We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies as per our policy which also explains how to change your preferences.

How to buy double glazing

Double glazing costs

By Liz Ransome-Croker

Article 2 of 5

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

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.

Before you start getting quotes for double glazing, having a clear idea of double glazing costs 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 cost for different types and sizes of double glazed windows and doors.

There are plenty of variables that affect costs 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. We’ve also spoken to experts to find out what elements can cost extra and drive up your bill.

The tables below show how much you should expect to pay for various double glazing jobs. This includes varying sizes of sash and casement windows and different materials, from uPVC to hardwood. You'll also see the prices for different types of hardwood double glazed doors and Georgian PVC doors. 

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. Click on the links below to jump down to the section you're interested in:

Only logged-in Which? members can view the information in the tables below and our advice from experts. If you're not yet a member, join Which? now to get instant access. 

You'll also be able access our exclusive double glazing company reviews - where we reveal the best and worst double glazing companies. Plus our double glazing sales and quotes, where we give tips on how to side-step common sales tricks. 

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) 60x90 90x90 90x120 120x120 180x150
uPVC casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
uPVC sash window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Hardwood casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Metal casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Hardwood double hung sash window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Table notes: Metal type is Aluminium.
Replacing double glazed windows on the second floor
Double glazed window type Prices for different sizes and types
Size (cm) 60x90 90x90 90x120 120x120 180x150
uPVC casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
uPVC sash window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Hardwood casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Metal casement window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Hardwood double hung sash window Subscriber only content Subscriber only content Subscriber only content Subscriber only content Subscriber only content
Table notes: Metal type is Aluminium.

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 tables below show prices for a range of different doors. From simple, wooden double glazed doors, to more ornate ones, such as Carolina doors - these have curved panels of glass just at the top.

You can also see prices for different grades of new ironmongery, and the cost if you use old fittings. In the bottom table, we show prices for plain uPVC doors, where a new frame and door are being added. 

New double glazed doors, refixing current ironmongery
Remove door and hang new double glazed door, refix ironmongery and decorate both sides Price
Flush (smooth) double glazed door (762mm wide) Subscriber only content
Panelled double glazed door with two glass panels made from safety glass (762mm wide) Subscriber only content
Hardwood period Carolina door with curved panels of glass at the top (838mm wide) Subscriber only content
Six panel Hemlock door (383mm wide) Subscriber only content
Table notes: These prices are for fitting a new door but not a new frame. They include adding new good quality ironmongery, as opposed refitting old ironmongery used before. All doors above are wooden, and the flush door is faced with plywood. The safety glass in this case is Georgian Wired Polished Plate glass.
New double glazed doors with new basic ironmongery
Remove door and hang new double glazed door, add new basic ironmongery and decorate both sides Price
Flush (smooth) double glazed door (762mm wide) Subscriber only content
Panelled double glazed door with two glass panels made from safety glass (762mm wide) Subscriber only content
Hardwood period Carolina door with curved panels of glass at the top (838mm wide) Subscriber only content
Six panel Hemlock door (383mm wide) Subscriber only content
Table notes: These prices are for fitting a new door but not a new frame. They include adding new good quality ironmongery, as opposed refitting old ironmongery used before. All doors above are wooden, and the flush door is faced with plywood. The safety glass in this case is Georgian Wired Polished Plate glass.
New double glazed doors with new good quality ironmongery
Remove door and hang new double glazed door, add new good quality ironmongery and decorate both sides Price
Flush (smooth) double glazed door (762mm wide) Subscriber only content
Panelled double glazed door with two glass panels made from safety glass (762mm wide) Subscriber only content
Hardwood period Carolina door with curved panels of glass at the top (838mm wide) Subscriber only content
Six panel Hemlock door (383mm wide) Subscriber only content
Table notes: These prices are for fitting a new door but not a new frame. They include adding new good quality ironmongery, as opposed refitting old ironmongery used before. All doors above are wooden, and the flush door is faced with plywood. The safety glass in this case is Georgian Wired Polished Plate glass.
Replace doors and frames with uPVC doors and frames Price
Georgian panelled white door and frame (900x2100mm) Subscriber only content
Georgian premier panelled white door and frame (900x2100mm) Subscriber only content

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.

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 2017.

SHARE THIS PAGE