Sash Window Double Glazing Across
South London

Original single-glazed windows are a primary source of heat loss in older properties, often leading to cold spots and high energy bills. Our double glazing upgrade transforms your home's thermal envelope while simultaneously providing significant acoustic insulation. This is particularly effective for properties located on busy London transport routes, where heavy traffic noise can be a constant disturbance. By replacing single glass panes with modern units designed to mimic the original putty line, we reduce street noise and draughts significantly, ensuring your home remains a quiet, temperate sanctuary throughout the year.

We prioritise the preservation of your existing box frames whenever they are structurally sound. Our process involves removing the existing single-glazed sliding sashes and replacing them with new, made-to-measure timber sashes fitted with high-performance double-glazed units. We use low-emissivity glass and warm-edge spacers to meet current energy standards. During this installation, we also rebalance your counterweights using traditional heavy-duty wax-impregnated cotton cords and install hidden brush seals to permanently eliminate draughts. If sections of the sill or frame show signs of decay, we perform precise timber splicing using durable, seasoned hardwood or Accoya to restore the structural integrity of the window before the new sashes are hung.

We understand that living in a conservation area or a listed building in Westminster and London often comes with strict planning constraints. Our service is designed to satisfy these requirements by maintaining the exact architectural proportions of your original glazing bars and timber profiles. Because our double-glazed units are much thinner than standard double glazing, they replicate the authentic appearance of traditional window glass, ensuring you can upgrade your home's performance while remaining fully compliant with local Article 4 planning directions.

Every project is managed directly by Charlie Burgess, ensuring personal attention to detail from the initial survey to final installation. We are FENSA registered, meaning all new bespoke timber window installations comply with building regulations and come with a comprehensive 10-year guarantee for your peace of mind. We hold £2m public liability insurance and maintain a clean, respectful working environment to protect your property during the installation process. We do not use uPVC or generic materials, focusing exclusively on the craft of high-quality timber joinery. To discuss your conservation-compliant sash restoration or to book a detailed sash survey and written quotation, call 020 7046 0157.