Energy performance is one of the greatest challenges for owners of older homes. While solid brick walls and suspended floors present issues, one of the easiest wins lies in upgrading the glazing, particularly through the use of slimline double glazing.
Slimline glazing has emerged as the preferred solution for hardwood timber sash window refurbishments in period homes across South West London. Unlike standard double glazing, which often alters sightlines and frame thickness, slimline units offer improved thermal performance in a format that’s visually near-identical to single-pane glass.
The benefits extend well beyond energy. Homeowners in Wandsworth and Streatham frequently report improved comfort, reduced street noise, and fewer condensation issues after installing slimline units. Because the overall thickness is kept to around 12mm-14mm, these units can be fitted into traditional rebates and profiles, making them ideal for listed buildings or homes under Article 4 restrictions.
One homeowner in Battersea opted for slimline upgrades as part of a full façade refurbishment. The original single-glazed sashes had become draughty and brittle over time, yet the home’s front elevation was protected under local conservation rules. By switching to custom-made sashes with slimline glazing, they achieved a marked improvement in heat retention while maintaining full visual compliance.
For developers, slimline double glazing helps address EPC requirements in a format acceptable to planning officers. On multi-unit conversions, it offers a scalable solution for enhancing comfort and sustainability while meeting conservation requirements.
The technology behind slimline glazing has also evolved. Today’s units can include warm edge spacers, inert gas fillings, and even acoustic layers to improve performance further. Yet from the outside, the windows retain their delicate character and historic proportions.
For projects where thermal performance must meet modern standards without compromising traditional detailing, we manufacture bespoke sash frames designed to house slimline glass within authentic timber profiles. Our hardwood timber windows are tailored to ensure both planning compliance and occupant comfort.