Replacement Sash Windows

In most cases, we can restore and renovate timber sash windows, even replacing parts of the timber and rescuing sashes that have been painted shut. But there are occasionally times when conserving the original windows is not possible or is no longer a cost-effective option.

We offer a comprehensive design, manufacture and fitting service for any type of wooden sash window, from sliding box sash windows to bespoke designs, with or without Georgian bars and other decoration, painted or unpainted.

Timber sash window features

  • Replica sash windows & new designs
  • Georgian glazing bars
  • Authentic period sash window furniture
  • Traditional lead weights & pulleys
  • Any design, configuration and thickness
  • Fully draught-proofed
  • Wooden sills, architraves & other period joinery features
  • Single glazing & slim double glazing available for period properties
  • Other timber window styles available

Sash window installation

One of our experienced sash window joiners will visit your property to discuss your new windows and measure every aspect of the window including top and bottom rails, frame depth, sill, astragal bars and sashes.

With expert advice and a free site survey, deciding whether to renovate or upgrade your sash windows couldn’t be simpler. Check out our sash window restoration services for replacement glazing, sills, frames and other repairs, or get in touch for a free survey.

Energy efficiency

Energy efficient timber sash windows

Wood is an excellent thermal insulator, and our timber frames have great energy efficient properties. However, as experts in the heritage and conservation markets, we understand that most traditional timber windows that use single glazing can still lose a considerable amount of heat during their lifetime. That’s why we also offer slim double glazed timber sash windows, as well as secondary glazing and shutters to improve a single glazed property’s energy efficiency.


Sash window glazing

Whether you’re looking for single glazed sash windows for a conservation area or double glazed sash windows to maintain a traditional look, we have a range of glazing options available.

We work closely with conservation officers to offer the best specification sash windows possible in your area. Many properties can benefit from a double glazing upgrade, with a range of gases and seals available for enhanced energy efficiency. We also offer Slimlite double glazing to give you the performance benefits of modern double glazing with the aesthetic appeal of traditional single glazing.

We can even use drawn glass types for an authentic traditional look.

Types of timber

Wooden sash windows

We typically a variety of softwood and hardwood timber species in the manufacture of our timber sash windows, such as oak, sapele, Douglas fir, tulip wood, larch and Baltic redwood. Let us know if you have a specific wood type in mind – we can source most varieties!

At Wessex Restoration, we always choose air-dried rather than kiln-dried timber, sourced as locally and sustainably as possible.

Painting & finishes

Pre-painted sash windows

Our sash windows are supplied with a prime finish as standard, treated using traditional anti-rot treatment and ready to be painted or varnished. We can also install pre-painted sash windows in any colour (including white!) and offer on-site painting services from a sash window specialist.

Our Restoration Projects

We have carried out renovation projects on numerous properties in conservation areas and listed buildings. Read about some of our heritage restoration projects, including bespoke designs and replica period features!

Kresen Kernow Archive Centre
timber sash window renovation
Case study: Timber sash window renovation and repair
Tyndalls Park Road
Refurbishing Grade II listed building at the University of Bristol