10 Questions to Ask Before You Sign a Window Contract

Ten minutes of good questions protects a five-figure project. A quality local contractor will answer every one of these directly — hesitation, vagueness, or pressure is your answer too. Bring this list to your in-home visit.

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1. Are you licensed and insured — and can I see it?

Pennsylvania requires home improvement contractors to register with the Attorney General’s office (look for the HIC number on their paperwork). Ask for proof of liability insurance and workers’ comp. A pro hands these over without blinking; every contractor we match homeowners with has already cleared this bar.

2. Who actually does the installation?

Employees or subcontractors? Either can be fine — but if it’s subs, ask how long the crew has worked with the company and who supervises. The install determines half your window’s lifespan, so the person doing it matters more than the logo on the truck.

3. Is this quote insert or full-frame — and why?

Make them explain the install method for your home specifically. A pro will tell you what they found in your sills and frames and how that drove the recommendation. If they can’t explain why, they measured for a price, not for your house.

4. What’s the U-factor on this exact window?

Not the brochure best-case — the number for the specific product and glass package in your quote. Under 0.30 is a solid answer for Pennsylvania. A contractor who can’t answer doesn’t know the product they’re selling.

5. What does the warranty cover — parts AND labor?

Get the product warranty and the labor warranty in writing, separately. Ask if the warranty transfers to a new owner if you sell. "Lifetime" means nothing until you know whose lifetime and what’s excluded.

6. What’s included in the price?

Trim work inside and out, insulation and sealing, haul-away and disposal, permits if needed, and cleanup. Every one of these should be in the written quote. "We’ll take care of it" is not a line item.

7. How long will my quote hold?

A real quote holds for 30 days or more. A price that expires when the salesperson leaves your kitchen is a pressure tactic, not a price.

8. What happens if you find rot?

Hidden damage happens. Ask how change orders work: how you’ll be notified, how repairs are priced, and whether work stops until you approve. Pros have a clear process; pretenders improvise on your dime.

9. When do I pay?

A reasonable deposit (Pennsylvania law caps deposits for most home improvement contracts) with the balance due at completion is standard. Be wary of anyone wanting most of the money before a window arrives.

10. Can I see local work and talk to a recent customer?

Established local companies have addresses they can point to and customers happy to take a call. This is the question that separates a contractor with a Lehigh Valley track record from a crew that blew in with the storm season.

FAQ

What’s the biggest red flag?

Pressure. Today-only pricing, refusing to leave a written quote, or a salesperson who won’t leave until you sign. Quality work sells itself without a countdown clock.

Do I need permits for window replacement in PA?

Often not for like-for-like replacement, but requirements vary by municipality — and changes to opening sizes or egress windows usually do need permits. Your contractor should know your township’s rules cold and handle any permits in the quote.

How does the free match on this site help?

The contractors we match homeowners with are already vetted for licensing, insurance, and a local track record — so these questions become confirmation, not detective work. You should still ask them. A good pro respects a prepared homeowner.

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Get a free quote from a vetted local window pro

One local expert, one free in-home quote — your info is never sold to a list of contractors.

Get My Free Quote

Takes about a minute · Free · No obligation