How Much Does Secondary Glazing Cost?
Acoustic window prices from £350 per window. Our recommended 10.8mm Stadip Silence system starts at £500 per window — the most effective noise reduction glass available. Every quote includes a free noise survey, bespoke manufacture, professional installation, and post-install dB verification.
Acoustic Window Price Tiers
Three glass specifications to match your noise level and budget. All include professional installation and a written guarantee.
Essential
6.4mm Acoustic Laminate
Best for: Light sleepers near quiet residential streets
- 6.4mm laminated acoustic glass
- Slim aluminium frame
- 80–100mm air gap
- Suitable for most window types
- 10-year frame guarantee
Professional
10.8mm Stadip Silence
Best for: A-roads, railways, flight paths, nightlife streets
- 10.8mm Stadip Silence acoustic laminate
- Heavy-duty aluminium frame
- 100–200mm air gap
- Bespoke CNC-cut to the millimetre
- Heritage & listed building approved
- 15-year frame guarantee
- Post-install dB verification
Premium Heritage
10.8mm + Timber Subframe
Best for: Grade I/II listed, ultra-premium residences
- 10.8mm Stadip Silence acoustic laminate
- Hardwood timber subframe option
- 200mm+ optimised air gap
- Period-accurate colour matching
- Conservation officer liaison included
- Lifetime frame guarantee
- Dedicated project manager
Typical Project Costs
Realistic price ranges for common London property types. All prices include survey, manufacture, installation, and VAT.
| Property Type | Essential | Professional ★ | Premium Heritage |
|---|---|---|---|
| 1-bed flat (3–4 windows) | £1,050–£2,000 | £1,500–£3,600 | £2,700–£5,600 |
| 2-bed Victorian terrace (5–7 windows) | £1,750–£3,500 | £2,500–£6,300 | £4,500–£9,800 |
| 3-bed semi-detached (8–10 windows) | £2,800–£5,000 | £4,000–£9,000 | £7,200–£14,000 |
| 4-bed detached (12–16 windows) | £4,200–£8,000 | £6,000–£14,400 | £10,800–£22,400 |
| 5+ bed townhouse (18–24 windows) | £6,300–£12,000 | £9,000–£21,600 | £16,200–£33,600 |
What's Included in Every Quote
Free Noise Survey
We visit your property, measure dB levels room-by-room, and recommend the right glass specification.
Bespoke Manufacture
Every frame is CNC-cut to the millimetre from your survey measurements. No off-the-shelf sizes.
Professional Installation
Fitted by our trained acoustic glazing specialists. Most homes completed in a single day.
Post-Install dB Verification
We measure the actual noise reduction achieved and provide a written report for your records.
Secondary Glazing vs Alternatives
How acoustic secondary glazing compares on cost and performance.
| Solution | Cost / Window | Noise Reduction | Planning Needed? |
|---|---|---|---|
| Secondary Glazing (10.8mm) | £500–£900 | 45–50dB | No |
| Double Glazing Replacement | £800–£1,500 | 25–30dB | Often yes |
| Triple Glazing Replacement | £1,200–£2,000 | 30–35dB | Often yes |
| DIY Magnetic Inserts | £150–£350 | 15–25dB | No |
| Heavy Curtains / Blinds | £50–£200 | 5–10dB | No |
Read our full secondary glazing vs double glazing comparison or explore DIY vs professional installation.
Pricing FAQs
How much does secondary glazing cost in London?
Secondary glazing in London starts from £350 per window for 6.4mm acoustic laminate and £500–£900 per window for our recommended 10.8mm Stadip Silence glass. A typical 3-bedroom Victorian terrace costs £4,000–£9,000 fully installed. London pricing includes a modest uplift for travel, parking, and congestion zone costs.
What affects the price of acoustic window inserts?
The main factors are: glass specification (6.4mm vs 10.8mm), window size and shape (bays and arches cost more), frame material (aluminium vs timber), number of windows (volume discounts apply from 6+), and access difficulty (scaffolding, high floors). Heritage properties requiring colour-matching or conservation officer liaison also carry a premium.
Is secondary glazing cheaper than replacing windows?
Yes — typically 40–60% cheaper. Window replacement costs £800–£1,500 per window and often requires planning permission for listed buildings. Secondary glazing is installed internally in hours, not days, with no planning paperwork and better noise reduction thanks to the larger air gap.
Do you offer payment plans or finance?
Yes. We offer interest-free payment plans on projects over £2,000. Spread the cost over 6 or 12 months with no credit check required for existing homeowners. We also accept payment on completion for added peace of mind.
Are there any grants for secondary glazing in 2026?
Several UK grants can subsidise secondary glazing, including the ECO4 scheme, local authority Home Upgrade Grants, and conservation area grants from Historic England. Read our complete guide to secondary glazing grants for eligibility details.
What's included in the price?
Every quote includes: free noise survey and dB measurement, bespoke CNC-cut frames, premium acoustic glass, professional installation (typically 1 day), post-install dB verification, full guarantee, and a 30-day satisfaction check. There are no hidden costs — the price you see is the price you pay.
Related Resources
Cost Estimator Tool
Get an instant ballpark price — enter your window count, size, and postcode.
Glass Specifications
Compare STC ratings and dB reduction for every glass type — understand what you're paying for.
Traffic Noise Solutions
How we engineer silence for homes on A-roads and busy bus routes.
Aircraft Noise Solutions
Specialist glazing for homes under Heathrow and Gatwick flight paths.
How Secondary Glazing Works
The science behind 10.8mm laminate, air gaps, and why it outperforms double glazing.
Soundproof Windows Cost UK
Full cost breakdown by window type, whole-property estimates, and an interactive ROI calculator.
Grants & Funding Guide 2026
ECO4, local authority grants, and conservation area funding that could reduce your costs.
Landlord ROI Calculator
Calculate your return on investment, EPC improvements, and rental yield uplift from secondary glazing.