Slimline Double Hinged Secondary Glazing made to measure for Treharris, Merthyr Tydfil. A super-slim double hinged unit with single-handle operation — slim sightlines across a double opening.
Best for: wide period openings where slim sightlines matter.
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.
Prefer to see the whole range for your area? Visit secondary glazing in Treharris.
Yes — we make double hinged unit · slimline to measure for Treharris and across Merthyr Tydfil, supply-only or fitted.
It's our recommended unit for wide period openings where slim sightlines matter.
Price depends on size, glass and finish. Our online configurator gives an instant price on standard sizes, or a fast bespoke quote on larger and special units.
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