Double glazing in Northern Ireland
uPVC windows in Northern Ireland typically cost £4,400 (3-bed semi, nine casement windows), with most between £3,100 and £7,000 including VAT. That is 12% below the UK average, because local installers charge around £145–£195 a day.
Covers Belfast, Londonderry, Lisburn, Newry, Bangor, Craigavon and the surrounding areas.
Windows prices in Northern Ireland
| Product | Typical here | UK typical |
|---|---|---|
| uPVC windows 3-bed semi, nine casement windows | £4,400 | £5,000 |
| Aluminium windows 3-bed semi, nine casement windows | £7,500 | £8,500 |
| Timber windows 3-bed semi, nine casement windows | £11,000 | £12,500 |
| Sash windows one uPVC sliding sash window | £790 | £900 |
| Bay windows one three-panel uPVC bay window | £1,700 | £2,000 |
| Tilt and turn windows one uPVC tilt and turn window | £570 | £650 |
| Triple glazing one triple glazed uPVC casement window | £610 | £700 |
| Secondary glazing one secondary glazed panel inside an existing window | £240 | £280 |
| Replacement glass units one misted sealed unit in a mid-sized window | £80 | £90 |
Guide prices including VAT, −12% against the UK average. Indicative, not quotations.
Doors prices in Northern Ireland
| Product | Typical here | UK typical |
|---|---|---|
| Composite front door one composite front door and frame | £1,200 | £1,400 |
| uPVC door one uPVC front or back door and frame | £740 | £840 |
| Bifold doors a three-panel aluminium set, about 3 m wide | £3,400 | £3,900 |
| French doors a pair of uPVC French doors and frame | £1,100 | £1,200 |
| Sliding patio doors a two-panel uPVC sliding patio door | £1,300 | £1,500 |
Guide prices including VAT, −12% against the UK average. Indicative, not quotations.
Windows and doors in Northern Ireland
Northern Ireland has its own Building Regulations, and replacement windows are signed off through council Building Control rather than FENSA, so ask how your installer will certify the work. The housing is newer than most of Great Britain, with many detached houses and bungalows ready for a second round of double glazing, and wind is the weather to design for.
Outside Belfast, many homes are detached houses and bungalows with exposed front doors, so a door rated for wind and weather is worth the money. Belfast's Victorian terraces take traditional-style composite doors well. As with windows, check how the installer will get the work signed off under the Northern Ireland regulations.
Northern Ireland has the highest rate of owner-occupation in the UK and a newer housing stock than most of Great Britain, with a large share of post-war and recent detached houses and bungalows outside Belfast. Belfast itself retains substantial Victorian terraced streets. The defining feature is fuel: around two thirds of homes are heated by oil rather than mains gas, far more than anywhere else in the UK.
Planning and building rules in Northern Ireland
Northern Ireland has its own Building Regulations, separate from both England and Scotland, and its own planning system administered by the eleven councils. Guidance written for England does not apply. Several Great Britain funding schemes do not extend here at all, which changes the economics of energy work substantially.
The weather
Mild, wet and windy, with rainfall above the UK average and few extremes of temperature in either direction. The mild winters shorten the heating season. Wind is the more demanding factor, particularly along the north and east coasts, where exposed sites take the full force of winter storms.
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