not agree:
| Source (date) | Per-window figure | Range reported |
|---|---|---|
| HomeAdvisor (updated June 17, 2026) | $850 average | $300 to $2,100 4 |
| Angi (updated October 15, 2026) | $750 average | Project average $7,348, most projects $3,436 to $11,838, from 17,857 projects 5 |
| Fixr (updated January 21, 2026) | $800 average | $450 to $1,200 typical 6 |
| HomeGuide (updated February 5, 2026) | $900 | $450 to $1,500 7 |
The differences come from method. HomeAdvisor says it surveys customers after a project and pairs that with Bureau of Labor Statistics data and expert interviews 4; Angi bases its figures on verified projects from its own pros 5; Fixr cites pricing databases, contractors and industry experts 6; and HomeGuide's headline range is for a single-hung window installed 7. None of them knows your windows, so treat them as a sense of scale, not a benchmark for your quote. The window replacement cost guide covers them in more depth.
The surveys also show where hidden lines tend to sit. Fixr puts permit fees at $50 to $300 and says some installers charge separately for haul-away 6. Angi says most contractors include removal and cleanup, but some charge $55 to $65 an hour for disposal and extra labor 5. HomeGuide says the window unit makes up 65% to 75% of the replacement cost and labor the remaining 25% to 35% 7.
Payment schedule
The payment line deserves the same attention as the price. The FTC advises against paying the full amount up front and against making the final payment until the work is done and you are satisfied 1. Some state agencies give numbers: California's CSLB cautions that a down payment should not exceed 10 percent of the contract price 8, and Virginia's Board for Contractors recommends about 10% of the contract, or about 30% when the job requires custom-made items 9. Replacement windows are usually made to order, so ask what the deposit covers and when the windows will be ordered.
When one quote is much lower
Before choosing a low quote, check which rows it leaves out. A lower total often means a different series, no trim or capping, an insert where others quoted full-frame, disposal billed separately, or no allowance for rot. Ask the company to price the missing items so the totals line up. If it cannot or will not put them in writing, that is useful information too. How to choose a window installer lists the questions to ask and the red flags to watch for.
FindAWindowPro is a lead-generation service, not an installer, and it is paid by window companies when a reader requests quotes. If you want more quotes to put in the template, you can compare quotes from window installers.
About these figures
- 1 Official record: FTC guidance on what a written estimate should include, comparing estimates, and payment timing, checked October 22, 2026.
- 2 Official record: NFRC label ranges for U-factor (0.20 to 1.20) and SHGC (0 to 1), checked October 22, 2026.
- 3 Official record: ENERGY STAR Version 7.0 U-factor and SHGC limits by climate zone, checked October 22, 2026.
- 4 Reported: HomeAdvisor per-window average and range, full-frame and retrofit labor ranges, and its survey method, updated June 17, 2026, checked October 22, 2026.
- 5 Reported: Angi per-window and project figures, project count, and disposal charges, updated October 15, 2026, checked October 22, 2026.
- 6 Reported: Fixr per-window average and range, permit fee range and haul-away note, updated January 21, 2026, checked October 22, 2026.
- 7 Reported: HomeGuide per-window average and range and the unit-versus-labor split, updated February 5, 2026, checked October 22, 2026.
- 8 Official record: CSLB caution that a down payment should not exceed 10 percent, checked October 22, 2026.
- 9 Official record: Virginia Board for Contractors down payment recommendations of about 10% and 30%, checked October 22, 2026.
Sources
- How To Avoid a Home Improvement Scam, Federal Trade Commission (Official record). Checked October 21, 2026.
- The NFRC Energy Performance Label, National Fenestration Rating Council (Official record). Checked October 21, 2026.
- ENERGY STAR Version 7.0 Residential Windows, Doors and Skylights Criteria, U.S. Environmental Protection Agency, ENERGY STAR (Official record). Checked October 21, 2026.
- How Much Does Window Replacement Cost?, HomeAdvisor (Other). Checked October 21, 2026.
- Window Replacement Cost, Angi (Other). Checked October 21, 2026.
- How Much Does Window Replacement Cost?, Fixr (Other). Checked October 21, 2026.
- How Much Does Window Replacement Cost?, HomeGuide (Other). Checked October 21, 2026.
- Handyperson Exemption to Increase to $1,000 in 2025 (CSLB #24-21), California Contractors State License Board (Official record). Checked October 21, 2026.
- Statement of Consumer Protections, Virginia Department of Professional and Occupational Regulation, Board for Contractors (Official record). Checked October 21, 2026.