How to compare window quotes

Getting three window quotes is easy. Comparing them properly is where most homeowners come unstuck — because two quotes for “the same” job can describe very different work at very different quality. This hub pulls together the method: how to line quotes up like‑for‑like, what every figure should include, and the warning signs worth a second look before you sign anything.

The single biggest mistake is comparing on the headline number alone. A lower price usually buys a lower‑specification job — thinner glass, a cheaper frame profile, fewer opening casements, or extras such as scaffolding and “making good” quietly left off. Until every quote lists the same specification in writing, the totals simply aren’t comparable.

The comparison method, step by step

1. Agree one specification first. Decide the glass type, frame material, colour and the number of opening windows you want, then ask every installer to quote for exactly that.
2. Get everything in writing. A verbal figure on the doorstep is not a quote. Ask for an itemised written quotation you can hold the installer to.
3. Line the quotes up field by field. Same glass, same frames, same unit count, same guarantee, same VAT treatment. Differences jump out fast.
4. Question the outlier. When one number is a lot lower — or a lot higher — find out why before you decide.
5. Check the firm, not just the figure. FENSA or CERTASS registration, an insurance‑backed guarantee and clear deposit terms matter as much as the price.

Work through the guides

Each guide below tackles one part of comparing quotes well. Start with the checklist, then use the others as questions come up.

• What to check in a window quote — the full checklist to run over every quote you receive.
• Window quote red flags — the warning signs that a quote, or a firm, is best avoided.
• How many window quotes to get — how many is enough to compare well without dragging it out.
• Understanding your window quote — plain‑English meaning behind the jargon and line items.
• Questions to ask window installers — what to ask a fitter before you commit.
• Online vs in‑home quotes — when a doorstep survey beats an online estimate.
• Deposits, contracts & protection — deposit protection, contract terms and your rights.
• Negotiating window prices — how to negotiate fairly once you’ve compared.
• Compare window quotes online — comparing online, then requesting quotes locally.

Why like‑for‑like wins

Windows are a considered purchase you’ll live with for twenty years or more, so value matters far more than the lowest number today. When every quote describes the same glass, the same frames and the same aftercare, the price gap tells you something real — and you can choose with confidence rather than crossing your fingers. That is the whole point of comparing the right way.

When you’re ready, tell us your postcode and we’ll match you with vetted, accredited local installers who can quote for your project. Every quote is free and there’s no obligation to proceed.