Secondary glazing supplied across Cefn Sidan and the surrounding Carmarthenshire area, with optional installation.
In Cefn Sidan, many older homes here have single-glazed timber or steel windows that are expensive to heat. Secondary glazing adds a discreet, fully reversible second pane inside the existing frame — cutting heat loss by up to 60% and noise by up to 80%, with no building-regulations approval needed.
Yes — we supply made-to-measure secondary glazing to Cefn Sidan and the wider Carmarthenshire area, with nationwide delivery and optional installation by our fitters.
Prices start from around £209 per window for a fixed insert, with most made-to-measure opening units between £600 and £1,300 depending on size, glass and finish. Use our online configurator for an instant price.
Yes. Secondary glazing is internal and fully reversible, so it needs no building-regulations approval and doesn't affect listed or conservation-area status.
Configure your exact windows online in about 60 seconds — instant price on standard sizes, fast bespoke quote on the rest. Supply-only or fully fitted.
Start my instant quote →Or call 0800 088 6341 · email sales@secondarywindowsglazing.com