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Casement windows in bay

Timber casement windows

Beautiful new hardwood timber casement windows for your home. From SashWise, the window installation and restoration experts. 

Casement windows in bay

Is this for you?

  • Have your original timber casement windows been replaced by UPVC or aluminium windows?
  • Are your original timber casement windows, draughty, poorly fitting, hard to open or suffer with excessive condensation?
  • Do you want to save on your heating bills by reducing the heat loss through your windows
  • Do you want to reinstate traditional looking timber double glazed casement windows?
Casement windows in bay


  • We can manufacture new timber double glazed casement windows to suit a range of period properties, including Edwardian, Victorian and Georgian homes.
  • Our new casement windows are fitted with ironmongery that not only complements the look of the windows but provides a high level of security for your home.
  • We have extensive experience working with period, conservation, townscape merit and listed properties.
  • We manufacture a full range of timber casement windows. Flush Fit Casement Windows, where the casement sashes fit within the window frame most commonly found in period properties. Lipped Casement Windows, often referred to as ‘Storm-Proof’, with the casement sash fitting proud of the window frame, a more modern style of window.
  • Our new timber casement windows are fully finished throughout using a highly durable spray paint system.
  • Our timber casement windows can be supplied with both top and side opening sashes.
  • We can replicate all internal and external architectural timber detailing.
  • We can replicate, textured, stained and leaded glass.
  • If your current casement window frames are in good condition and not out of shape, then we can restore the frames and just replace the casement sashes (the glazed sections of the window).
Casement windows in bay

How do we do it?

We carefully remove the original casement windows which we dispose of in full.

We then fit the new timber casement window frames complete with timber double glazed casement sashes which have been manufactured in our dedicated workshop.

The new casement windows incorporated an integral draught-proofing system.

The new casement window frames are sealed to the exterior brickwork and new internal architrave and window boards are fitted.

Should any of the surrounding plasterwork have been disturbed during the installation then we will patch this up.

Finally, a full set of window furniture and locks are fitted.

Once the work has been completed the installation will be registered with FENSA and you will receive a certificate confirming that your new window is compliant with current Building Regulations.

Casement window case studies

Find out about this new sash and double-glazed casement window project in Twickenham by SashWise, the local sash window experts.

See photos of this double-glazed casement window project in Strawberry Hill by SashWise.

See photos of this new sash and double-glazed casement window project in Isleworth by SashWise.

We installed new Accoya double glazed sashes into five windows into this lovely Teddington property. Increasing thermal performance and insulation. Plus - no more rattles!

Our other services

Sash window draught proofing

Servicing and draught-proofing

If your sash windows have broken cords or are stiff or jammed shut then this service will restore them to their original smooth working order.

Georgian sash window

Sash window repair and restoration

We completely and sympathetically restore your windows, so they will look like new without losing any of their original features.

Hardwood double glazed sash windows

New hardwood double glazing

If you do not require complete window replacement we can make new double glazed timber sashes to fit your original box sash frames.

Victorian sash window

New hardwood sash boxes

We can supply and fit new hardwood sash boxes complete with double glazed sashes that exactly replicate your original windows.