Extensions in Newtownabbey: design, planning and build
From a small utility to a two-storey addition, we take on house extensions throughout Newtownabbey, starting with a free visit and a planning check.
- Postcode districtsBT3, BT14, BT15, BT36, BT37
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Do extensions in Newtownabbey need planning permission?
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.
Northern Ireland has no Party Wall Act. Where work is on or close to a shared boundary, we agree access and protection with your neighbour in writing before work starts.
Applications are decided by your council, which handles local planning in Northern Ireland.
Areas we cover around Newtownabbey
Across BT3, BT14, BT15, BT36, BT37, we can visit, measure and advise. The same team covers Belfast (4 miles), Carrickfergus (6 miles), Castlereagh (6 miles), Lisburn (11 miles), Antrim (13 miles), all within easy reach. Just over the County Down border, Bangor, County Down is about 10 miles away.
Newtownabbey extension prices at a glance
Prices on this page use our Northern Ireland factor of ×0.86, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Orangery extensions | 16 m² | £38,500 – £48,500 |
| Extensions over a garage | 12 m² | £21,500 – £28,000 |
| 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 |
| Single-storey rear extensions | 20 m² | £35,000 – £45,000 |
Choosing the right extension in Newtownabbey
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, annexe extensions or single-storey rear extensions gives the most useful space for the budget.
Choose an extension type
- Planning permission for extensions · from £300
- Double-storey extensions · from £32,500
- Wraparound extensions · from £30,500
- Single-storey rear extensions · from £18,000
- Pitched roof extensions · from £19,000
- Conservatory replacement extensions · from £17,000
- Building regulations for extensions · from £750
- Bungalow extensions · from £22,500
- Annexe extensions · from £47,000
- Utility and boot room extensions · from £12,000
- Porch extensions · from £3,400
- Timber frame extensions · from £18,000
- Extension plans and drawings · from £1,000
- Home office extensions · from £13,500
- Bedroom extensions · from £22,000
- Side extensions · from £18,500
- Extensions over a garage · from £20,500
- Orangery extensions · from £25,500
- Glass box extensions · from £25,500
- Kitchen extensions · from £23,000
- Flat roof extensions · from £18,000
- Side return extensions · from £15,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Newtownabbey
How much does an extension cost in Newtownabbey?
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 cover all of Newtownabbey?
Yes, including the surrounding parts of County Antrim. Site visits are free and there is no obligation.
Will my neighbours need to be told?
If you apply for planning permission the council notifies neighbours, and we agree access with them in writing for work near a shared boundary.
How long does an extension take in Newtownabbey?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Newtownabbey, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Newtownabbey
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.