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5 October 2020

Double glazing prices

We reveal the typical cost of double-glazed windows and doors, so you don't get caught out and overcharged when you get double glazing quotes.
Double glazing windows and doors 442763
LR
Liz Ransome-Croker


Before you start getting quotes for double glazing, having a clear idea of how much it should cost will help ensure you don't pay more than you need to.

That's why we’ve worked with the Royal Institution of Chartered Surveyors (RICS) to find out what the average price is for different types and sizes of double-glazed windows and doors (autumn 2019).

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 level and also higher up – should give you an idea of what to expect to pay.

The tables below show how much you should expect to pay for various double glazing jobs. We've also got tips from double glazing experts to help you understand what hikes the price of double glazing and how you can therefore cut costs.

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 double glazing company reviews and double glazing sales and quotes.

How much do double glazed windows cost?

Replacing double glazed windows on the ground floor
Double glazed window type Prices for different sizes and types
Size (cm) 600x900 900x900 900x1,200 1,200x1,200 1,800x1,500
PVCu casement window
PVCu single-hung sash window
PVCu double-hung sash window
Aluminium casement window
Aluminium single-hung sash window
Aluminium double-hung sash window
Hardwood casement window
Hardwood single-hung sash window
Hardwood double-hung sash window
Replacing double glazed windows on the second floor
Double glazed window type Prices for different sizes and types
Size (cm) 600x900 900x900 900x1,200 1,200x1,200 1,800x1,500
PVCu casement window
PVCu single-hung sash window
PVCu double-hung sash window
Aluminium casement window
Aluminium single-hung sash window
Aluminium double-hung sash window
Hardwood casement window
Hardwood single-hung sash window
Hardwood double-hung sash window

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 windows cost?

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

You can also see from these prices that the costs can vary a lot depending on the quality of the ironmongery, or whether you use old fittings.

Log in now or join Which? to see the prices in the table.

New double glazed doors
Double glazed door types Reusing ironmongery New basic ironmongery New good quality ironmongery
PVCu sliding patio door - one fixed panel and one sliding panel - white (1,800 x 2,100mm)
PVCu sliding patio doors - one fixed panel and one sliding panel - white (3,000 x 2,100mm)
PVCu French door (1,490 x 2,090mm)
PVCu external Bi-Fold doors (1,790 x 2,090mm)

Replacement windows and doors: what adds to the cost?

To view these tips from experts, Which? members can log in, or you can join Which? now for access to all our reviews and advice.

How will you pay for double glazing?

Before you agree to any double glazing installation, make sure you understand how payment will work. Will you pay in instalments? This should be made clear in your contract.

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

Money saving tips for double glazing

We asked experts, installers and homeowners for their tips on how to keep the costs of double glazing down. 

Which? members can log in, or you can join Which? now for access to all our reviews and advice.

What our calculations are based on

To arrive at these average costs, 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.

Material 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. Prices correct as of September 2019.

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