Window & double glazing installers in Dorset
237 companies · 22 towns & cities
Dorset has 237 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 Dorset homeowners are upgrading their windows
Dorset took 1,065mm of rain and 22 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 343,103 households, 73% live in a house (detached, semi or terraced) — that's a lot of Dorset 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 Dorset — no obligation, most respond within 48 hours.
Weather: Open-Meteo historical archive, 2025 daily readings for Dorset.Housing: ONS Census 2021 (tables TS041 households, TS044 accommodation type), aggregated across Dorset's local authorities.
Largest towns in Dorset
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