Historic grade II listed property in Isleworth, London

A Grade II Listed building in West London became one of a growing number of double glazed listed buildings in London and the Home Counties when we carefully restored and replaced the windows and doors on the historic property.

The White House, which over-looks the River Thames at Isleworth, was remodelled in 1832 for Sir William Cooper, Chaplain to George III.

Our client, a developer of high end residential apartments and homes, wanted to improve the noise insulation of the windows, being under Heathrow Airport’s flight path, while maintaining the original architectural integrity of the property.

Because some of the timber windows and doors needed to be replaced, while others could be saved and restored, the project required a complex combination of our specialist services, including refurbishment, part-replacement and full replacement of the sash windows and bow-fronted french doors.

By using a range of specialist single and double glazing types, we worked with our client and planning officials in Hounslow to ensure the replaced and refurbished windows and doors met all thermal and acoustic requirements, without changing the unique design and character of the property.

The restoration work on the windows that could be saved included draught proofing, de-glazing and re-glazing with single glazed, restoration laminated glass. Restoration glass has the authentic uneven surface of the original heritage (crown) glass, and laminated glass not only gives extra security, it also has improved heat and sound insulation.

For the windows that couldn’t be saved, if the original frame was in good enough condition, we replaced the moving sashes only. These replacement windows were hand-puttied and hand painted, and featured exact-match mouldings, slender true glazing bars and our slimline double glazing Timbalite, that looks just like single glazing, to improve thermal and acoustic performance while retaining the historic look of the property down to the finest detail. 

As specialists in timber windows and doors for period, conservation and listed properties, at Timbawood we have successfully fitted single glazing and slimline double glazing on listed buildings and conservation properties in over 30 planning authorities throughout London and the South East, including Westminster, Kensington and Chelsea, Islington and Greenwich*. 


Double glazed sash windows London

Are you looking for double glazed sash windows? At Timbawood we specialise in the finest single and double glazed sash windows for listed, conservation and period properties.

Not many sash window companies in London offer sash window repair as well as replacement. Many of the projects that we work on, such as the one above in Isleworth, involve a complex mixture of replacement, part replacement and sash window repair. This is particularly important for preserving as much of the architecture of listed buildings or buildings in conservation areas as possible – as well as being more cost effective than replacing each window in it’s entirety. 

One of the most popular methods of retaining the original architecture while upgrading the performance of period sash windows is to part replace the windows – which means replacing the moving sashes only, and keeping the original window frames. This includes replacing single glazed sashes with slimline double glazed sashes – to give all the benefits of double glazing, without altering the slender, elegant lines of the window.

Whether single or double glazed, our sash windows are available with a bespoke range of elegant mouldings, profiles and slim glazing bars, combining understated design with modern technology – such as the latest in high performance timber and paint systems, and a wide range of specialist glazing options.

As experts in period, conservation and listed properties we also make the finest timber casement windows, French doors, Front doors, bifold doors and internal doors. 

To find out more about any of our products or to speak to one our specialists about the options available, please get in touch.

*Please contact your local planning officer before carrying out any works on listed or conservation properties. Each property is judged on a case by case basis depending on the condition and type of the windows/doors, and the nature of the proposed works.