Balanced Vertical Slider Secondary Glazing made to measure for Harlech, Gwynedd. Vertical sliding units designed to accompany sash windows. Self-supporting panes stay in place at any chosen position.
Best for: traditional and listed sash windows.
In Harlech, the mix of period and modern housing means owners often want insulation without altering the original frames. 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 Harlech.
Yes — we make balanced vertical slider to measure for Harlech and across Gwynedd, supply-only or fitted.
It's our recommended unit for traditional and listed sash windows.
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