Secondary Glazing Specialists LondonListed Building & Heritage Experts
London's leading secondary glazing specialists for listed buildings, conservation areas, and heritage homes. We provide expert acoustic and thermal glazing solutions that achieve up to 80% noise reduction while preserving your property's historic character.
Acoustic Secondary Glazing for London Traffic Noise
Our 10.8mm acoustic laminate glass reduces traffic noise by up to 54dB, transforming noisy London streets into peaceful sanctuaries. Unlike standard double glazing, secondary glazing creates a larger air gap (100mm+) that provides superior sound insulation - the physics-backed solution recommended by acoustic engineers for urban homes.
Listed Building Secondary Glazing Specialists
As specialists in heritage properties, we understand the unique requirements of working with listed buildings and conservation areas. Secondary glazing is the only approved solution for most listed properties as it preserves original windows while providing modern thermal and acoustic performance. Historic England recommends secondary glazing as a reversible improvement that respects heritage fabric.
Thermal Insulation for Period Properties
Reduce heat loss through single-glazed sash windows by up to 65% with our thermally efficient secondary glazing. Our systems help London homeowners cut heating bills while maintaining the authentic appearance of Georgian, Victorian, and Edwardian windows that define the capital's most prestigious conservation areas.
Secondary Glazing Services by Area
- Secondary Glazing Kensington - Expert installations for Royal Borough properties
- Secondary Glazing Chelsea - Heritage solutions for SW3 and SW10 conservation areas
- Secondary Glazing Westminster - Listed building specialists in SW1 and W1
- Secondary Glazing Islington - Georgian townhouse glazing experts in N1
- Secondary Glazing Camden - Victorian terrace specialists in NW1 and NW3
- Secondary Glazing Hampstead - Period property glazing for NW3 conservation area
Popular Secondary Glazing Guides
New to secondary glazing? Start with our most-read guides answering the questions London homeowners ask most:
- Do I need planning permission for secondary glazing?
- How much does secondary glazing cost? 2026 price guide
- Is secondary glazing worth it? Honest pros, cons and ROI
- Can you still open your windows with secondary glazing?
- Secondary glazing vs double glazing: which is better?
- Browse all secondary glazing guides →
How Secondary Glazing Works
Secondary glazing is a discreet second window fitted to the inside of your existing window. It does not replace your original glass — it works alongside it. The two panes trap a wide pocket of still air between them, and that air gap is what does the hard work.
That single, simple idea delivers three big benefits:
- Quieter rooms. The air gap absorbs sound energy before it reaches you, cutting traffic, aircraft, and railway noise by up to 80%.
- Warmer homes. The trapped air slows heat escaping through the glass, reducing heat loss from single-glazed windows by up to 65%.
- No draughts or condensation. Sealed brush gaskets stop cold air sneaking in and keep the inner pane warm, so misting and damp are far less likely.
Crucially, the whole system is internal and fully reversible. Nothing about the outside of your building changes, which is exactly why it is the go-to upgrade for listed homes and conservation areas.
Why London Homeowners Choose Us
Secondary glazing is a long-term investment in your home, so the quality of the design and fit matters as much as the glass itself. Here is what sets our service apart:
- Heritage expertise. We specialise in Georgian, Victorian, and Edwardian properties and handle listed building consent and conservation paperwork on your behalf.
- Made to measure. Every panel is fabricated to fit your exact opening — including bays, arches, and oversized sashes — so the result is near-invisible.
- Honest, itemised quotes. Your free survey ends with a clear, no-obligation breakdown, so you know exactly what you are paying for.
- Proven track record. Over 2,500 installations completed across London's most prestigious addresses, from Kensington mansion flats to Islington townhouses.
Free Heritage Window Survey
Book your complimentary survey with our heritage glazing consultants. We assess your property, measure your windows, discuss glass specifications, and provide a detailed quote - all with no obligation. Our specialists have completed over 2,500 installations across London's most prestigious addresses. Contact Secondary Glazing Specialist today on 020 7060 1572 for your free consultation.
Secondary Glazing Specialists
for London Listed Buildings
Bespoke secondary glazing crafted for Britain's finest period properties. Preserving architectural integrity while delivering silence and thermal comfort.
54dB
Sound Reduction
65%
Heat Retention
2,400+
Listed Homes
Up to 80% Noise Reduction
Move the slider to simulate the acoustic transformation our secondary glazing delivers. From city noise to library silence.
Outside
78dB
Inside
51dB
Our acoustic secondary glazing
Listed Building Glazing Experts
Every heritage classification demands a unique approach. Our team holds specialist accreditations for all levels of listed building and conservation area compliance.
Grade I Listed
Buildings of exceptional interest. Our bespoke systems are approved for the most sensitive heritage structures in England and Wales.
340+
Grade I projects
Grade II Listed
Nationally important buildings of special interest. We work with conservation officers to ensure full compliance.
1,800+
Grade II projects
Conservation Areas
Areas of special architectural or historic interest. Our discrete installations preserve the character of entire streetscapes.
420+
Conservation areas served
Acoustic Glass Specifications
10.8mm Acoustic Laminate
Two layers of 4mm float glass bonded with a 2.8mm acoustic PVB interlayer, delivering class-leading sound insulation.
Rw 45dB
Weighted Sound Reduction
Thermal Retention
Reduces heat loss by up to 65%, dramatically lowering heating costs while eliminating cold draughts.
0.65
U-Value (W/m²K)
Acoustic Performance
Up to 54dB noise reduction, transforming busy urban environments into serene sanctuaries.
54dB
Maximum Reduction
Sight Lines
Ultra-slim 22mm aluminium frames, powder-coated to complement period joinery. Virtually invisible from the street.
22mm
Frame Profile
Security Enhancement
Additional glazing layer provides an extra barrier against forced entry, without altering the external appearance.
PAS 24
Security Standard
Bespoke Manufacture
Every panel is measured to 0.5mm tolerance and manufactured to order. No off-the-shelf solutions.
0.5mm
Manufacturing Tolerance
Free Secondary Glazing Survey
Every heritage property is unique. Our concierge survey process begins with understanding your home, your needs, and your aesthetic preferences.
Step 1
Your Property
Step 2
Requirements
Step 3
Consultation
Step 1 of 3
Tell Us About Your Property
What Our Clients Say
Rated 4.9 out of 5 across 127 reviews from London homeowners.
"Exceptional service from start to finish. The noise reduction in our Kensington townhouse is remarkable — we no longer hear the constant traffic on the high street, even in the front bedrooms."
"Specialists who truly understand listed buildings. They handled our Grade II* property with real expertise and managed the conservation paperwork so we didn't have to worry about a thing."
"Our Georgian sash windows were draughty and freezing every winter. The secondary glazing has transformed the house — warmer rooms, lower heating bills, and the original windows look untouched."
"From survey to installation the team was professional and tidy. The fit is so discreet that visitors don't even notice the secondary glazing is there. Sleep has never been better."
"We live near a busy junction and the difference is night and day. The acoustic glass they recommended cut the noise dramatically. Worth every penny for the peace and quiet."
"Honest advice, fair pricing, and beautiful craftsmanship. They talked us through every option without any pressure. I would recommend them to anyone with a period property."
Secondary Glazing: Your Questions Answered
Everything London homeowners ask about noise reduction, listed buildings, cost, and installation.