Secondary Glazing London

We are London's dedicated acoustic secondary glazing specialists, focused exclusively on protecting heritage homes from the city's relentless noise. Unlike general glaziers who treat secondary glazing for sash windows as a sideline, our entire craft is built around one mission: delivering measurable, survey-led acoustic specifications for period properties, listed buildings, and conservation area homes across the capital. Homeowners comparing options can start with our residential secondary glazing for London sash windows or request a measured specification through our free London secondary glazing survey.

Heritage windows are irreplaceable. Original Georgian, Victorian, and Edwardian sash windows define the character of London streetscapes — and replacing them is rarely permitted, often undesirable, and never reversible. Our acoustic secondary glazing sits discreetly behind the existing window, preserving every original feature while transforming the acoustic performance of the room. It follows the reversible conservation approach described by Historic England's secondary glazing guidance and is routinely approved by local conservation officers for soundproof windows in listed buildings and conservation areas.

At the core of every installation is our 10.8mm acoustic laminate glass, engineered with an acoustic-grade PVB interlayer that dampens sound waves across the full frequency spectrum — from low-frequency bus rumble to high-frequency sirens and aircraft. Paired with our precision 100–150mm air gap, this configuration can deliver up to 54dB of noise reduction in suitable configurations. Actual performance depends on the existing window, glass, air gap, seals, room construction and noise frequency. The wide cavity can provide stronger acoustic separation than the narrow cavity in many replacement double-glazed units. This is the gap that matters most: the wider the cavity, the better the acoustic decoupling, and we tune it to each window for peak performance. The technical detail is explained in our 10.8mm acoustic laminate glass specifications for secondary glazing and our secondary glazing noise reduction science guide.

Every installation is backed by a warranty of 10 years as standard, 25 years on premium and heritage packages covering materials, frames, and workmanship — a confidence underwritten by a planning-aware heritage design approach across every listed building application we have submitted. When clients compare secondary glazing vs double glazing for noise, the verdict is consistent: properly specified acoustic secondary glazing is quieter, cheaper, and heritage-safe. For budgeting, see our secondary glazing noise reduction cost guide for London homes before booking a survey.

We serve London's most acoustically demanding postcodes, with deep experience in Kensington, Chelsea, and Westminster — boroughs where stucco terraces, mansion blocks, and Grade II listed townhouses sit beside the city's busiest arteries. Whether you need soundproofing sash windows in London on a Royal Borough mansion, an Eaton Square portico, or a Westminster Listed Building Consent project, our acoustic glazing specialists survey, design, and install in-house with no subcontractors and no compromises. Explore local guidance for secondary glazing in Kensington conservation areas, acoustic secondary glazing for Chelsea sash windows, and listed building secondary glazing in Westminster.