Window & double glazing installers in Hertfordshire

456 companies · 61 towns & cities

Hertfordshire has 456 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 Hertfordshire homeowners are upgrading their windows

Hertfordshire took 580mm of rain and 32 frost days in 2025. Those freeze / thaw cycles lift seals, warp frames and let moisture creep in behind older glazing. Across the county's 482,893 households, 76% live in a house (detached, semi or terraced). That's a lot of Hertfordshire homes with 8 to 12 windows each, plenty of them still on early double-glazing units well past their useful life.

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Free quotes below from FENSA / Certass installers active in Hertfordshire. No obligation. Most respond within 48 hours.

Rainfall580mm

Frost days32

Peak gust80.6km/h

Temp range-5° to 31.7°C

Households482,893

Houses (det + semi + terraced)76%

Flats20.5%

Weather: Open-Meteo historical archive, 2025 daily readings for Hertfordshire.Housing: ONS Census 2021 (tables TS041 households, TS044 accommodation type), aggregated across Hertfordshire's local authorities.

Largest towns in Hertfordshire

Watford56 companies Enfield43 companies Stevenage34 companies Borehamwood30 companies St Albans25 companies Barnet23 companies Hitchin19 companies Potters Bar15 companies Waltham Abbey14 companies Hatfield13 companies Hoddesdon13 companies Ware12 companies

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All towns in Hertfordshire

Watford (56)Enfield (43)Stevenage (34)Borehamwood (30)St Albans (25)Barnet (23)Hitchin (19)Potters Bar (15)Waltham Abbey (14)Hatfield (13)Hoddesdon (13)Ware (12)Welwyn Garden City (11)Biggleswade (9)Hertford (9)Letchworth Garden City (9)Rickmansworth (9)Waltham Cross (9)Bushey (8)Hertfordshire (6)Herts (6)Shefford (6)Buntingford (5)Harpenden (5)London Colney (4)Royston (4)Abbots Langley (3)Chorleywood (3)Kings Langley (3)Letchworth (3)London (3)Nazeing (3)Stanstead Abbotts (3)Welwyn (3)Wheathampstead (3)Baldock (2)Croxley Green (2)Henlow (2)Lower Stondon (2)Sandy (2)Welham Green (2)Arlesey (1)Barnet, London (1)Bassingbourn (1)Bayford (1)Broxbourne (1)Cheshunt (1)Cuffley (1)Goffs Oak (1)Heydon (1)Litlington (1)Meppershall (1)Middlesex (1)New Barnet (1)Nr Hitchin (1)Pindar Road, Hoddesdon (1)Redbourn (1)Sandon (1)Stevenage, Herts (1)Stotfold (1)Stotfold Hitchin (1)