If you're considering new windows and researching double glazing costs there are many variables to consider before you can compate costs between suppliers.

For an accurate cost to install double glazing, a house requires a survey from a competent double glazing installer. Taking into consideration any complications to fitting your windows and advise on the best style of window for your property.

Plenty of websites offer lists of prices of double glazed windows, but these are usually the cost for a basic off-the-shelf window and without the cost of installation. We can't stress enough the pitfalls of buying cheap double glazing.

How much do double glazed windows cost?

To help you budget costs when making home improvements and replacing your windows, below are the costs for new double glazing windows. Note, these are for a guideline only and not actual list prices. To get accurate costs for replacing your windows you must have your property surveyed by a competent window installer first.

uPVC casement double glazing costs from £600 per window including installation

A white uPVC casement window is the cheapest type of window to buy and timber sash windows cost the most to buy.

The cost of double glazing by frame style

Casement windows

This is the standard style of window that has been fitted in the UK for hundreds of years. Casement windows open on a side hinge with either one pane opening or a pair.

The average cost of double glazing for a white uPVC casement window ranges between £600 to 1,800 including installation depending on size, glazing design and how many are being replaced in the property.

Sash windows

A beautiful and aesthetically pleasing window that can add significant value to a house. A sash window has two framed panels that slide up and down over each other.

Most often fitted in period properties and around London, many listed buildings are required to have sash windows.

The cost to double glaze a sash window is usually 50% more than a casement window.

Tilt and turn windows

The Tilt and turn window has become a hugely popular style for uPVC and aluminium windows because they can be securely left open for ventilation by tilting them inwards whilst remaining fully locked.

The cost of double glazed tilt and turn windows is usually 25% more than a casement window.

Bay windows

Bay windows extend out from the room and because of this, you require three windows instead of one.

Great for letting in lots of light and giving extra space in your living space a bay window gives you panoramic views from your house.

The cost of a double glazed bay window can be up to 150% more than a casement window.

Cost of double glazing by frame material

Apart from the style of a window, the material for the frame used also impacts on the average cost of double glazing:

uPVC windows

Unplasticised Poly Vinyl Chloride, otherwise known as uPVC, has been one of the most popular choices for double glazed windows in the UK since the eighties.

uPVC double glazing is thermally efficient, low maintenance and secure. It's also the most economical material for windows.

The average cost of double glazing for uPVC casement windows is between £600 to 1,800 depending on size, glazing design and how many are being replaced in the property.

Aluminium windows

Another easy to maintain window frame choice that's popular for it's slimline appearance.

Aluminium isn't as thermally efficient as uPVC but does offer a contemporary look and most often used in modern properties.

The cost of double glazed aluminium windows is 25% more than uPVC but 25% less than timber frames.

Timber windows

Nothing beats the look of well-maintained wooden window frames. A quality hardwood window is a good investment for a home and can add significant value, especially in period properties.

The oldest material choice of windows, timber frames can last for years if they are well looked after, but they are high maintenance and need a lot of attention.

The average cost of wooden double glazing windows is 25% more than aluminium and 50% more than uPVC.

Other options that affect the cost of double glazing

Apart from the style and material of a double glazed window, there are other factors that will impact on the cost of new double glazed windows.

Size - it might seem obvious but a large living room picture window is going to cost significantly more than a small toilet window.

This is the main reason why it's so difficult to answer the question of how much does double glazing cost.

Energy rating/quality of glass - glass might look all the same but there is a huge difference between the quality of energy efficiency performance.

When buying new double glazing look at the thermal efficiency, the solar gain and the air leakage values. A window rated at least A+ means it is highly efficient across all of the above and should be what you choose to make the investment in double glazing worth it.

Furniture and finish - door handles, locks, number of opening windows, colour and any grain effects all need to be factored into the double glazing cost.

Cheap windows might not include extras and you will need to pay more for upgrades to get the handle or locks that you want. Don't underestimate how much the finishing touches can add to a basic price.

What should your quote for double glazing include?

If you're comparing the average cost of double glazing from different companies and want to know how much does double glazing cost, make sure you are comparing like-for-like.

As we highlighted above, there are many variables to consider that can dramatically alter a price. Even factors like installing in an upper floor that would require scaffolding have to be taken into account.

If you do want to compare quotes then make sure your double glazing cost quote has the following:

• A full technical survey with drawings
• Full product details of size, style, colour etc.
• The number of windows
• The window energy rating (WER) for the glass
• Any additional features, such as handles and locks
• Does it include external window sills?
• When does the work start and finish?
• Disposal of your old windows
• Warranties for installation
• Guarantees for products
• Company details and accreditations (see below)

What double glazing accreditations and standards should I look for?

Building regulations do apply to double glazing window replacement so you must use a reputable company that is registered under the competent person scheme. They give you a certificate of completion that states your windows pass regulation otherwise you have to obtain build regulations permission yourself (at additional expense).

The accreditations to look out for include:

• Competent person scheme CERTASS
• Fenestration Self Assessment Scheme FENSA
• British Standard Institute BSI
• The Glass and Glazing Federation GGF
• Secured by Design, the official police security initiative SBD

You can read about Everest accreditations here and an explanation of CERTASS here.

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