Sheerline has launched the S3 architectural roof system, its new single pitch roof and a smarter take on the traditional lean-to, which will be initially available direct from Sheerline Bespoke, Sheerline’s new product focussed division.

Unveiled at the 2025 FIT Show, Sheerline says the S3 brings together contemporary styling, market-leading thermal performance, and rapid on-site assembly, making it the most advanced roof system of its kind.

Fully thermally broken using Sheerline’s Thermlock technology, the S3 also features sleek 135mm deep and 50mm wide aluminium rafter bars and shallow rafter caps to create a clean, minimalist aesthetic.

Delivered in pre-configured kits with fewer components, the S3 is designed to significantly reduce installation time compared to a traditional lean-to system. It also includes features such as a factory-set pitch and a triple-lock wall plate for superior sealing and thermal efficiency.

The S3 also works seamlessly with Sheerline’s aluminium range of windows and doors to offer perfectly matched aluminium glazed extensions.

Sheerline Bespoke’s commercial director, Chris Cooke, said: “The S3 is of the moment and exactly what the market needs right now; it’s cleaner, more squared-off, and perfect for contemporary aluminium glazed extensions.

“The system works flawlessly with Sheerline’s aluminium windows and doors, and its versatility means it’s perfect for everything from glazed extensions to outdoor living structures.”

Chris Baron, operations director, added: “There’s nothing else like the S3 on the market. The thermal performance is incredible, around 230% better insulated than a traditional conservatory roof thanks to Thermlock. Combine that with its modern looks and ease of installation, and we genuinely believe this system is going to change the game.”

Installers can also offer customers better ventilation with optional SheerVent roof vents, while an integrated premium guttering system with concealed fixings and insulated eaves beam delivers a polished finish from top to bottom.

The S3 is available to pre-order now from Sheerline Bespoke.