Looking for secondary glazing in Londonderry? S&K Glazing has been installing across County Londonderry for over a decade. Secondary glazing is the ideal solution where you can't replace the primary window — listed buildings, conservation areas, rental properties, and period homes with original sash windows.
Secondary glazing is the ideal solution where you can't replace the primary window — listed buildings, conservation areas, rental properties, and period homes with original sash windows. We install slim, virtually invisible aluminium-framed secondary units behind your existing windows, delivering noise reduction up to 50 dB and a 60% improvement in thermal efficiency, without altering the building's appearance.
Londonderry's 17th-century walled city, Georgian Bishop Street, and Victorian Waterside generate heritage-led glazing demand across BT47-BT48. Listed-building consents and timber sash restoration form the bulk of our work in this Northern Ireland walled city.
For acoustic glazing in Londonderry, aircraft noise from City of Derry Airport (LDY) shapes the brief — overhead noise here varies through the flight day. Our acoustic specifications start at Rw 38 dB reduction for standard double-glazed acoustic units and scale to Rw 52 dB for triple-glazed asymmetric builds with laminated PVB interlayers. Most commonly we're working across BT47 and BT48 postcodes. We can normally survey within a week and return a proposal showing measured baseline noise alongside the projected indoor level after install.
We measure existing reveal depths and assess the primary window's condition. Our surveys are accepted by listed-building officers and planning departments.
Each unit is made to fit your exact reveal — slim aluminium frames in white, brown, black or RAL-matched colours. Glass options include acoustic laminated and Low-E thermal.
Installed entirely from inside the property with no disruption to the original window. Most installations are completed in a single day.
Free survey, fixed-price quotes, no pressure sales. Call us, message on WhatsApp, or fill in the form — we typically respond within an hour during working days.
Local survey, fixed-price quote, no obligation.
