Security secondary glazing in Central London

How much should I budget for security secondary glazing in Central London?

Expect £594 to £1,794 including VAT (£495 to £1,495 plus VAT) per window for security secondary glazing in Central London. The written quote names the glass makeup, the price and the lead time before you commit.

Security secondary glazing is a separate slim window fitted on the room side of an existing window, glazed with laminated glass so it forms a second barrier. It leaves the original window untouched outside, which makes it a common choice for listed buildings, conservation areas and period sash windows.

What you can specify

Laminated glass in slim aluminium frames
Suits sash, casement and arched openings
Noise and draught reduction
Vertical sliding, horizontal sliding, hinged and lift-out styles
Colour-matched frames to suit the room
Low-E glass for better insulation

Fitting in Central London and nearby

We arrange surveys and fitting across Central London and the EC1A postcode district, and in nearby Pimlico (1 mile), Islington (2 miles) and Camden Town.

Greater London has every kind of glazing, from Georgian sashes and Victorian bays in conservation areas to high-street shopfronts, office curtain walling and new-build flats.

Common uses:

Offices in historic buildings
Listed homes and buildings in conservation areas
Period sash windows with original glass
Ground-floor flats in converted townhouses

What to think about first

Listed building consent

Internal secondary glazing is usually seen as reversible, but consent can still be needed. Check with the conservation officer first.

Frame colour and sightlines

Slim frames that line up with the existing meeting rails make the secondary glazing almost invisible from outside.

Consents and safety: England

England

Replacing glass in an existing frame

Replacing only the glass or sealed unit in an existing frame is generally treated as a repair in England rather than notifiable building work. Replacing a whole window or door is notifiable and is normally certified through a competent person scheme or approved by building control. Either way, new glass in a critical location should still be safety glass.

Windows needed for escape

Approved Document B expects many habitable rooms in houses, particularly upstairs, to have an escape window with a clear opening of at least 0.33 m², at least 450 mm high and 450 mm wide, with the bottom of the opening no more than 1,100 mm above the floor. Changing the glass does not alter that, but locks, secondary glazing and film must not stop the window opening. Laminated glass is hard to break through, so escape always relies on the window opening.

How it works

Guide price online or by phone
Survey in Central London
Accept the fixed quote
Fitted by glaziers working under our contract

Security secondary glazing in Central London: questions

Do you cover Pimlico as well as Central London?

Yes. As well as Central London, we can arrange surveys in nearby Pimlico, Islington and Camden Town. Dates depend on installer availability.

Do I need permission for secondary glazing in a listed building?

It depends on the building and the council. Internal secondary glazing usually has less impact than replacement windows, but listed building consent may still be needed. Ask the conservation officer before ordering.

Can I still open my sash windows?

Yes. Secondary glazing slides, hinges or lifts out so the original window can be opened and cleaned.

Is secondary glazing safe for escape windows?

It can be, as long as it opens quickly from inside without a key. We design catches and handles for that.

Security secondary glazing in nearby towns

Other glazing in Central London

Tell us about the glazing and we will come back with a guide price.