Northern Ireland
Rear extensions in County Londonderry
Rear extensions in County Londonderry: we cover 5 towns including Derry~Londonderry, Coleraine and Limavady, with design, approvals and the build under one contract.
What are homes in County Londonderry like to extend?
Semis and detached houses are typical of County Londonderry, and many have room for a rear extension within Northern Ireland's permitted development limits.
Rear extension prices in County Londonderry
Northern Ireland prices are the lowest in our range. Per square metre including VAT, standard specification:
| Extension | Per m² |
|---|---|
| Single-storey rear extension | £1,650–£2,700 |
| Two-storey (per m² across both floors) | £1,570–£2,350 |
| Side return | £2,000–£3,310 |
| Wraparound | £1,910–£3,130 |
| Glass-led | £2,440–£4,180 |
Planning and building rules in County Londonderry
Northern Ireland's permitted development rules allow a single-storey rear extension of 3 metres on terraced and semi-detached houses and 4 metres on detached houses, with a 4 metre height limit. Listed buildings, conservation areas and houses with removed rights need planning permission from the council.
Northern Ireland has no larger-extension prior approval route; anything beyond permitted development needs a planning application.
Northern Ireland's building regulations are administered by council building control teams, who approve the plans or a building notice and inspect the work through to completion.
There is no Party Wall Act in Northern Ireland; we agree any work affecting a shared wall or boundary directly with the neighbour, in writing.
Conservation areas, Areas of Outstanding Natural Beauty and listed buildings restrict permitted development in Northern Ireland.
Rear extensions we build in County Londonderry
- Rear extensions for bungalows
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Rear extension plans and planning applications
- Building Regulations for rear extensions
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for detached houses
Towns and districts in County Londonderry
The main places we cover in County Londonderry include Derry~Londonderry, Coleraine and Limavady, across postcode areas BT.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Derry~Londonderry | BT48 | Strabane (13.6 miles) |
| Coleraine | BT52 | Portstewart (3.8 miles) |
| Limavady | BT49 | Coleraine (12.6 miles) |
| Magherafelt | BT45 | Cookstown (9.4 miles) |
| Portstewart | BT55 | Coleraine (3.8 miles) |
Areas near County Londonderry
FAQ
Questions people ask
How much does a rear extension cost in County Londonderry?
As a guide, £1,650–£2,700 per square metre including VAT for a standard single-storey extension at Northern Ireland rates.
Do I need planning permission in County Londonderry?
Often not for a single-storey rear extension of up to 3 metres (4 metres detached) under Northern Ireland's permitted development rules, outside conservation areas.
Which towns in County Londonderry do you cover?
5 towns and districts, including Derry~Londonderry, Coleraine and Limavady.
Do you handle building control?
Yes. We apply to the council's building control team and hand over the completion certificate.