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Double glazing buying advice

This buying advice covers double glazing in the order you buy: before quotes, comparing quotes, choosing an installer, signing the contract, and what to do if a company fails. We are a free quote-matching service, not an installer.

Stage 1

Before you get quotes

Check timing and permission before any installer visits.

The best time of year to buy double glazing

When to get quotes and when to book the fitting, with lead times, weather and building-regulation sign-off.

Read the guide Replacing windows in a leasehold flat

Who is responsible for the windows in a leasehold flat, and the permission you need before you ask for quotes.

Read the guide

Stage 2

Getting and comparing quotes

Line up the written quotes and question each installer on the same points.

How to compare double glazing quotes

A checklist for lining up quotes like for like: windows, glass rating, scheme registration and guarantee.

Read the guide Questions to ask a double glazing salesman

The questions to put to every installer at the survey, plus the red flags that mean walk away.

Read the guide

Stage 3

Choosing an installer

Run the same checks on every installer before you agree to a survey or sign anything.

How to choose a double glazing installer

Nine checks on any installer, what a proper survey covers, and the sales tactics to walk away from.

Read the checks

Stage 4

Signing the contract and your rights

Read the contract, the deposit terms and your cancellation rights before you sign.

Double glazing contract checklist: what to check before you sign

Quote validity, the fitting date and payment stages: the terms to check line by line.

Read the guide How much deposit should you pay for double glazing?

How large a deposit to agree to, and how to protect the money you pay up front.

Read the guide Double glazing cooling off period

When you get a 14-day right to cancel, why made-to-measure windows can be an exception, and when the period runs up to 12 months longer.

Read the guide

Stage 5

If something goes wrong

Know what protects your deposit and guarantee if the installer stops trading.

What happens if your double glazing company goes bust

What happens to your deposit and guarantee, and why an insurance-backed guarantee matters.

Read the guide

Related pages

Window replacement in London

Stage 1: decide repair or replace before you ask for quotes.

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Double glazing in Newcastle upon Tyne

Stage 1: Tyneside flats share one front, so consent comes before quotes.

See Newcastle quotes

Double glazing quotes in Nottingham

Stage 2: landlords need the window energy rating on every quote for the 2030 EPC deadline.

See Nottingham quotes

Oxford double glazing quotes

Stage 1: listed homes need consent before any quote.

See Oxford quotes

Prices and product guides

Prices, calculators and product explainers live on our sister site: see the double glazing cost and product guides on DoubleGlazingCostCalculator.co.uk. Replacing period windows? See our page on sash window replacement.

Only the glass or a lock has failed? Our window replacement Manchester page shows when a repair is enough.

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