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30 June 2021

Double glazing costs

We reveal the typical prices of double-glazed windows and doors, so you don't get caught out and overcharged when you get double glazing quotes.
SI
Sarah Ingrams
Double glazing windows and doors 442763

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 the average prices for various types and sizes of double-glazed windows and doors (autumn 2020).

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.

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.

How much do double-glazed windows cost?

When you know how much you expect to spend, take a look at the major double glazing brands rated and independent glaziers to choose where to buy.

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.

Replacing double-glazed windows on the ground floor

Double glazed window type
Prices for various sizes in mm including 600x900, 900x900, 900x1,200 and 1,800x1,500
uPVC casement window
uPVC single-hung sash window
uPVC 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 various sizes in mm including 600x900, 900x900, 900x1,200 and 1,800x1,500
uPVC casement window
uPVC single-hung sash window
uPVC 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 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

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

Double-glazed door types
Reusing ironmongery
New basic ironmongery
New good-quality ironmongery
uPVC sliding patio door - one fixed panel and one sliding panel - white (1,800 x 2,100mm)
uPVC sliding patio doors - one fixed panel and one sliding panel - white (3,000 x 2,100mm)
uPVC French door (1,490 x 2,090mm)
uPVC 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. In particular, 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're 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, 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. Prices correct as of October 2020.