The 10 window and door fitters from Google's results for Belfast, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
Northern Ireland has separate planning and building control.
on GoogleBelfast
Northern Windows and Joinery fits uPVC, composite, and timber doors alongside casement and sliding sash windows in Belfast. In addition to window and door installations, the business supplies conservatories and wooden staircases across Northern Ireland.
028 9074 2111 476b Oldpark Rd, Belfast BT14 6QH
on GoogleNewtownabbey
Windows 4 U fits uPVC windows, composite doors, and bifolding doors for homes in Belfast and Newtownabbey. The installer also constructs sunrooms and conservatories, as well as replacing roofline fascias and guttering.
028 9036 4784 8 Abbeycroft Dr, Newtownabbey BT37 0YJ
on GoogleBelfast
Focus Windows NI supplies and fits uPVC doors and windows for domestic clients in Belfast. The firm also installs conservatories, sunrooms, dry verges, and roofline products including fascias, soffits, and guttering.
028 9077 7578 13, Graham Industrial Park, 121 Dargan Cres, Belfast BT3 9LP
on GoogleBelfast
The Home Design Group supplies and installs uPVC and aluminium windows, exterior doors, and roofline products for homes in Belfast. The business also fits custom kitchens throughout Northern Ireland.
028 9077 2077 Units 4 - 6, Nella House, 96 Dargan Cres, Belfast BT3 9JP
on GoogleNewtownabbey
Sfg Windows and Doors Belfast displays a range of composite, uPVC, and Palladio doors at its Newtownabbey showroom. The installer fits residential doors, conservatories, and sunrooms across the local region.
028 9086 8791 129-131 Whitewell Rd, Newtownabbey BT36 7EX
on GoogleAdvantage Wy, Belfast
Total Home Improvements builds house extensions and installs windows and doors across Belfast and Northern Ireland. Its fitting services cover casement, sash and tilt-and-turn windows alongside bifold, patio and composite doors.
028 9072 9688 Ind Est, Unit 2 Ballygomartin, Advantage Wy, Belfast BT13 3LZ
on GoogleTwin Spires, Belfast
Ok Windows designs and fits double glazed windows, doors, and conservatories from its base at Twin Spires in Belfast. Its offerings include timber window frames, specialty stained glass products, and home glass replacements.
028 9031 2999 Mill House, Northumberland St, Twin Spires, Belfast BT13 2JF
Antrim, Lisburn
Turkington Windows supplies and installs uPVC and aluminium windows for residential properties across Antrim, Lisburn, and the wider Northern Ireland region. The team fits both new and replacement window systems to suit various property styles.
028 9266 8883 County, 17 Linenhall St, Antrim, Lisburn BT28 1FJ
Belfast
uPVC Windows Belfast provides installation services for uPVC windows and doors across Belfast. The company fits replacement double-glazed units and new exterior doors for homeowners in the local area.
Belfast
Fitting PVC windows and doors, this Belfast business handles new installations as well as repair and maintenance work. Its product range includes composite doors, bi-folding doors, and both internal and external window sills.
In Belfast, upvc window typically costs £350 – £700. Labour in County Antrim runs 12% below the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "window fitters belfast". They are ranked on Google rating, online presence and other factors.
The figures above are Belfast ranges. These explain what drives them, so you can read a quote properly.
2026 prices per window and for a whole house in uPVC, aluminium and timber, the extras a quote can leave out, and the certificate and planning rules in each UK nation.
The size limits that let a conservatory go up without planning permission in England, when the building regulations exemption applies and how it is lost, and the rules in Wales, Scotland and NI.
What mist between the panes means, why it will not go away, what a new sealed unit costs in 2026, when the whole window is worth replacing, and the rules for replacing only the glass.
Replacement windows must meet building regulations for thermal performance. A FENSA registered installer self-certifies and sends you a certificate. An unregistered one means you need a building control application, and no certificate is a problem when you sell.