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Sash Windows Costs

Everything you need to consider that can affect the cost of sash windows.

Sash windows are a specialist window style, often chosen for period and character properties, and their cost can vary more than standard window designs.

The guide prices on this page are based on replacement Everest sash window ranges and typical UK installations, helping you understand what affects the cost and why prices differ depending on design, specification and fitting requirements.

Because there are many variables involved in replacing sash windows, it isn’t possible to provide a fixed list price. Instead, the guide prices on this page are designed to help you understand what affects the cost of new sash windows and what to consider when planning your installation.

The cost of new sash windows 2026

The cost of new uPVC sash windows is between £2,500 to £4,000 per window

The cost of new wooden sash windows is between £3,000 to £5,000 per window

The prices above are guide prices and dependent on many factors, such as materials, style of frames, finishes, amount of windows ordered and the complexity of your installation.

Sash window materials

The two types of sash window material both offer their own benefits and are suitable for different types of properties and projects depending on your specific needs.

uPVC sash windows

Due to its energy efficiency, low maintenance and lower cost, uPVC is an excellent choice for many properties, especially Victorian terraces that don’t have any conservation restrictions.

Everest sash windows are also available in woodgrain foil finish that offers the benefit of low maintenance uPVC, but looks like wood.

Wooden sash windows

Nothing looks more beautiful than wooden window frames, but they do require considerable maintenance.

For some properties in conservation areas, or listed buildings, there will be a requirement to replace windows like-for-like with wooden frames. Many city centres such as London, Leeds and Edinburgh for example have conservation areas that only allow wooden sash window frames.

Wooden sash windows can cost 50% more than uPVC.

Other factors that affect the cost of sash windows

Apart from the obvious frame material and glazing options, there are also plenty of other choices you need to consider when configuring your perfect window. All of these will make a difference to the cost, so when you compare your prices, make sure you are comparing like-for-like to cover all of these.

Number of Windows: When ordering windows, due to installation there is economy at scale. The more you order, the cheaper each window will be. Only one window would be more expensive than the cost per window when installing ten windows.

Decorative glass: another option to consider is the inclusion of decorative glass in your windows. For example, privacy glass in bathrooms or overlooked rooms. Or, decorative patterns that echo Edwardian and Victorian styling.

Furniture and accessories: To complement Georgian styling, Georgian bars and sash horns can be applied to the frames. Also, think about the hooks, lifts and sash restrictors, which all will impact the final cost of the sash window.

Dual colour and finishes: for uPVC and wooden frames, there is an option of having the frame coloured differently on the outside and inside so you can match interiors and exteriors. uPVC also has an option of a woodgrain foil finish.

Our sash windows include the full sash box

Sash windows comprise the sliding sashes and a box frame they are contained within. The box houses the mechanics of the windows so they can slide up and down. Older windows can use a cord and pulley and others are spring loaded.

At Everest, our sash windows are made as a full set that includes the sashes and the box. We remove the old sash box and complete a professional install of the full unit.

Sash box removal is complex and more time consuming than the replacement of a casement window frame. This does increase the installation cost. When you do get a quote, check that full sash box removal and window sill replacement is included.

Some companies offer to replace the sash only part of your window. From experience, this is not the best option to take. As an investment, it is far better to have the full sash window and box replaced at the same time.

Boxes and frames warp or drop over time and trying to fit new sashes into an older box will cause issues in the installation. Your windows might stick and be difficult to slide open. They will also never reach the maximum energy efficiency or performance as the gaps between the frames and the box cannot be made perfect.

At Everest, we only recommend replacing a full unit of sash and box together for the longevity of the window, the energy efficiency and the performance.

What should your sash windows quote include?

When researching the cost of your sash windows and comparing quotes from different companies, always make sure you compare like-for-like.

As mentioned above, look out for added extras from box sash removal, to furniture and a comparable glazed unit.

The cost of sash windows might not be as competitive as you think if your quote doesn’t cover all the essential parts of your manufacture and installation.

All of the following should be included as a minimum standard:

  • 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 sills
  • 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.

Can I replace sash windows myself?

While it's technically possible to replace sash windows as a DIY project, we strongly advise against it. Sash windows have complex mechanisms that require precise fitting to ensure smooth operation and insulation.

Incorrect installation can lead to windows that don't operate smoothly, water ingress and damp problems and potential damage to the building fabric.

Additionally, all window installations must be certified under building regulations by a FENSA or Certass registered installer. Using a professional ensures your installation meets all legal requirements and is properly guaranteed.

To avoid major issues that can result in being costly to rectify, we only recommend you use a competent window company experienced with the installation of sash windows.

FAQ

Are sash windows more expensive than casement windows?

Sash windows are typically more expensive than casement windows because they are more complex to manufacture and install. Their traditional design, vertical opening mechanism and detailed proportions often require more materials and precision, particularly for period-style or made-to-measure installations. Many homeowners choose sash windows for their appearance and suitability for character properties, which is reflected in the overall cost.

Why do sash window prices vary so much?

The cost of sash windows can vary widely due to differences in size, material choice, glazing specification and installation complexity. Factors such as whether existing box sashes need to be removed, the condition of the surrounding structure and the level of bespoke manufacturing required can all influence the final price. For this reason, guide prices are best used as a starting point rather than a fixed figure.

Does the cost include installation?

Yes, Everest sash window prices include professional installation as part of the overall package. However, it’s important to note that not all sash window prices you see online include fitting, with many based on supply-only costs. Installation requirements can still vary depending on the property and existing windows, which is why a tailored quote provides the most accurate cost for your home.

Can you upgrade single glazed sash windows to double glazing?

Yes, single glazed sash windows can be upgraded to double glazing. All Everest modern sash windows are double glazed.

This can either be done by removing the complete unit and sash box to replace as a new unit. This has the advantage that a deeper double glazed unit can be installed.

Or, you can just replace the sash with new double glazed units. However, you might be restricted on the depth of the glazed unit which can compromise the energy efficiency of the window.

If you live in a listed building that can’t be upgraded to double glazed panes, we recommend secondary glazing as a highly effective energy saving solution.

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