Written & reviewed by Jason Verdelli
Founder of WindowGuide · 20+ yrs in home remodeling consumer research · Editorial standards · Reviewed July 3, 2026
3
Quotes to get
Retailer, regional, independent
10–30%
Typical deposit
Anything more is a flag
7 d
Quote should hold
In writing, minimum
0
Homeowner-pulled permits
Contractor should pull it
Licensing, insurance, and who shows up
- What's your state license or registration number, and can I verify it online?
- Do you carry general liability and workers' compensation? Can I get the certificate directly from your insurer?
- Are the installers your employees or subcontractors, and who supervises them on site?
- Are your crews lead-safe (EPA RRP) certified for my pre-1978 home?
- Who is my point of contact once the sale is done?
These have right and wrong answers
License number, insurance certificate direct from the insurer, lead-safe certification on a pre-1978 home, and who pulls the permit. There's no acceptable "we'll get that later" here.
The product and the numbers behind it
- What manufacturer and series exactly, and what's the U-factor and SHGC on the glass package quoted?
- Is this an insert or a full-frame replacement, and why that choice for my openings?
- What happens if you find rot at tear-out, and what's the per-opening price for that repair?
- How is the gap insulated, low-expansion foam or fiberglass batt?
- What exterior trim or capping is included, and in what color?
Get the rot clause in writing
Rotted sills show up at tear-out, not at the measure. Ask for a per-opening repair price up front so it isn't a blank-check change order on install day.
Warranty terms that actually matter
Nearly every company advertises a lifetime warranty. The questions are what's covered, who honors it, and whether labor is included, because a free sash with a $250 service call isn't a lifetime warranty in practice.
- Is the glass seal warranty transferable to a future owner, and is there a transfer fee?
- How many years of labor are covered on the installation itself?
- Is there a service-call fee for warranty visits?
- Who handles the claim if the manufacturer stops making this series?
Price, deposit, and pressure tactics
A price that's only good if you sign tonight is a sales tactic, not a discount. Legitimate window companies hold a quote for at least a week and will put the same number in writing tomorrow.
- Is this price good for at least 7 days in writing?
- What's the deposit, and what does it cover?
- Is the quote itemized per opening, or one lump sum?
- What's the payment schedule, and is final payment due after final inspection?
- Have you pulled permits in my municipality before?
Red flags
- Discount that expires when the salesperson leaves your kitchen table
- No physical local address or no verifiable license number
- Ordering units off the sales-visit measurement with no technical measure
- Deposit above 30–50% of contract value on a standard residential job
- Refusal to name the manufacturer and series, or to show NFRC label numbers
- Asking the homeowner to pull the permit
Window contractor red flags at a glance
| Flag | What it usually means |
|---|---|
| Price expires tonight | High-pressure sales model, not a discount |
| No verifiable license | Unlicensed work; voids insurance and resale disclosures |
| No technical final measure | Mismeasures and multi-week reorders |
| Wants > 30–50% deposit | Cash-flow issue; your money funds another job |
| Won't name manufacturer or series | You can't compare quotes or verify NFRC numbers |
Ready to turn this into a plan for your window project? I'll walk you through a short guided conversation and hand back a personalized project profile you can use to compare quotes fairly.
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Frequently asked questions
How many window quotes should I get?+
Three. One national retailer or dealer, one established regional company, and one local independent installer. That spread shows you the real price band for your openings and exposes an outlier fast.
Should I use the manufacturer's own installers or an independent?+
Either can be excellent. What matters is whether the crew is employed and supervised by the company you signed with, and whether installation labor is warranted separately from the product.
How much deposit is reasonable for a window job?+
10–30% is standard because units are custom-built to your measurements. Some states cap contractor deposits by law. Anything above 30–50% up front on a standard residential job is worth questioning.
Is a lifetime warranty on windows real?+
Sometimes, but read the terms. Check whether labor is included, whether service calls carry a fee, and whether the coverage transfers to a buyer, since transferability is what shows up at resale.
Keep planning your window project
2026 Window Trends
A cited research report on what homeowners are installing in 2026, what it costs, and how it varies by region.
Energy-Efficient Windows
How to read U-factor and SHGC, which glass packages actually cut bills in your climate, what ENERGY STAR certification requires, and honest per-opening cost ranges for efficient replacement windows.
Vinyl vs. Fiberglass Windows
A straight comparison of vinyl and fiberglass replacement windows: real per-opening cost, expected lifespan, color options, performance in heat and cold, and which one holds value at resale.
Double vs. Triple Pane
When triple-pane glass is worth the upcharge and when it isn't: U-factor differences, real energy savings, noise reduction, weight and hardware issues, and cost per opening.
Window Replacement Timeline
From measurement to final caulk: how long window replacement really takes, why the wait is manufacturing lead time rather than install time, and what happens on install day.
Questions to Ask a Window Installer by state
Questions to Ask a Window Installer in Pennsylvania
State-specific Pennsylvania context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Maryland
State-specific Maryland context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Virginia
State-specific Virginia context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in North Carolina
State-specific North Carolina context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in South Carolina
State-specific South Carolina context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Georgia
State-specific Georgia context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Florida
State-specific Florida context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Tennessee
State-specific Tennessee context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Texas
State-specific Texas context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Arizona
State-specific Arizona context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Colorado
State-specific Colorado context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Utah
State-specific Utah context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Massachusetts
State-specific Massachusetts context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Ohio
State-specific Ohio context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Kentucky
State-specific Kentucky context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Indiana
State-specific Indiana context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Michigan
State-specific Michigan context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Missouri
State-specific Missouri context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Iowa
State-specific Iowa context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Oklahoma
State-specific Oklahoma context: permits, licensing, and local considerations.
Questions to Ask a Window Installer in Alabama
State-specific Alabama context: permits, licensing, and local considerations.
Also on your list?
- Planning a bathroom remodel?Waterproof floors are one piece — price the whole bathroom. — BathGuide
- Picking flooring for a wet room?Waterproof options that hold up to bathroom moisture. — FloorGuide
- Doors and thresholds on the list too?Entry, patio, and interior doors with real install costs. — DoorGuide
Ready to see your remodel profile? WindowGuide is a 2-minute guided conversation, not a contractor form, you'll see your personalized plan before sharing anything. Matching with a local provider is optional.
Start your free WindowGuide
See your personalized remodel plan in 2 minutes
Tell me a bit about you and I'll tailor the plan to your home and budget. No pressure, no obligation.
Private · no commitment · 2 minutes