Looking for sash window replacement in Westminster? S&K Glazing has been installing across Greater London for over a decade. Sliding sash windows are the architectural signature of British period properties — Georgian, Victorian, and Edwardian terraces, townhouses, and cottages.
Sliding sash windows are the architectural signature of British period properties — Georgian, Victorian, and Edwardian terraces, townhouses, and cottages. Original timber sashes often suffer from rot, draughts, rattle, and single-glazed inefficiency. S&K Glazing manufactures and installs replacement sash windows that match the original sightlines, glazing bar layouts, and sash horn profiles, but deliver modern U-values from 1.3 W/m²K and acoustic reductions up to 42dB. Available in engineered timber or slim-profile uPVC for conservation areas where uPVC has been approved.
Westminster's mix of Georgian terraces, mansion blocks, and prestigious commercial premises requires a glazier with heritage credentials and commercial experience. We've worked across SW1, W1, W2 and WC2 on listed-building secondary glazing, shopfronts on Bond Street and Marylebone High Street, and acoustic upgrades for properties facing busy West End streets.
For heritage and listed-property work in Westminster, planning constraints frequently dictate the spec — we work within Greater London council's conservation area rules and listed-building consent requirements, using putty-glazed timber sashes, slim-sightline secondary glazing systems that sit invisibly behind original primary glazing, and steel-window restoration for Crittall-style frames. Most commonly we're working across SW1, W1, W2 and WC2 postcodes. We prepare the heritage statement and Building Regulations submission alongside our quote where it's needed for London conservation areas.
We measure the original sash, photograph architectural details (horns, beading profiles, glazing bar widths) and confirm conservation status with your local authority where applicable.
Each replacement sash is manufactured to your exact original dimensions and profile. Timber units use engineered redwood or accoya with factory micro-porous paint. uPVC units use slim heritage profiles.
Installation works elevation by elevation, typically 1-2 sashes per day. We retain original architraves and reveal mouldings wherever possible.
Free survey, fixed-price quotes, no pressure sales. Call us, message on WhatsApp, or fill in the form — we typically respond within an hour during working days.
Local survey, fixed-price quote, no obligation.
