Secondary Glazing Specialists Serving London and the South East
Secondary Glazing Specialist is London's trusted provider of high-quality secondary glazing solutions for residential and commercial properties. With over two decades of experience, we have helped thousands of homeowners, landlords, and businesses improve their properties' thermal efficiency, reduce noise pollution, and enhance security—all while preserving the original character of their windows.
Unlike replacement double glazing, secondary glazing involves fitting a discreet internal window system behind your existing windows. This approach is particularly valuable for Victorian period properties, listed buildings, and homes in conservation areas where external alterations are restricted. Our slim aluminium frames and precision-engineered panels integrate seamlessly with original sash windows, casement windows, and Crittall-style frames without compromising their historic appearance.
Why Choose Secondary Glazing Over Replacement Windows?
Many property owners face a difficult choice when their windows underperform: replace them entirely or find an alternative solution. Replacement windows can be expensive, disruptive, and in many cases simply not permitted in conservation areas or listed buildings. Secondary glazing offers a practical, cost-effective alternative that delivers comparable—or often superior—performance benefits.
Noise Reduction Up to 80%
Secondary glazing creates a substantial air gap between your original window and the new internal panel—typically 100mm to 150mm. This cavity acts as a highly effective acoustic buffer, reducing external noise by 45 to 50 decibels. Our noise reduction secondary glazing is ideal for homes near busy roads in Central London, railways, airports, or urban centres. Acoustic glass options, including 6.4mm and 6.8mm laminated glass, provide exceptional sound insulation for the most challenging environments.
Thermal Efficiency Improvement of 65%
Heat loss through windows accounts for up to 30% of a building's total energy wastage. Our thermal insulation secondary glazing dramatically reduces this by creating an insulating barrier that prevents warm air from escaping during winter and keeps interiors cooler in summer. Customers typically report heating bill reductions of 15% to 25% following installation, with improved EPC ratings and eliminated cold spots near windows.
Enhanced Security
An additional layer of glazing creates a significant physical barrier against intruders. Our secondary glazing systems feature multi-point locking mechanisms and toughened or laminated glass options that resist forced entry. For ground-floor properties, basement flats in Central London, and commercial premises, this added security provides valuable peace of mind without the need for unsightly bars or grilles.
Listed Building Compliant
Whether you own a Grade I, II*, or II listed building or live in a conservation area, our secondary glazing is fully reversible and does not alter the external fabric of your property. Conservation officers regularly recommend our solutions as sympathetic improvements that maintain heritage value while delivering modern performance standards.
With over 15 years of experience, we specialise in secondary glazing for heritage properties, including Victorian sash windows, Georgian period properties, and Edwardian homes. Our expert team works closely with homeowners across North London, South London, West London, and East London to navigate planning requirements and deliver bespoke solutions that preserve architectural character while dramatically improving comfort and efficiency.
Secondary Glazing Types We Install
We offer a comprehensive range of secondary glazing systems to suit every window type and requirement. From vertical sliding sash systems that match traditional windows to fixed panels for maximum acoustic performance.
Specialist Secondary Glazing Services
We provide specialist glazing solutions for heritage properties including listed buildings, conservation areas, and period homes. Our expertise covers Victorian, Georgian, and Edwardian properties.
Our Installation Process
Every secondary glazing project begins with a comprehensive survey of your property. Our experienced surveyors assess your existing windows, discuss your specific requirements—whether noise reduction, thermal improvement, or security—and recommend the most appropriate system for your needs. Request a free survey today.
Free Survey and Quotation
We visit your property at a convenient time to take precise measurements and understand your priorities. You receive a detailed, no-obligation quote within 48 hours.
Bespoke Manufacturing
Each panel is manufactured to exact specifications at our London workshop. We use powder-coated aluminium frames available in white, brown, black, and bespoke RAL colours to complement your interior décor.
Professional Installation
Our skilled installers fit your secondary glazing with minimal disruption across Central London, Greater London, and the Home Counties. Most residential installations are completed within one to two days, with no external scaffolding required.
Aftercare and Guarantee
All installations include a comprehensive 10-year guarantee on frames and a 5-year guarantee on moving parts. We provide full maintenance guidance and offer a responsive repair service should any issues arise.
Technical Excellence: Our Glass Specifications
The performance of any secondary glazing system depends heavily on the glass specification. We use only the highest-grade materials, selected for their proven acoustic and thermal properties in demanding London environments.
10.8mm Stadip Silence Acoustic Laminate Glass
Our gold-standard acoustic specification for urban noise reduction. This laminated glass comprises two panes bonded with a specialised PVB (polyvinyl butyral) acoustic interlayer that absorbs sound vibrations at the molecular level. Combined with a 100mm air gap, it delivers up to 54dB noise reduction—the difference between a busy London high street and a quiet country lane.
- Targets low-frequency rumble from traffic, Tube lines, and aircraft
- Ideal for properties under Heathrow flight paths and near railway corridors
- Slim profile maintains discreet appearance for listed buildings
Pilkington K Glass™ Low-Emissivity Coating
For maximum thermal performance, we specify Pilkington K Glass with its microscopically thin metallic oxide coating. This low-emissivity (Low-E) glass reflects radiant heat back into the room while allowing natural light to pass through freely. The result: up to 60% improvement in heat retention compared to uncoated single glazing.
- Reduces U-values from 5.0 W/m²K (single glazed) to below 2.0 W/m²K
- Virtually invisible coating preserves natural light transmission
- Significantly improves EPC ratings for rental and sale properties
Combined specification: For the ultimate in both acoustic and thermal performance, we can pair 10.8mm acoustic laminate glass with a Pilkington K Glass Low-E coating on the same unit. This dual-purpose specification is particularly popular with owners of Victorian and Georgian properties seeking the highest possible comfort standards without any external alteration to their heritage windows.
Areas We Serve Across London
We provide specialist secondary glazing installations across every London borough, with particular expertise in heritage-rich areas where conservation compliance is essential.
Beyond the M25, we regularly work in Surrey, Kent, Buckinghamshire, Hertfordshire, and Essex via the Home Counties service area. Whether you own a Georgian townhouse in Hampstead, a Victorian terrace in Clapham, an Edwardian semi in Ealing, or a contemporary apartment in Canary Wharf, we have the expertise and experience to deliver outstanding results.
Helpful Resources
Request a Quote
Get a free, no-obligation quote for your property
Case Studies
See examples of our completed projects
FAQs
Find answers to common questions
Benefits
Learn about secondary glazing benefits
Repairs
Secondary glazing repair services
London Borough Noise Guide
Borough-by-borough soundproofing guide
Ready to Transform Your Windows?
Contact Secondary Glazing Specialist today for a free, no-obligation survey and quotation. Our friendly team is ready to discuss your requirements for noise reduction, thermal insulation, or heritage property solutions.
