How much does double glazing cost in 2026?

We’ve worked with the Royal Institution of Chartered Surveyors (RICS) to find out the average prices for various types and sizes of double-glazed windows and doors.

There are plenty of variables that affect prices, and every home is different. But our pricing research – which includes replacing windows and doors on the ground floor and also higher up – should give you an idea of how much double glazing will cost for your home.

How much do double-glazed windows cost?

Only logged-in Which? members can view the information in the tables below. If you're not yet a member, join Which? now to get instant access to our best and worst double glazing companies and how to buy double glazing.

Replacing double-glazed windows at low level

Replacing double-glazed windows at high level (not exceeding 5 metres)

If you want to find out more about the different types of double-glazed windows available, visit our page on choosing double glazing.

How much do double-glazed doors cost?

The table below show prices for different back doors and garden doors. It includes uPVC sliding patio doors, French doors and bi-fold doors.

You will also see that the costs can vary a lot depending on the quality of the ironmongery, or whether you reuse old fittings.

New double-glazed doors

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Replacement windows and doors: what adds to the cost?

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Most double-glazed windows are made bespoke. Very few properties, usually new-builds, can use ready-made windows available from DIY and trade suppliers. This means that your windows will need to be measured by a surveyor, and the glass and frames often ordered from different suppliers.

For more details on the buying process, including how to side-step common sales tricks, see our guide on how to buy double glazing. 

Use our Which? Trusted Traders search tool to find a reliable trader to install your new double glazing. 

To find out more about the comprehensive assessment a company must pass to become a Which Trusted Trader, see our guide to independent double glazing companies. 

How will you pay for double glazing?

Before you agree to any double glazing installation, make sure you understand how payment will work. In particular, your contract should make clear whether you are paying in instalments and, if so, when these are due.

It’s not unusual to pay an instalment upfront, especially if it’s a big job. But you should only pay the last instalment when you're satisfied that the work is completed to a satisfactory standard and all terms of your contract have been met.

Financing options for double glazing

We asked nine Which? Trusted Trader double glazing installers for their views on financing options when buying windows. 

Several told us they don't offer financing and that often customers find a better option is to get a bank loan or use a 0% credit card.

‘We do not offer financing,' said Daina Rawlings, from The Window Doctor Care and Repair Service. 'However, we do take a 50% deposit on quotes for glass units, door panels or that total over £1,000. We find customers actually prefer this as it breaks up the cost.’  The company doesn’t install new windows but repairs existing uPVC and aluminium windows and doors.

Some of the traders we spoke to did offer direct financing options.

If you would like to have a financing option directly from the company that installs your windows, James Gaft from Balhousie Glazing offered a checklist for what a good financing agreement should look like:

• It should be clear, transparent and make home improvements more manageable without adding confusion or pressure to the buying process.
• Customers should easily understand the interest rate, total amount repayable, monthly payments and the length of the agreement before committing. 
• There should be no hidden fees or complicated terms buried in the small print.
• Finance should support your decision, not drive it. 
• Customers should never feel pressured into signing up on the spot. 
• A responsible company will give homeowners time to consider their options and make sure the payments are affordable.

Money-saving tips for double glazing

1. Keep your plans simple. White uPVC, with standard double-glazed A-rated glass, is usually the most economical option.
2. If you need to make a repair, replace just the glass if possible. Sometimes steamed-up windows can be caused by a fault with the glass, rather than the whole window. So it’s possible to replace only the glazed unit rather than the whole thing.
3. Shop around for quotes. We recommend at least three. Don’t accept the first quote you’re given by a salesperson, especially if they put you under pressure. Instead, haggle and ask them for their best price. Read our tips on how to buy double glazing to get the best price and avoid sales tactics.
4. Compare quotes fairly. Make sure you get quotes for like-for-like windows from different firms so you can compare them accurately. Don’t be side-tracked by ‘extras’ added on that obscure the true cost.

What our calculations are based on

To arrive at these average costs, the Royal Institution of Chartered Surveyors (RICS) uses cost data from its Building Cost Information Service database, where costs are collated from a variety of sources and analysed.

Everything needed to carry out the work is included in the costs, such as labour, materials, any preliminary work, contractor overheads and profit, and VAT.

Materials costs are based on the best trade prices from a range of suppliers across the UK, which are then benchmarked to reveal the best national average. Labour rates are based on the current Building and Allied Trades Joint Industrial Council wage agreement. It then uses this data in a standardised model of the average double-glazed window and door types and sizes. Data copyright RICS 2025, reproduced with permission. Data was last updated in November 2025.