Extending your home in Lisburn
From a small utility to a two-storey addition, we take on house extensions throughout Lisburn, starting with a free visit and a planning check.
- Postcode districtsBT10, BT11, BT17, BT27, BT28
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Areas we cover around Lisburn
We cover Lisburn and the postcode districts BT10, BT11, BT17, BT27, BT28. Nearby, we also take on projects in Belfast (7 miles), Castlereagh (7 miles), Newtownabbey (11 miles), Antrim (15 miles), Carrickfergus (16 miles). Just over the County Down border, Newtownards is about 15 miles away.
What works best for Lisburn houses?
In Northern Ireland, extension projects follow the NI planning rules and council building control, which we account for from the first survey.
For many houses here, side extensions, bungalow extensions or annexe extensions gives the most useful space for the budget.
What extensions cost in Lisburn
Use these Lisburn guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £21,500 – £28,000 |
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Double-storey extensions | 32 m² | £49,500 – £65,000 |
| Wraparound extensions | 25 m² | £49,000 – £62,500 |
| Side return extensions | 11 m² | £22,500 – £28,500 |
| Orangery extensions | 16 m² | £38,500 – £48,500 |
Approvals for an extension in Lisburn
In Northern Ireland the Planning (General Permitted Development) Order 2015 lets some single-storey rear extensions go ahead without planning permission, up to 3 m on a semi-detached or terraced house and 4 m on a detached house, within height and boundary limits. Larger, side and two-storey extensions normally need planning permission from the council, and building control approval is separate.
In a conservation area or area of townscape character the permitted development rights are more limited, listed homes need listed building consent, and if rights have been removed by a condition, any extension needs an application.
In Northern Ireland building control is run by the councils under the Building Regulations (Northern Ireland). We submit full plans or a building notice and book the inspections through to completion.
Applications are decided by your council, which handles local planning in Northern Ireland.
All extension types we build in Lisburn
- Utility and boot room extensions · from £12,000
- Porch extensions · from £3,400
- Annexe extensions · from £47,000
- Pitched roof extensions · from £19,000
- Kitchen extensions · from £23,000
- Building regulations for extensions · from £750
- Wraparound extensions · from £30,500
- Single-storey rear extensions · from £18,000
- Extensions over a garage · from £20,500
- Side return extensions · from £15,000
- Side extensions · from £18,500
- Conservatory replacement extensions · from £17,000
- Orangery extensions · from £25,500
- Extension plans and drawings · from £1,000
- Double-storey extensions · from £32,500
- Home office extensions · from £13,500
- Bungalow extensions · from £22,500
- Timber frame extensions · from £18,000
- Planning permission for extensions · from £300
- Glass box extensions · from £25,500
- Bedroom extensions · from £22,000
- Flat roof extensions · from £18,000
Free site visit
We visit your Lisburn home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Lisburn
How much does an extension cost in Lisburn?
Using our Northern Ireland factor (×0.86), a standard-spec single-storey extension of 20 m² is a guide £35,000 to £45,000 including VAT, and a 32 m² two-storey extension £49,500 to £65,000. Your written price follows the survey.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Lisburn?
Not always. It depends on the size, position and your property's history. In Northern Ireland some single-storey rear extensions are permitted development; larger ones need planning permission.
How long does an extension take in Lisburn?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Book a free site visit in Lisburn
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.