If you're in Treharris, our made-to-measure secondary glazing cuts noise and heat loss without replacing your windows.
In Treharris, plenty of homes locally keep their original windows, where an internal second pane is the only practical upgrade. 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 Treharris and the wider Merthyr Tydfil 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