Window & double glazing installers in Cornwall
67 companies · 15 towns & cities
Cornwall has 67 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 Cornwall homeowners are upgrading their windows
Cornwall took 1,325mm of rain and 6 frost days in 2025. Those freeze / thaw cycles lift seals, warp frames and let moisture creep in behind older glazing. 44.6% of the county's 282,930 homes were built before 1965, back when single glazing was the norm. Retrofitting those windows is usually the single biggest heat-bill saving a homeowner can make. The county also carries 12,566 listed buildings on the National Heritage List. On those homes a full window replacement is not an option and secondary glazing is usually the route.
Get 3 free quotesFree quotes below from FENSA / Certass installers active in Cornwall. No obligation. Most respond within 48 hours.
Sources
Weather: Open-Meteo historical archive, 2025 daily readings for Cornwall.Housing: ONS Census 2021 (tables TS041 households, TS044 accommodation type), aggregated across Cornwall's local authorities.Housing age: VOA Council Tax stock of properties (CTSOP 4.0), 2024 snapshot, billing-authority-level rows aggregated to the county.Listed buildings: Historic England, National Heritage List for England, spatial join against ONS 2021 UTLA boundaries, retrieved 2026-09-17.
Largest towns in Cornwall
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