Expert secondary glazing for London's finest period properties and listed buildings.
Professional soundproof secondary glazing for listed buildings, Victorian properties, and period homes across Richmond, Hampstead, Chelsea, and all London boroughs
With over 1,000 successful installations across London, we've helped homeowners just like you transform their properties. Don't just take our word for it -- here's what our customers experience after installation:
Real feedback from satisfied customers across London experiencing soundproof secondary glazing and same-day installation. Every project backed by our satisfaction guarantee.
•"Will it look ugly or ruin my period features?"
Our slim-profile frames are discreet and complement original windows. Our secondary glazing for listed buildings is approved by many conservation officers because it preserves heritage features.
•"Isn't it expensive?"
Secondary glazing costs 50-70% less than replacement windows, with typical payback in 3-4 years through energy savings.
•"Will installation be messy and disruptive?"
Most homes are completed in a single day with minimal mess. We use dust sheets, clean thoroughly, and respect your home.
•"Can I still open my windows?"
Yes—we design opening systems so you can access your original windows for cleaning and ventilation.
Victoria & James, Camden
Victorian Terrace
Problem:
Living on busy Camden High Street with constant traffic noise affecting sleep. Original Victorian sash windows causing high energy bills and needed Victorian window secondary glazing solution.
"The noise reduction is remarkable—we can finally enjoy peaceful evenings despite the busy road. The installation team completed everything in one day, and our heating bills have dropped by £60 a month. Best investment we've made."
Noise reduction: 20 decibels (75% quieter)
Energy savings: £720 annually
Installation: Single day completion
Windows treated: 8 sash windows
Sarah, Kensington
Listed Georgian Property
Problem:
Grade II listed townhouse with original single-glazed windows. Planning restrictions prevented window replacement while heating costs soared.
"Secondary glazing was the perfect solution—no planning permission needed, and we kept all our period features. The acoustic improvement is incredible, and our heating bills have dropped dramatically. The fitters completely understood our heritage requirements."
Planning status: No permission required
Thermal improvement: U-value 5.2 to 2.1 W/m²K
Original features: All preserved
Payback period: 3.5 years
Michael & Emma, Islington
Ground Floor Flat
Problem:
Severe condensation issues, cold bedrooms, and construction noise next door. Landlord wouldn't approve permanent window replacement.
"Our landlord approved it because it's fully reversible. The condensation has completely disappeared, and we can't hear the building work anymore. Installation took just one afternoon. Worth every penny."
Condensation: 100% eliminated
Noise reduction: 25 decibels
Renter-friendly: Fully reversible
Installation: 4 hours for 6 windows
| Metric | Average Result |
|---|---|
| 🔇Noise Reduction | 18 dB reduction (70% quieter) |
| 💰Energy Savings | 28% lower heating costs |
| ⚡Installation Speed | 85% completed same day |
| ⭐Satisfaction Rating | 4.9/5 stars (500+ reviews) |
| 📊Payback Period | 3-4 years through savings |
Every installation backed by our 10-year guarantee.
From Our Portfolio
A Grade II listed Victorian townhouse on a busy arterial road. The homeowner was losing sleep to constant traffic noise. We installed 10.8mm acoustic laminated secondary glazing across 12 original sash windows without altering the exterior appearance, achieving full conservation officer approval.
A period flat overlooking the Embankment with severe road and river traffic noise. We fitted slim-profile acoustic secondary glazing to twin casement windows, restoring a peaceful bedroom environment while maintaining the character of the original 1890s timber frames.
Ready to experience these benefits yourself? Here's how simple we make the process:
From first contact to completion in as little as 2 weeks. Most installations are completed in a single day with our same day secondary glazing installation service.
Our expert installer visits your property for a thorough assessment and provides a detailed, no-obligation quote.
What happens during the survey:
✅ You receive:
No high-pressure sales tactics. We aim to provide clarity and confidence.
Book Your Free SurveyUpon your approval, your secondary glazing units are precisely manufactured to your exact window specifications.
✅ What we confirm:
Our skilled and insured installation team transforms your windows, ensuring minimal disruption.
Morning:
Afternoon:
✅ Key benefits:
Most installations are completed within a single day. Larger projects may take two days.
We ensure you're satisfied and provide support for years to come.
Before we leave:
Post-installation:
Total timeline: Approx. 3-4 weeks from survey to installation
Heritage glazing specialists with solutions tailored to your specific property type, from Hampstead townhouses to Kensington apartments
Expert solutions for Victorian and Georgian sash windows
Bespoke panels for complex bay window configurations
Hinged panel solutions for modern casement windows
Luxury Portfolio
A selection of our recent installations in listed buildings, conservation areas, and prestigious period properties.
Grade II Listed Sash Windows
Grade II Listed Sash Windows
Acoustic Overhaul
Acoustic Overhaul
Victorian Bay Windows
Victorian Bay Windows
Georgian Townhouse Restoration
Georgian Townhouse Restoration
Conservation Area Specialist
Conservation Area Specialist
Sash Window Preservation
Sash Window Preservation
Acoustic Casement Glazing
Acoustic Casement Glazing
French Door & Garden Room
French Door & Garden Room
Victorian Bay Sash Installation
Victorian Bay Sash Installation
Transparent Pricing
Straightforward starting prices for the most common configurations. Every quote is bespoke to your property.
Small Casement
per window, fully installed
Ideal for bathrooms, kitchens, and side-facing casement windows in period properties.
Standard Victorian Sash
per window, fully installed
Our most popular configuration for traditional sliding sash windows across London terraces.
Large Georgian Bay
per window, fully installed
Multi-panel bay window systems for grand Georgian and Edwardian reception rooms.
Every installation includes:
Exact costs depend on dimensions and borough-specific planning requirements. All prices include VAT.
Make an Informed Decision
See why 1,200+ London homeowners chose professional installation last year.
2-3mm Acrylic Sheet
Vibrates at traffic frequencies, yellows within months
10.8mm Acoustic Laminated Glass
PVB interlayer converts sound energy into heat
Magnetic Tape Fixings
Peels away from painted frames, zero compression seal
Engineered Aluminium Frames
Precision-machined, powder-coated, compression-sealed
Minimal (15-20 dB)
Traffic, sirens, and aircraft still clearly audible
80% Reduction (up to 54 dB)
Heavy traffic becomes a faint murmur — near-silence
1-Year Lifespan
Acrylic crazes, tape degrades, seals fail after one winter
25-Year Service Life
Optically clear glass, zero maintenance, lifetime warranty
Average customer replaces DIY kits within 14 months
Free survey · No obligation · Same-week availability
2-3mm Acrylic Sheet
Vibrates at traffic frequencies, yellows within months
10.8mm Acoustic Laminated Glass
PVB interlayer converts sound energy into heat
Magnetic Tape Fixings
Peels away from painted frames, zero compression seal
Engineered Aluminium Frames
Precision-machined, powder-coated, compression-sealed
Minimal (15-20 dB)
Traffic, sirens, and aircraft still clearly audible
80% Reduction (up to 54 dB)
Heavy traffic becomes a faint murmur — near-silence
1-Year Lifespan
Acrylic crazes, tape degrades, seals fail after one winter
25-Year Service Life
Optically clear glass, zero maintenance, lifetime warranty
Based on independent testing to BS EN ISO 10140 standards. All professional installations include a lifetime warranty.
Secondary glazing delivers measurable thermal improvement and a tangible return on investment. Here are the numbers from our London installations.
Window U-Value
Before
5.0 W/m²K
After
1.8 W/m²K
Thermal transmittance drops by 64%, matching modern double glazing performance.
Typical EPC Rating
Before
Band E/F
After
Band C/D
Improvement of 1-2 EPC bands. Critical for landlords meeting the 2028 minimum C rating.
Heat Loss Through Windows
Before
100%
After
35%
60% reduction in heat escaping through single-glazed windows, verified across 1,000+ London properties.
Average Heating Cost
Before
£2,400/yr
After
£1,560/yr
Typical savings of £840 per year for a 4-bed period home. Full payback in 3-4 years.
60%
Heat Loss Reduction
Through windows
1-2 Bands
EPC Improvement
Typical uplift
3-4 Years
Full Payback
Through energy savings
25+ Years
Product Lifespan
Warranted performance
Every installation is a precision-engineered system. Here is exactly what goes into your secondary glazing and why each layer matters.
Original Sash Window
Preserved
Existing timber frame untouched. No planning permission required for listed buildings.
Acoustic Air Gap
150 mm
Optimised cavity width for maximum sound attenuation. Outperforms standard double glazing by up to 80%.
Acoustic Laminated Glass
10.8 mm
Two sheets of glass bonded with an acoustic PVB interlayer. Achieves Rw 45 dB sound reduction rating.
Slim-Profile Aluminium Frame
20 mm sight-line
Powder-coated to match existing joinery. Discreet installation that preserves period aesthetics.
Compression Seal System
EPDM rated
Continuous perimeter seal eliminates draughts and reduces heat loss by up to 60%. Rated for 25+ year service life.
Rw 45 dB
Sound Reduction
Laboratory tested
0.8 W/m²K
Thermal U-Value
60% heat loss reduction
BS 7412
British Standard
Fully compliant
25+ yrs
Service Life
Backed by warranty
Drag the slider to simulate your noise environment and see how our acoustic glazing transforms your Kensington, Westminster or Hampstead home.
Without Glazing
75 dB
Heavy traffic
With Secondary Glazing
21 dB
Whisper quiet
Your noise reduction with our 10.8mm Stadip Silence glass + 100mm air gap
54 dB
Reduction
72%
Quieter
Specialist knowledge of heritage properties, conservation area regulations, and planning requirements in every London borough.
W1 - Georgian townhouses & period properties
Secondary Glazing ChelseaSW3 - Heritage homes & stucco facades
Secondary Glazing WestminsterSW1 - Listed buildings & conservation areas
Secondary Glazing BelgraviaSW1 - Georgian terraces & garden squares
Secondary Glazing KensingtonW8 - Victorian villas & conservation areas
Secondary Glazing KnightsbridgeSW7 - Premium acoustic glazing
Secondary Glazing Notting HillW11 - White stucco terraces & sash windows
Secondary Glazing MaryleboneW1 - Regency properties & noise reduction
NW3 - Conservation area & listed buildings
Secondary Glazing St John's WoodNW8 - Regency villas & mansion flats
Secondary Glazing HighgateN6 - Georgian & Victorian properties
Secondary Glazing Primrose HillNW1 - Regency villas & pastel terraces
Secondary Glazing CamdenNW1 - Victorian terraces & noise reduction
Secondary Glazing Belsize ParkNW3 - Edwardian mansion blocks
Secondary Glazing Holland ParkW11 - Grand Victorian townhouses
Secondary Glazing RichmondTW9 - Flight path & riverside properties
Secondary Glazing GreenwichSE10 - UNESCO heritage quarter
Surrey - Country estates & period homes
Secondary Glazing Virginia WaterSurrey - Crown Estate heritage homes
Secondary Glazing WindsorBerkshire - Royal Borough historic town
Secondary Glazing AscotBerkshire - Country houses & period windows
Secondary Glazing BeaconsfieldBucks - Old Town conservation area
Secondary Glazing St AlbansHerts - Cathedral city heritage properties
Secondary Glazing SevenoaksKent - Listed buildings & Knole Park
We install secondary glazing across all London boroughs, from Westminster and Mayfair to Richmond and the Home Counties. Experts in listed building secondary glazing, acoustic noise reduction, and EPC improvement for period properties.
Technical knowledge and practical advice covering acoustic performance, EPC ratings, listed building regulations, and pricing.
Acoustic Deep Dive
How 10.8mm Stadip Silence glass and a 100-150mm air gap achieve up to 54dB noise reduction. Technical data, lab results, and real-world case studies from Marylebone to Kensington.
EPC Upgrade Guide
Data-driven guide showing how secondary glazing reduces heat loss by 60% and lifts EPC ratings by 1-2 bands. Essential for landlords meeting the 2028 minimum C requirement.
Heritage & Listed Buildings
Why no planning permission is typically required, how we work with conservation officers in Westminster and Chelsea, and how to preserve period features while gaining modern performance.
Price Calculator
Get an instant, no-obligation estimate for your property. Factor in window type, glazing option, and property size for an accurate London price.
Expert Knowledge
In-depth answers from our installation specialists, organised by the four areas that matter most.
Book your free installer survey today. Certified installation specialists with no obligation quotes guaranteed.