Slimline Double Glazing in Borehamwood , Hertfordshire

Navigating Article 4 directions in places like the Shaftesbury Park Estate or Clapham Manor can be tricky for homeowners. Most local authorities in South West London prefer repairs to original timber, but they often permit slimline double glazing if the joinery matches the original sightlines exactly. Because our units are significantly thinner than standard 24mm double glazing, we can use traditional putty lines and narrow glazing bars that satisfy conservation officers. We understand the specific requirements of Wandsworth, Lambeth, and Richmond councils, and we build every sash to measure in our Battersea workshop to stay compliant. If you are unsure about your local restrictions, Charlie can advise on the best approach for your specific property during a site visit.

Standard double glazing often looks bulky and out of place on a Victorian terrace or a Georgian townhouse. Slimline units solve this by using argon gas between the panes, which is a much better insulator than plain air. This allows the glass to be thinner without losing heat-stopping power. When we install these into your timber sashes, you get a significant reduction in heat loss and a noticeable drop in external noise from busy South West London roads. We also machine hidden brush seals into the new beads, which works alongside the glass to stop draughts completely. This upgrade keeps your home warmer and quieter without the need for thick, modern-looking timber sections.

In many cases, your original Victorian box frames are made of high-quality, slow-grown timber that is better than anything available today. We prefer to keep these frames in place. We carefully remove the old sashes and replace them with new, bespoke timber sashes designed to hold slimline double-glazed units. If your sills or the bottom of the box frame have rot, we use seasoned timber splices to rebuild those sections rather than ripping out the whole window. This method saves you money, preserves the original interior plasterwork, and maintains the external architectural look of your home.

Living near the South Circular, the A3, or under the Heathrow flight path in Richmond means noise is a constant factor. While single-pane glass does very little to block sound, our slimline double-glazed units provide a much-needed acoustic buffer. The two layers of glass, separated by an argon gas cavity, dampen vibrations significantly. When paired with our professional draught-proofing system—which seals the gaps where sound usually leaks through—the result is a much calmer and quieter living environment. It is an ideal solution for mansion flats and terraced houses that front onto busy transport corridors.

We stand behind the quality of our joinery and installation. Every new bespoke timber sash window we install comes with a 10-year guarantee, giving you peace of mind that your investment is protected. We are also FENSA registered, which means our installations comply with building regulations and are officially logged. This is particularly important if you ever decide to sell your home, as solicitors will require the FENSA certificate to prove the windows meet current standards. Our goal is to provide a permanent, high-quality solution that lasts for decades, not just a quick fix.