Casement windows

A casement window is the standard and the oldest style of window in the UK. Hinged at the side (or the top) for opening, usually with a single or pair of opening windows in one frame. Casement windows in white uPVC are the most economical style of window you can buy.

The average price to supply and install a new casement window can be anything from £700 up to £1,800.

Sash windows

Usually found on period properties and buildings in London, the sash window is prized for its classic aesthetic appeal but its high maintenance compared to other windows. The window has two panels that slide up and down over the top of each other.

The cost to replace sash windows is usually 50% higher than an average 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 to replace double glazed tilt and turn windows is 25% more than a casement window.

Bay windows

Bay windows are built out from the walls of the house and can require planning permission to build to the front of the house. The bay window has windows on the front and at the sides and for these reasons, bay windows are the most expensive to replace.

To replace uPVC bay windows including install will cost 100% more than the average casement window.

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

The average cost for new aluminium windows

Aluminium window frames are popular for their durability and this makes them a solid long-term investment. Aluminium frames are popular for their durability and this makes them a solid long-term investment. They look good with slimmer frames and offer a sleeker contemporary look compared to uPVC.

The average price to supply and install new aluminium windows is 25% more than uPVC but around 25% cheaper than timber.

The average cost for new timber windows

Installing wooden windows is a long-term investment in your home as you pay a premium for the material, but they are highly desired and can add significant value to a property. Wooden windows look beautiful and authentic and are usually standard requirement for period properties and conservation areas. Nothing can compare to the stunning appeal of a newly varnished frame and the richness of real wood grain.

The average price to supply and install new wooden windows is 50% more than uPVC.

Other companies show a fixed cost for new windows – can I buy off-the-shelf windows?

You can buy windows off-the-shelf that are a standard size in limited colours and materials. But, these windows don't take into account all the problems that can arise when fitting new windows:

• Many houses have windows that are not a standard size
• Frames are not straight due to building shifts
• You might want windows to open a certain way
• You might want bespoke easy-to-reach or secure handles
• Listed properties have limitations on materials, style and colour

The cost of a new window listed on a website might seem cheap at first, but these list prices usually don't include installation. All Everest window costs are for supply and installation.

Most importantly, not all uPVC windows are built the same. There is a wide range of difference in the quality of uPVC with the cheapest being susceptible to warping and discolouration.

Beware of cheap windows

Badly-fitted windows, and badly-done home improvements can devalue a property and negatively impact the house price. Poor quality windows leave you at risk from:

• Scratches on new frames and glass
• Poor quality uPVC can warp over time
• Incorrect frame sizes that need excessive expanding foam to force fit
• Bad installation that causes damp, leaks or draughts
• Double glazing desiccant - where the double glazing seal fails and you can see bits in-between the glass
• Condensation between the glass from poor or failed seals
• Fading on the frames

Cheaper off-the-shelf windows are often not a perfect fit and to make up for this an installer will use excessive expanding foam around the edges to fill in the gaps.

This can also cause damp, draughts and shorten the life of your windows.

Be cautious of new windows prices before an installer surveys your property – a reputable window installer will need to see your home before they can give an accurate cost of windows.

It's always recommended to buy new windows from a reputable brand company that install and supply, so that they take responsibility for a perfect fit and finishing.

What should your cost of windows quote include?

When researching the average price for new windows from different suppliers make sure that you compare like-for-like. Keep in mind that prices listed on a website don't reflect the full cost of windows and all the variables.

Ask your supplier to provide a full and transparent quote that lists everything that's included from the new windows cost to installation and any aftercare and warranties they offer.

What should be included in your cost of window quote:

• A full technical survey of your property
• The sizes, styles and colours of the frames
• The materials to be used
• Type of glass to be used
• The window energy rating for the glass
• Window furniture and handles
• External window cills
• Full installation including all fixings, trims and sealants
• Disposal of your old windows

Most importantly, make sure you get a certificate to say your installer is registered with a competent person scheme, such as FENSA or Certass. This means that you have automatic approval for building regulations.