City Sound Secondary Glazing
Secondary glazing specialists serving London
About City Sound Secondary Glazing
City Sound is a family-run secondary glazing company founded by Derrick Smith in 1968. His son Andrew now runs the business, and Derrick remains involved. The company serves residential and commercial clients, focusing mainly on London and the M25 while accepting enquiries for larger projects elsewhere in the country.
It manufactures aluminium secondary glazing and installs an independent internal window alongside the existing one, leaving the original window untouched. Options include vertical sash, horizontal sliding, fixed, lift-out and hinged casement windows, plus shaped and arched designs. Units are made to match the primary window and can be finished in a chosen RAL colour.
Homeowners use secondary glazing to reduce outside noise, improve thermal insulation, limit draughts and condensation, and add security, including in listed or conservation-area properties. The company says it can help with planning permission and liaise with planning officers. Its site states a 12-year guarantee on workmanship and materials, alongside a dedicated residential after-sales service.
Areas covered
- London
- Aldgate
- Aldwych
- Angel
- Bankside
- Barbican
- Barnsbury
- Battersea
- Bayswater
- Belgravia
- Bermondsey
- Blackfriars
Services
Secondary glazing
- Vertical sliding sash windows
- Horizontal sliding windows
- Fixed and lift-out windows
- Hinged casement windows and doors
- Shaped and arched windows
What it helps with
- Noise reduction
- Thermal insulation
- Draught exclusion
- Condensation reduction
- Additional security
What their website says about each service
- Bespoke Windows & Doors
“Each of our quality secondary glazing units is uniquely designed and bespoke to our client.”
- Glaziers
“Secondary glazing is a fully installed window that operates independently from the existing window.”
- Soundproofing
“Secondary Glazing is the most effective option of reducing noise travelling through windows and doors.”