Building services in Derry
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Derry
| Project | Guide range (inc VAT) |
|---|---|
| Kitchen extensions | £1,950–£2,900 per m² including a mid-range kitchen |
| Dormer loft conversions | £41,500–£58,500 for a typical rear dormer with en-suite |
| Garage conversions | £15,500–£26,000 for a single integral garage |
| House renovations | £750–£1,550 per m² for a medium to full renovation |
| Structural alterations and knock-throughs | £3,750–£8,250 for a typical knock-through with steel beam |
| Orangeries | £2,050–£2,900 per m² of floor area |
We start from a UK-wide guide and adjust it for Northern Ireland, where labour and materials are typically about 14% below average.
Planning permission in Derry
In Northern Ireland the Planning (General Permitted Development) Order (Northern Ireland) 2015 allows single-storey rear extensions of up to 3 metres on attached houses and 4 metres on detached houses, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary. Houses with removed rights need planning permission, listed buildings need consent, and in conservation areas extensions must stay single-storey and must not come forward of the front or side walls.
In Northern Ireland building control approval comes from the council, usually through a full plans application or a building notice, with inspections during the work and a completion certificate at the end.
About building in Derry
Northern Ireland has many detached and semi-detached homes on generous plots, which suits single-storey rear extensions and garage conversions.
Our Derry coverage includes postcode districts BT47, and we also work in nearby places such as Strabane, Limavady and Coleraine. Derry has a population of around 87,000.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 02
Drawings and written quote
We prepare the design and give you a written, itemised quote with inclusions and exclusions.
- 03
Permissions sorted
Applications, building control and neighbour arrangements, all before the start date.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions from homeowners in Derry
How much does a loft conversion cost in Derry?
A rear dormer loft conversion in Derry typically costs £41,500–£58,500 for a typical rear dormer with en-suite, including VAT.
Do you work in Derry?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Derry, including postcodes BT47.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
Do I need planning permission for an extension in Derry?
In Northern Ireland the Planning (General Permitted Development) Order (Northern Ireland) 2015 allows single-storey rear extensions of up to 3 metres on attached houses and 4 metres on detached houses, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary. Houses with removed rights need planning permission, listed buildings need consent, and in conservation areas extensions must stay single-storey and must not come forward of the front or side walls.
How much does an extension cost in Derry?
A single-storey extension in Derry typically costs £1,700–£2,500 per m² of floor area, and a double-storey extension £1,400–£2,150 per m² of floor area (both floors), including VAT.