Heritage sash windows preserve the proportions and detailing that define the restored Victorian facade.


Traditional sash windows sit naturally within the redesigned interiors, connecting the property’s original character with its contemporary spaces.
Featured Ranges in Our Kensington Installation
Bereco Heritage timber sash windows were specified to reproduce the proportions and detailing of the original windows. For Pembroke Gardens, the range was configured with traditional weights and pulleys, slim 16mm Lambs Tongue glazing bars, and narrow-cavity SlimLine glazing, with curved glazing used where required for the upper-floor stone arches.

Heritage Sash Windows for a Victorian Terrace in Kensington
This property was carefully restored within the Edwardes Square conservation area, where retaining the character and original design features of the property was a key consideration. Although refurbishment of the existing sash windows was initially planned, the project moved towards sympathetic replacement, with new heritage timber sash windows specified to closely recreate the appearance and distinctive detailing of the originals.
Project Details & Challenges
From Refurbishment to Sympathetic Replacement
CC Construction initially planned to refurbish the existing windows and doors in line with the council’s conservation guidelines. After visiting the Sash Windows London showroom in Clapham, however, the client became confident that replacement sash windows could remain sympathetic to the property’s original appearance.
With council approval, we worked with CC Construction to specify heritage timber replacements that respected the established window design while introducing SlimLine glazing.
Recreating the Original Sash Windows
Bereco Heritage sash windows were chosen to closely replicate the original window design, with traditional weights and pulleys retaining the familiar operating mechanism. Slim 16mm Lambs Tongue glazing bars recreated the distinctive Victorian glazing pattern, while the proportions and detailing were carefully considered to remain in keeping with the existing terrace and meet the conservation requirements for the property.
Curved Glazing for the Upper-Floor Arches
The upper-floor windows required a more individual approach. Curved glazing was specified to follow the retained stone arches, allowing the replacement sash windows to respond closely to the existing architecture rather than relying on a standard window design.
SlimLine Glazing Within a Heritage Specification
The Bereco Heritage range offered both single and SlimLine glazing. With borough approval, the clients selected narrow-cavity SlimLine glazing, providing improved thermal efficiency while retaining the slender proportions required for the property’s heritage window design.

Timber Sash Windows for Kensington Homes
Planning to replace or restore timber sash windows in Kensington or elsewhere in West London? We can discuss your property, consider any relevant conservation requirements, recommend an appropriate heritage specification, and arrange a survey to assess the project in detail.
Project Related FAQs
Can sash windows be replaced in a Kensington conservation area?
Replacement may be possible, but the design needs to respond carefully to the property and relevant conservation requirements.
Can double glazing be used in heritage sash windows?
Heritage sash windows can be available with glazing options intended to retain slender traditional proportions. For the Pembroke Gardens project, narrow-cavity SlimLine glazing was approved in place of single glazing, providing improved thermal efficiency while remaining appropriate for the heritage specification.
What are Lambs Tongue glazing bars?
Lambs Tongue describes a traditional moulded profile used for glazing bars in timber windows.
Can heritage sash windows be made for curved openings?
Project-specific joinery and glazing can respond to unusual architectural details. At Pembroke Gardens, curved glazing was used for the upper-floor sash windows to follow the retained stone arches, allowing the replacements to fit the existing architecture more closely.
How do traditional weights-and-pulleys sash windows work?
Weights and pulleys form the traditional balancing mechanism used in sash windows. The Heritage sash windows at Pembroke Gardens incorporated this system in replica of the original windows, retaining a traditional method of operation as part of the wider conservation-led specification.