2-Panel Heavy-Duty Horizontal Slider made to measure for Harlech, Gwynedd. Heavy-duty two-panel slider with reinforced frame and runners for larger spans and frequent use.
Best for: large or frequently-used 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 horizontal slider hd · 2 panels to measure for Harlech and across Gwynedd, supply-only or fitted.
It's our recommended unit for large or frequently-used 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