Secondary Glazing Cost London 2025
Transparent pricing for homes, listed buildings and conservation areas. No hidden fees, no hard sell — just honest quotes.
Get a Free QuoteQuick Price Guide — Cost Per Window
| Type | Cost Per Window | Notes |
|---|---|---|
| Lift-out panels | £180 – £250 | Basic removable panels; seasonal use |
| Horizontal slider | £200 – £300 | Good for sash windows; easy access |
| Vertical slider | £220 – £325 | Matches original sash operation |
| Hinged unit | £275 – £400 | Full access + ventilation; premium |
| Fixed panel | £150 – £220 | Non-opening; most affordable |
Prices include supply and professional installation. VAT included. London prices, 2025.
Full House Secondary Glazing Costs
| Number of Windows | Supply Only | Supply + Install |
|---|---|---|
| 4 windows | £900 – £1,200 | £1,350 – £1,950 |
| 6 windows | £1,350 – £1,800 | £2,100 – £2,900 |
| 8 windows | £1,800 – £2,400 | £2,800 – £3,600 |
| 10 windows | £2,250 – £3,000 | £3,700 – £4,200 |
Based on standard-sized windows (approx. 1200mm x 1500mm) with vertical sliding units. Larger windows, bay windows, or acoustic glass will increase costs.
What Affects Secondary Glazing Cost?
Window Size
Larger windows require more materials and labour. Bay windows and floor-to-ceiling sashes cost more than standard casements.
Glass Type
Standard 4mm float glass is most affordable. Acoustic laminate (6.4mm or 10.8mm) adds £30-80 per window for superior noise reduction.
Frame Finish
White powder-coated aluminium is standard. Woodgrain effects, RAL colour matching, or bronze finishes add £20-50 per window.
Property Access
Ground floor installations are straightforward. Upper floors, scaffolding requirements, or difficult access can add to costs.
Secondary Glazing vs Double Glazing — Cost Comparison
| Feature | Secondary Glazing | Double Glazing |
|---|---|---|
| Average cost per window | £200 – £350 | £400 – £800 |
| Installation time | 1 day (4-6 windows) | 2-3 days |
| Planning permission | Not required | Often required in CAs |
| Noise reduction | Up to 80% (45dB+) | 30-40% (25-30dB) |
| Listed buildings | Suitable | Usually prohibited |
| Preserves original windows | Yes | No |
Secondary glazing can significantly reduce your heating bills by minimising heat loss through windows.
Based on a typical 3-bedroom Victorian terrace in London. Actual savings depend on property size, existing glazing condition, and heating usage.
London vs Rest of UK Pricing
London prices are typically 10-20% higher than the national average due to higher labour costs, parking and access challenges, and the prevalence of period properties requiring bespoke solutions. However, the return on investment is often higher in London due to greater property value increases and higher energy costs.
How to Get an Accurate Quote
Submit Details
Fill in our quick form with your property details, window count, and any photos you have.
Free Survey
We'll visit to measure precisely, assess access, and understand your priorities (noise, heat, security).
Fixed-Price Quote
Receive a detailed, fixed-price quote within 48 hours. No hidden costs, no obligation.
Frequently Asked Questions About Pricing
Get a Free No-Obligation Quote
Book a free survey and receive a fixed-price quote within 48 hours. No hard sell, no hidden fees — just honest pricing.
Book Your Free Survey Today
No obligation. No pressure. Just honest advice from London's secondary glazing specialists.
Request a Free Survey