Secondary Glazing LondonAcoustic & Thermal Windows for Listed and Period Homes

Secondary Glazing Windows Across London

London's period housing stock — much of it listed or within conservation areas — presents a unique challenge: how to escape the roar of city traffic, railways and flight paths while keeping the character of original single-glazed windows. Replacement double glazing is rarely permitted and often destroys historic fabric. Secondary glazing is the answer, and it is what we do exclusively.

Our bespoke internal units sit discreetly behind your existing windows, delivering modern acoustic and thermal performance while remaining fully reversible. Explore our complete secondary glazing guide or jump straight to the solution you need below.

London Noise: The Capital's Biggest Glazing Challenge

No other UK city puts windows under the strain that London does. Red-route arterial roads such as the A40, A4 and Euston Road carry traffic around the clock; the Underground and overground rail network sends low-frequency rumble through entire terraces; and homes beneath the Heathrow and City Airport flight paths contend with aircraft noise that peaks well above comfortable levels. Single-glazed sash windows — the standard across the capital's Georgian and Victorian housing — offer almost no defence, typically blocking little more than 25dB.

This is where secondary glazing outperforms even modern replacement double glazing. By fitting a fully independent internal window with a wide 100–150mm air gap and 10.8mm acoustic laminate glass, we decouple the two panes so sound waves cannot pass straight through. The result is up to 54dB of noise reduction — enough to turn a room facing a busy London junction into a genuinely quiet space. For homes near stations or flight paths, our acoustic noise reduction glazing is the single most effective upgrade available.

Conservation Areas & Listed Buildings Across London

More than a thousand conservation areas cover London, and tens of thousands of properties carry Grade I, Grade II* or Grade II listings. From the stucco terraces of Kensington and Chelsea to the Georgian squares of Islington and the maritime townscape of Greenwich, planning rules protect the original windows that define these streets. Replacing them with uPVC or aluminium double glazing is almost always refused — and can trigger enforcement action.

Because secondary glazing is installed entirely inside the room and can be removed without leaving a trace, it is classed as a reversible alteration and rarely requires listed building consent. We liaise directly with borough conservation officers, match frame finishes to your existing joinery, and align our slim meeting rails with your original sashes so the system all but disappears. It is the compliant route to a warmer, quieter home — explained fully in our guide to secondary glazing for listed buildings.

Secondary Glazing Services in London

Secondary Glazing by London Borough

We have local teams and completed projects across London. Find dedicated information for your area:

• Secondary Glazing Kensington
• Secondary Glazing Chelsea
• Secondary Glazing Westminster
• Secondary Glazing Islington
• Secondary Glazing Camden
• Secondary Glazing Hampstead
• Secondary Glazing Richmond
• Secondary Glazing Greenwich
• Secondary Glazing Wandsworth
• Secondary Glazing Hammersmith & Fulham
• Secondary Glazing Dulwich

Browse all London boroughs we serve →

Why London Homeowners Choose Us

As London's specialist secondary glazing company, we combine heritage sensitivity with modern engineering. Our 10.8mm acoustic laminate glass achieves up to 54dB noise reduction, our thermally broken systems cut heat loss by up to 65%, and we work directly with borough conservation officers to guarantee compliance. Call 020 7060 1572 for a free London heritage window survey.