Window & double glazing installers in Belfast
524 companies · 79 towns & cities
Belfast has 524 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.
Local climate (2025)
Annual rainfall1,002mm
Frost days14
Max gust recorded136.1km/h
Temperature range-3.7° to 28.1°C
1,002mm of rain and 14 frost days in 2025 (13% more rain than the UK average) — worn seals and single glazing let more of that in here than in a drier county.
Source: Open-Meteo historical archive, 2025 daily readings for Belfast.
Largest towns in Belfast
Newry81 companiesBelfast66 companiesLondonderry31 companiesOmagh22 companiesCraigavon20 companiesDungannon19 companiesArmagh17 companiesBallymena17 companiesMagherafelt15 companiesLimavady14 companiesLisburn13 companiesBanbridge11 companies
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Newry (81)Belfast (66)Londonderry (31)Omagh (22)Craigavon (20)Dungannon (19)Armagh (17)Ballymena (17)Magherafelt (15)Limavady (14)Lisburn (13)Banbridge (11)Derry (11)Larne (11)Cookstown (10)Enniskillen (10)Antrim (9)Downpatrick (9)Bangor (8)Coleraine (8)Ballynahinch (7)Castlewellan (7)Co Down (6)Co Tyrone (5)Dungiven (5)Maghera (5)Newtownabbey (5)Ballyclare (4)Carrickfergus (4)Crumlin (4)Keady (4)Lurgan (4)Strabane (4)Castlederg (3)Newtownards (3)Ballymoney (2)Claudy (2)Co Antrim (2)Co Derry (2)Donaghadee (2)Feeny (2)Holywood (2)Kilkeel (2)Aghagallon (1)Annahilt (1)Annalong (1)Ardmore (1)Augher (1)Ballycastle (1)Ballygowan (1)Ballyhalbert (1)Ballymartin (1)Belcoo (1)Bellaghy (1)Bleary (1)Bushmills (1)Caledon (1)Carrickmore (1)Castledawson (1)Castlewaellan (1)Co Londonderry (1)Coalisland (1)Crossgar (1)Draperstown (1)Dromore (1)Drumquin (1)Eglinton (1)Gallbally (1)Garrison (1)Hamiltonsbawn (1)Letterbreen (1)Moneymore (1)Mowhan (1)Newcastle (1)Portadown (1)Portaferry (1)Rostrevor (1)Swatragh (1)Sydenham Business Park (1)