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Over 7 million UK households suffer from noise pollution daily. Whether it's the constant rumble of traffic on the M25, aircraft roaring overhead from Heathrow, or late-night disturbances, unwanted noise affects your health, sleep quality, and overall wellbeing.
The World Health Organization classifies environmental noise as the second-largest environmental cause of health problems, just behind air pollution. In the UK, road traffic is the dominant source, affecting an estimated 11.1 million people exposed to noise levels above 55 dB during the day.
For those living near major roads like the A40, M1, or M25, noise levels regularly exceed 70-80 dB — equivalent to a vacuum cleaner running constantly outside your window. Near airports like Heathrow, Gatwick, or Manchester, aircraft noise can spike to 85 dB or more during peak hours.
The emotional toll is often underestimated. Families describe feeling trapped in their own homes, unable to enjoy their gardens, hold conversations without shouting, or get a peaceful night's sleep. Many consider moving, only to discover that selling a noise-affected property means accepting significantly reduced offers.
Chronic sleep disruption leading to fatigue, reduced concentration, and impaired immune function
Increased blood pressure and heart rate from constant noise exposure above 55 dB
Higher rates of anxiety, depression, and stress-related conditions in high-noise areas
Properties near busy roads can lose 10-20% of their value due to noise pollution
Secondary glazing offers a proven, cost-effective solution that can reduce noise by 40-80% — without the £20,000+ cost of full window replacement or the disruption of major building work. And for listed buildings where replacement windows aren't permitted, it's often the only viable option.
Think of secondary glazing as adding a second window inside your existing one. Rather than ripping out your current windows (messy, expensive, stressful), you're simply fitting an extra pane on the inside. Your original windows stay put, but you get all the benefits of double glazing without the hassle.
Here's what you actually get when you invest in secondary glazing (spoiler: it's quite a lot)
Reduce heat loss by up to 60% and cut your energy bills significantly.
Block up to 80% of external noise with acoustic glazing for a quieter, more peaceful home.
Eliminate condensation and prevent mould, damp, and window damage.
Additional layer of protection making break-ins more difficult.
Save up to 70% compared to full replacement double glazing.
Perfect for conservation areas where planning permission is difficult.
| Feature | Secondary Glazing | New Double Glazing |
|---|---|---|
| Cost | £600–£1,400 | £1,500+ |
| Noise Reduction | Up to 80% | Up to 40% |
| Thermal Insulation | 60–70% reduction | 70–80% reduction |
| Installation Time | 1–2 hours per window | 1–2 days per window |
| Planning Permission | No | Often Yes |
Secondary glazing delivers superior noise reduction for half the cost of full window replacement.
Understanding the physics behind noise reduction helps you make informed decisions about your glazing investment.
Sound travels as waves of pressure through the air. When these waves hit your window, the glass vibrates and transmits the sound energy into your home. The frequency of sound waves varies — low-frequency sounds like traffic rumble (around 100-500 Hz) are harder to block than higher-frequency sounds like voices or birdsong. This is why you might notice that double glazing reduces general chatter but still lets through the deep bass of passing lorries.
Here's a fact that surprises most homeowners: standard double glazing was designed for thermal insulation, not noise reduction. The typical 16-20mm air gap in double glazed units is optimised to prevent heat transfer, but it creates a resonance chamber that can actually amplify certain frequencies.
When both panes of glass are the same thickness (usually 4mm), they vibrate at the same frequency, creating a phenomenon called coincidence effect. This means certain sounds pass through almost unimpeded. It's why many people with modern double glazing still complain about traffic noise.
Secondary glazing works because it creates a much larger air gap — typically 100-150mm compared to 16-20mm in double glazing. This wider gap is crucial for several reasons:
For maximum noise reduction, we use laminated acoustic glass with a special PVB (polyvinyl butyral) interlayer. This interlayer acts as a dampening membrane, absorbing sound energy rather than transmitting it. A 6.4mm laminated pane outperforms a 10mm solid pane for noise reduction while being lighter and more practical.
Sound Transmission Class (STC) measures how well a structure blocks sound. Single glazing rates around STC 26-28. Standard double glazing achieves STC 28-32. Our secondary glazing systems achieve STC 40-50+, reducing perceived noise by 75-90%. Each 10-point increase represents a 50% reduction in perceived loudness.
Counter-intuitively, triple glazing often performs worse than secondary glazing for noise reduction. Why? Triple glazed units still have relatively small air gaps (typically 12-16mm each), and the addition of a third pane can create additional resonance frequencies.
Secondary glazing combined with existing double glazing gives you the best of both worlds: the thermal efficiency of modern sealed units plus the acoustic performance of a properly designed secondary system. The total air gap of 100-150mm+ creates dramatically better noise reduction than any sealed unit can achieve.
From first quote to finished windows - we'll walk you through the whole thing
Pop your details in our calculator or request a proper quote. Either way, you'll know what you're looking at cost-wise.
Someone who knows what they're doing comes round, measures up, and tells you exactly what'll work best for your place.
Accurate measurements taken to ensure perfect fit and optimal performance.
Trained fitters turn up, get on with it, and usually they're done by teatime. Seriously - it's that quick.
Enjoy your warmer, quieter home. Plus you've got a warranty and someone to call if anything needs tweaking.
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Open the Full Project Estimator →Our comprehensive 2026 price guide breaks down real London costs for Victorian sash windows, bay windows, and acoustic laminate glass — with worked examples and expert advice.
Read the 2026 Secondary Glazing Price GuideOn average, professional secondary glazing costs between £350 and £800 per window including installation. For DIY kits, prices start as low as £150 per window. The final price depends on the glass type—standard thermal glass is the most affordable, while 10.8mm Stadip Silence acoustic laminate for maximum soundproofing sits at the higher end of the scale.
Secondary glazing typically pays for itself within 5–7 years through reduced energy bills. By creating a sealed air gap of 100–200mm, it reduces heat loss by up to 60%, making it a more cost-effective and planning-friendly alternative to replacing windows in listed buildings or conservation areas.
Get a QuoteSee the dramatic improvements our customers experience
See how secondary glazing compares to complete window replacement
Winner on cost: Secondary glazing saves you up to 70% while delivering comparable performance
Calculate Your Project CostCompare different secondary glazing systems to find the perfect balance of cost, performance, and convenience for your needs.
Understanding these key factors will help you budget accurately and make informed decisions about your secondary glazing project.
Larger windows require more materials and labor. Complex shapes like bay windows or arched windows increase costs significantly.
Different materials offer varying benefits. Aluminium is durable and slim, uPVC is budget-friendly, timber matches traditional aesthetics.
Standard glass is cheapest, acoustic glass reduces noise dramatically, low-E glass improves thermal performance.
Ground floor, easy access windows are cheapest. Upper floors, awkward access, or structural issues increase labor costs.
Urban locations may have higher labor costs. Parking, access restrictions, and building regulations can affect pricing.
Bulk installations reduce per-window costs. Off-season installation may offer discounts.
See how secondary glazing has made a measurable difference to homeowners dealing with noise pollution.
Sarah and James couldn't sleep due to 24/7 traffic noise from the A40 Westway. Noise levels measured at 75 dB during peak times, dropping to only 62 dB at night. They'd considered moving but couldn't afford equivalent properties in quieter areas.
We installed 6.4mm laminated acoustic glass secondary glazing with 150mm air gap on all six street-facing windows. The existing sash windows were retained, with custom-made horizontal sliding secondary units fitted to the interior.
"We can finally sleep with the windows closed — and actually hear each other speak. It's transformed our quality of life."
Living directly under the Heathrow eastern approach, aircraft noise exceeded 80 dB every 90 seconds during peak hours. As a listed building, replacement windows weren't permitted. Standard double glazing had made no noticeable difference.
Conservation-style secondary glazing with slimline aluminium frames to satisfy listing requirements. 10.8mm acoustic laminated glass with maximum 200mm air gap to existing single-glazed sash windows.
"The conservation officer was impressed with how discrete the installation looks. More importantly, I can work from home without noise-cancelling headphones."
Located just 50 metres from the main Manchester-London railway line, the family experienced train noise from 5am to midnight. Vibration was also an issue, causing pictures to rattle on walls during high-speed services.
Heavy-duty secondary glazing with 12.8mm laminated glass and vibration-dampening mounting system. Installed on all eight railway-facing windows with enhanced acoustic seals.
"The vibration reduction was unexpected but brilliant. We'd lived with rattling pictures for years — now there's barely any movement even when the fast trains pass."
Ready to transform your home? Every installation includes a detailed before-and-after noise assessment.
Get Your Free Assessment"Saved £3,200 on our Victorian terrace compared to double glazing quotes. Installation took just 2 days and our heating bills dropped by 28%."
Sarah Mitchell
London
10 windows, hinged panels
Total: £4,100
"The noise reduction is incredible. We live near a busy road and can finally sleep peacefully. Well worth the £2,800 investment."
James Peterson
Manchester
7 windows, acoustic glass
Total: £2,800
"Our listed building required planning permission, but secondary glazing was approved immediately. No disruption to original windows and £350/year energy savings."
Emma Richardson
Edinburgh
12 windows, sliding panels
Total: £3,600
"Brilliant service from start to finish. The calculator gave us an accurate estimate and the installation was spotless. Energy bills down 25%."
Michael Turner
Birmingham
8 windows, horizontal sliding
Total: £3,200
"We were quoted £12,000 for double glazing. Secondary glazing cost us £4,500 and works just as well. Amazing value."
Helen Clarke
Bristol
11 windows, lift-out panels
Total: £4,500
Our streamlined 5-step process ensures a hassle-free experience from initial enquiry to enjoying your quieter, warmer home.
We visit your property to understand your specific needs
We prepare a comprehensive specification tailored to your property
Once you approve, we take exact measurements for manufacturing
Our trained fitters install your secondary glazing with minimal disruption
Your satisfaction and long-term support guaranteed
Most installations are completed within 3-4 weeks from initial enquiry. Book your free consultation today and take the first step towards a quieter home.
Book Free ConsultationOur network of trained installers covers all major UK cities and surrounding areas, with specialist knowledge of local noise sources and planning requirements.
From Zone 1 to the M25, we've installed secondary glazing in over 2,000 London homes. Particular expertise in properties affected by Heathrow flight paths, the A40 Westway, North Circular, and South Circular routes.
Common noise sources: Aircraft from Heathrow, City Airport, and major arterial roads
Specialist installations across Greater Manchester, Liverpool, and the Northwest. High demand around Manchester Airport flight paths and the M60/M62 corridors.
Common noise sources: Manchester Airport approaches and motorway networks
Serving Birmingham, the West Midlands, and East Midlands regions. Popular for properties near Birmingham Airport, HS2 routes, and major railway lines.
Common noise sources: Birmingham Airport, M6, M1, and railway lines
Extensive coverage across the Southeast, with particular expertise around Gatwick Airport approaches, the M25, and coastal areas with military flight paths.
Common noise sources: Gatwick Airport, M25, M3, and Channel ports
Full coverage across Scotland's central belt and major cities. Popular for traditional tenement properties and Georgian/Victorian homes in conservation areas.
Common noise sources: City centre traffic and Edinburgh/Glasgow airports
Serving Yorkshire, the Northeast, and Humberside. Strong demand around Leeds Bradford Airport and major transport corridors.
Common noise sources: Leeds Bradford Airport, A1(M), and East Coast Main Line
Don't see your area listed? We cover the entire UK mainland. Contact us for availability in your location.
View All LocationsEvery three months, we ring around installers in London, Manchester, Birmingham, and a few countryside spots too. Why? Because a quote in Chelsea looks very different to one in Cornwall. We want you to know what you'll actually pay, not some fantasy number.
Last Updated: January 2026
Next Review: April 2026
Price Sources: 50+ verified installers
Energy Data: Energy Saving Trust, BEIS
Look, these are guide prices based on what we're seeing in the market right now. Your actual quote might be different depending on what you need, where you live, and when you're buying. Always get at least three quotes from certified installers - you'll thank yourself later.
We audit 50+ UK installers every quarter to ensure our pricing is accurate.
Our guides are reviewed by glazing specialists with 20+ years of experience.
We help you choose the right glass—from 6.4mm laminated acoustic to 4mm thermal—without the sales pitch.
Most UK homeowners pay between £300 and £750 per window, depending on glass type and size.
Yes, because of the larger 100mm+ air gap, it can reduce noise by up to 80%, outperforming standard double glazing.
Usually no, even in conservation areas, as it is an internal alteration.
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