Secondary Glazing

Secondary glazing in London is the smart solution for homeowners who want better insulation and quieter rooms without replacing their existing windows. By fitting a slim, independent glazed panel to the inside of your current window, secondary glazing creates an insulating air gap that cuts heat loss and reduces noise — all while preserving the original frames. This makes it ideal for listed buildings, conservation areas and period homes across the capital where window replacement is restricted or undesirable. At Lord Glazing, with 15+ years' experience and 5,000+ projects completed, we install discreet, high-performance secondary glazing tailored to each property.

Why choose secondary glazing in London

Many of London's most characterful homes sit in conservation areas or carry listed status, meaning the original windows must be retained. Secondary glazing respects that heritage while delivering modern comfort: warmer rooms, lower energy bills and a dramatic reduction in traffic, rail and aircraft noise. Because it sits behind the existing window, it is barely visible from outside and fully reversible. As a FENSA registered, GGF member company that is TrustMark approved and Checkatrade verified, we install secondary glazing sensitively and to a high standard, earning a 4.9★ rating from over 200 reviews.

Key benefits

• Outstanding noise reduction — the wider air gap makes secondary glazing exceptionally effective against urban noise.
• Improved insulation — warmer rooms and reduced draughts without altering the original window.
• Heritage-friendly — ideal for listed and conservation-area homes where replacement is not permitted.
• Cost-effective — a more affordable route to comfort than full replacement.
• Reduced condensation — the added barrier helps keep original windows drier.
• Reversible & discreet — slim sightlines and easy removal if ever needed.

Options & materials

We offer a range of secondary glazing systems to suit your windows and needs:

• Horizontal sliding units — easy operation for casement and standard windows.
• Vertical sliding units — designed to complement traditional sash windows.
• Lift-out and hinged panels — practical for smaller or awkward openings.
• Acoustic glass — for maximum noise reduction near busy roads and railways.
• Discreet slimline frames — in white or colour finishes to blend with your interior.

If your windows are beyond saving, you may prefer our sash windows restoration or full double glazing instead.

Our secondary glazing installation process

1. Free survey — we measure your existing windows and recommend the best system.
2. Transparent quote — a clear fixed price with no obligation.
3. Bespoke manufacture — panels made to fit your openings precisely.
4. Clean installation — our fully insured fitters install discreetly with minimal disruption.
5. Handover & guarantee — we demonstrate operation and provide your 10-year guarantee.

Secondary glazing across London

We install secondary glazing across all 33 London boroughs, including Central London (Westminster, Kensington & Chelsea, the City of London), North London (Camden, Islington, Haringey, Barnet, Enfield), South London (Lambeth, Southwark, Wandsworth, Lewisham, Croydon, Bromley, Merton, Sutton, Kingston, Richmond), East London (Tower Hamlets, Hackney, Newham, Waltham Forest, Redbridge, Barking & Dagenham, Havering, Greenwich, Bexley) and West London (Ealing, Hounslow, Hillingdon, Brent, Harrow, Hammersmith & Fulham). With so many period and listed homes in the capital, our heritage-friendly service is in demand across every region.

Secondary glazing for listed and conservation-area homes

A large share of London's housing sits within conservation areas, and the capital has many thousands of listed buildings where the original windows are legally protected. For these homes, secondary glazing is often the only practical way to improve comfort, because it leaves the historic window completely untouched and is entirely reversible. We work sympathetically with period properties — selecting slim, unobtrusive frames and finishes that respect the character of the room while delivering modern warmth and quiet. Where local rules are strict, our experience as a GGF member and FENSA registered company helps us recommend solutions that satisfy planning expectations and conservation officers. If you are unsure what is permitted for your property, we are always happy to talk it through during a free no-obligation survey.

Why London homeowners choose Lord Glazing

With 15+ years' experience and over 5,000 completed projects, Lord Glazing combines heritage sensitivity with modern performance. We are fully insured, TrustMark approved and Checkatrade verified, and we provide transparent fixed pricing with a 10-year guarantee on every installation. Our 4.9★ rating from over 200 reviews reflects a consistent standard of tidy, considerate workmanship — particularly important when working inside cherished older homes. Whether you need a single noisy bedroom treated or secondary glazing throughout a Georgian townhouse, we deliver discreet, effective results.

Pricing guide

Secondary glazing with Lord Glazing starts from £150 per window, making it one of the most affordable ways to improve comfort and cut noise. The exact price depends on window size, system type and glass specification, and we always provide a transparent fixed quote. Get a free quote or call 020 3633 8141 to discuss your home. You can also contact us at info@lordglazing.co.uk.

Frequently Asked Questions

Does secondary glazing really reduce noise?

Yes — it is one of the most effective noise solutions available. The larger air gap between the original window and the secondary panel absorbs sound, and acoustic glass options improve it further for homes near busy roads or railways.

Is secondary glazing suitable for listed buildings?

It is ideal. Because it sits inside the existing window and is fully reversible, secondary glazing is usually acceptable for listed and conservation-area properties where replacement windows are not permitted.

Will it look bulky from inside?

No. Our slimline frames are designed to be discreet, and from the street the secondary glazing is virtually invisible behind your original windows.

Can I still open my windows?

Yes. We supply sliding, hinged and lift-out systems so you can open the original window for cleaning and ventilation whenever you need to.

Is it cheaper than replacing my windows?

Generally yes. Starting from £150 per window, secondary glazing is a cost-effective way to gain warmth and quiet without the expense or planning issues of full replacement.