Window & double glazing installers in Greater London
1,616 companies · 26 towns & cities
Greater London has 1,616 active window and glazing businesses on the Companies House register. Choose a town below to see the companies listed there, or request free quotes from FENSA or Certass registered installers covering your postcode.
Why Greater London homeowners are upgrading their windows
Greater London took 613mm of rain and 21 frost days in 2025 — the freeze / thaw cycles that lift seals, warp frames and let moisture creep in behind old glazing. Across the county's 3,423,890 households, 46% live in a house (detached, semi or terraced) — that's a lot of Greater London homes with 8 – 12 windows each, most fitted with early double-glazing units that are well past their sealed-argon life.
Get 3 free quotesFree quotes below from FENSA / Certass installers active in Greater London — no obligation, most respond within 48 hours.
Weather: Open-Meteo historical archive, 2025 daily readings for Greater London.Housing: ONS Census 2021 (tables TS041 households, TS044 accommodation type), aggregated across Greater London's local authorities.
Largest towns in Greater London
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