How to hire a window company without getting burned
Window sales has a particular reputation, and it is earned honestly by a segment of the industry that runs on long in-home presentations and prices that mysteriously drop the moment you hesitate. None of that is required to buy good windows. Here is what to check before anyone comes out, how to read a quote once you have one, what you are entitled to after you sign, and what to do at the end of the job before the final payment goes out.
Verify before anyone comes out
The license, in their name. Ask for the number and check it with your state licensing board directly rather than trusting a certificate they hand you. Requirements differ by state and sometimes by city, so look up what yours actually requires for window work instead of assuming.
Insurance sent directly by the carrier. General liability and workers' compensation both matter. If a worker is hurt on your property without comp coverage, that liability can land on you. Ask for the certificate to be sent by the insurance company or agent, not handed over by the salesperson.
A real, checkable business history. A company that has been doing installs in your area for years has a paper trail. One that appeared recently under a new name does not, and that pattern is common enough in this trade to be worth checking.
Lead-safe certification if your home is older. If the house was built before 1978, federal rules require a paid contractor who disturbs painted surfaces, which includes replacing windows, to be EPA lead-safe certified and to follow lead-safe work practices. Window replacement is not exempt from that requirement the way some minor repairs are. Ask for the firm's certification; a contractor who has never heard of it is telling you something. The Philadelphia page covers how this plays out in a city full of pre-war rowhouses.
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How to read a quote line by line
A useful quote is written opening by opening, not as a lump sum. For each window it should name the frame material, the manufacturer and product line, the size, the style, and the glass package, ideally with the NFRC performance numbers rather than a marketing name. If you are unsure what those choices mean, our materials and glass guide explains them in plain terms.
Then look at what is around the window. Does the quote say whether each opening is a full-frame or an insert replacement? Does it cover interior trim and exterior capping, disposal of the old units, and any lead-safe work? Is the permit included, and who is responsible for it? Two quotes with the same bottom line can describe very different jobs, and the difference is almost always in these lines.
Compare quotes by laying them side by side and checking that each one covers the same list of things. A quote that leaves items out is not cheaper; it has simply not told you the rest of the price yet. For where the money in a typical quote goes, see what replacement windows actually cost.
The tactics that should end the conversation
A price that gets lower the longer you hesitate or the more you say no. If the number can come down, it always could have. That is a negotiation tactic dressed up as a discount, not a real quote.
“This price is only good if you sign tonight.” A real number holds for at least a week. Urgency is what people substitute for a case that does not otherwise hold up.
A four-hour in-home presentation before you see a number. You are allowed to ask for the price and the specifics up front and end the appointment if you do not get them.
Energy-savings numbers that sound too good. Be skeptical of any pitch built around a large, precise annual dollar savings figure — real savings exist but they are modest, and an inflated number is a sign of a sales script, not an engineer. Our guide on whether new windows save money shows what realistic expectations look like.
Financing presented before the price. A monthly payment is not a price. Ask for the total cash price in writing first, then compare it to the total you would pay on the financing offered. Some programs build the lender's fees into the contract price, and a promotional rate can make a higher number look like a deal.
What belongs in the contract
Scope specified per opening, not as a lump sum for “the house.” Full-frame or insert stated explicitly for each window — see what that distinction actually means if a quote doesn't spell it out. The flashing and installation method described, not just implied. A payment schedule tied to milestones rather than dates, with a deposit that is a fraction of the total, not half or more up front. Who pulls the permit, named — and whether they've actually pulled one in your specific city before, not just a neighboring one; permit rules vary enough between the cities we cover that assuming they transfer is a real mistake. And the workmanship warranty term in writing.
Also worth writing in: a start date and an expected duration, what happens to the old units and debris, what the contractor will do if rot or water damage turns up once the old window is out, and how any added cost would be approved before work continues. Our timeline guide sets out what a realistic schedule looks like.
None of this is an unusual ask. How a company reacts to being asked for it tells you more than their answer does.
Your right to cancel, and what happens if the contractor does not pay suppliers
If you sign a contract at home, the federal Cooling-Off Rule generally gives you three business days to cancel a sale over $25 made in your home, and the seller is required to tell you so and hand you a cancellation form. Some states add protections beyond that. Do not let anyone ask you to waive it, and do not let the work start before the window has passed unless you are comfortable with that.
A second protection is less well known. In most states, if a contractor fails to pay a supplier or subcontractor for work on your house, that party can file a lien against the property, and you can end up in a dispute over a bill you already paid. Ask whether the company will provide lien waivers as you make payments, and check how your state handles this.
The warranty question worth asking directly
There are two warranties and they get conflated on purpose sometimes. The manufacturer warranty covers defects in the window unit itself and usually prorates down over time. The installer's workmanship warranty covers the install — the flashing, the sealing, the fit in the opening — and that is the one that actually matters, because most window problems trace back to installation rather than a defective unit.
Ask specifically how long the workmanship warranty runs, what voids it, and whether it transfers to a new owner if you sell the house. Ask who you call, and how quickly someone has to respond. A warranty is only as good as the company that stands behind it, which is one more reason a long local track record matters.
Before you make the final payment
Walk every window with the crew lead. Open and close each one, check the locks, look at the caulk and trim from inside and out, and check that nothing has been scratched or left dirty. Write down anything that needs fixing, and agree on a date for it before the last payment goes out.
If a permit was pulled, confirm the inspection happened and keep the sign-off. Keep the window labels until any inspection is finished, since an inspector may want to see them. Then file the contract, the permit, the warranty documents and the product information together, so that they are easy to find if you ever sell or need service.
Common questions
Should I get more than one quote?
Two or three is enough if you compare installation method, flashing detail, and warranty terms rather than just the bottom line number.
Is the cheapest quote ever the right choice?
Sometimes, but find out why it's cheapest first. The gap is usually in the install method, the trim and finish work, or the warranty, not in some efficiency the lower bidder found.
How much of a deposit is normal?
A modest deposit to cover material ordering is standard. Anything approaching half the total, or full payment up front, is outside the norm and worth questioning.
Can I cancel after I sign a window contract?
For a sale made in your home, the federal Cooling-Off Rule generally gives you three business days to cancel a purchase over $25, and the seller must give you written notice of that right. Some states give more time, so check yours.
Does my contractor need to be lead-safe certified?
If your home was built before 1978 and you are paying a contractor to replace windows, federal rules require the firm to be EPA lead-safe certified and to follow lead-safe work practices. Ask to see the certification.
Who is responsible for getting the permit?
It should be named in the contract. Many companies pull it for you, but the rules differ from city to city, so ask whether they have done it in your specific city and who pays the fee.
What should I do if the company wants a large payment before starting?
Ask for a payment schedule tied to milestones instead, such as materials ordered, installation complete, and final walkthrough. A large up-front payment leaves you with little leverage if something goes wrong.
How do I tell a real workmanship warranty from a vague one?
A real one is in writing, states a number of years, says what is covered and what voids it, and says whether it transfers if you sell the house. If you cannot find those details on paper, assume they do not exist.
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