All 32 London Boroughs · Listed & Conservation Specialists
Secondary Glazing in London
From Georgian townhouses in Kensington to warehouse conversions in Wapping, we fit discreet, reversible secondary glazing that keeps London's period windows exactly as they should be — while cutting heat loss by up to 75% and street noise by up to 80%.
- FENSA
- Which?
- CERTASS
- TrustMark
Built for London homes
The capital's period homes need a specialist touch
London has one of the densest concentrations of protected housing in the country. Vast swathes of the city sit within conservation areas, and tens of thousands of homes are listed — from the Georgian terraces of Islington and Spitalfields to the stucco-fronted villas of Notting Hill and the red-brick mansion blocks of Marylebone. For most of these properties, replacing the original windows simply isn't an option.
That's exactly where secondary glazing comes into its own. Fitted discreetly to the room side of your existing windows, it leaves the historic glass and timber untouched, needs no planning permission in almost every case, and can be removed entirely without trace. It's the upgrade Historic England recommends — and the one London's conservation officers are happiest to approve.
Where we work
Secondary glazing across every London borough
Local surveyors covering the whole capital, with deep experience of each area's housing stock and planning rules.
West London
Kensington, Chelsea, Notting Hill, Holland Park, Fulham & Hammersmith — white-stucco terraces and grand garden-square townhouses.
North London
Hampstead, Highgate, Islington, Primrose Hill & St John's Wood — Victorian villas and Georgian terraces in tightly protected conservation areas.
Central London
Marylebone, Bloomsbury, Fitzrovia, Pimlico & Belgravia — listed Georgian townhouses and mansion blocks where original sashes must stay.
East London
Spitalfields, Shoreditch, Wapping & Canary Wharf — Huguenot Georgian houses, warehouse conversions and riverside apartments.
South London
Dulwich, Clapham, Greenwich, Blackheath & Wandsworth — Victorian and Edwardian terraces near busy commuter routes.
South West London
Richmond, Wimbledon, Putney & Barnes — period family homes close to the river and under the Heathrow flight path.
London architecture
Tailored to the way London was built
No two London windows are quite the same. We match every system to the period and proportions of your home.
Georgian townhouses
Tall, slender box-sash windows with fine glazing bars. Our vertical sliding units mirror these proportions so the upgrade is all but invisible from the street.
Victorian terraces
London's most common period home, with two-over-two sashes and bay fronts. Slim secondary glazing restores warmth without altering the original timber.
Edwardian semis & villas
Wider bays and leaded lights respond beautifully to bespoke side-hung and bay-shaped panels tailored to each opening.
Mansion blocks & conversions
Red-brick mansion flats and warehouse conversions gain real acoustic relief from busy roads and railways with discreet acoustic glazing.
A quieter London home
Silence the city without losing your windows
London is loud. Acoustic secondary glazing is the most effective way to reclaim the quiet — without touching your period sashes.
The Tube & rail
Overground lines, mainline termini and surface sections of the Underground generate constant low-frequency rumble that acoustic glazing tames.
Traffic & red routes
Homes on busy A-roads and red routes see the biggest gains — up to 80% perceived noise reduction with laminated acoustic glass.
Flight paths
Properties under the Heathrow and City Airport approaches benefit from a wide cavity and specialist glass tuned to aircraft frequencies.
Up to 75%
less heat loss through your original windows
Up to 80%
less external noise with acoustic glass
Since 1973
family-run, FENSA-registered, fully guaranteed
Transparent pricing
What does secondary glazing cost?
Secondary glazing is priced per window, and the final cost depends on size, system type, glass specification and frame finish. The figures below are typical retail ranges for installed secondary glazing units in London and Hertfordshire — every survey we provide is fixed, written and free of obligation.
| System type | Typical size | Standard 4mm glass | Acoustic / thermal glass |
|---|---|---|---|
| Lift-out / fixed panel | Small (up to 0.8m²) | £350–£550 | £450–£700 |
| Horizontal sliding | Medium (0.8–1.5m²) | £450–£750 | £600–£950 |
| Vertical sliding sash | Medium (0.8–1.5m²) | £550–£900 | £700–£1,200 |
| Side-hung casement | Medium (0.8–1.5m²) | £500–£850 | £650–£1,100 |
| Bespoke bay / angled | Per bay (3–5 panels) | £1,400–£2,800 | £1,900–£3,800 |
Prices include survey, manufacture and installation. Frame colours, hardware finish and glass specification are all included in your fixed written quote — no hidden extras.
Volume discounts available for whole-house installations (5+ windows). Many of our customers spread payments across a 2–3 month installation programme — ask us about phased works during your survey.
How it works
From first call to aftercare
- 01
Free London survey
A specialist surveyor visits your home, measures each window and recommends the right system for the period and the planning context.
- 02
Design
We design discreet units matched to your sightlines, with your choice of acoustic, thermal or security glass.
- 03
Manufacture
Every panel is made to measure to the exact dimensions of your original London windows.
- 04
Installation
Our own fitters install cleanly in a day for most homes, protecting your floors and original windows throughout.
- 05
Aftercare
Your installation is fully guaranteed, with friendly local aftercare whenever you need it.
Recent London projects
A selection of our work across the capital
From listed Georgian townhouses to riverside apartments, here's how we've helped London homeowners stay warm and quiet.
Hampstead, NW3
Vertical sliding sash glazing to a Victorian terrace in a conservation area
Spitalfields, E1
Lift-out panels for a Grade II listed Georgian townhouse
Crouch End, N8
Bay-window glazing to an Edwardian home near a busy junction
Canary Wharf, E14
Acoustic sliding glazing for a riverside apartment under the flight path
FAQs
Secondary glazing in London — FAQs
Ready to improve your London home?
Book a free, no-obligation quote today. Friendly advice, honest pricing and no pushy sales.