Ballymena house extensions
Looking to extend your home in Ballymena? Start here: extension types, guide prices for Ballymena, the planning rules that apply and how a project runs.
- Postcode districtsBT42, BT43
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Where we work near Ballymena
Site visits are available across Ballymena (BT42, BT43). The same team covers Antrim (10 miles), Larne (18 miles), Newtownabbey (20 miles), Carrickfergus (21 miles), Belfast (23 miles), all within easy reach. For homes towards County Londonderry, Magherafelt is around 16 miles away.
What extensions cost in Ballymena
Every figure below is a guide for Ballymena, adjusted for Northern Ireland build costs (×0.86) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £38,500 – £48,500 |
| Wraparound extensions | 25 m² | £49,000 – £62,500 |
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Extensions over a garage | 12 m² | £21,500 – £28,000 |
| Side return extensions | 11 m² | £22,500 – £28,500 |
| Single-storey rear extensions | 20 m² | £35,000 – £45,000 |
Do extensions in Ballymena 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.
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.
Choosing the right extension in Ballymena
In Northern Ireland, extension projects follow the NI planning rules and council building control, which we account for from the first survey.
Start by comparing single-storey rear extensions, bungalow extensions and annexe extensions: between them they cover most of the layouts we see requested for houses like these.
All extension types we build in Ballymena
- Single-storey rear extensions · from £18,000
- Building regulations for extensions · from £750
- Extensions over a garage · from £20,500
- Annexe extensions · from £47,000
- Side extensions · from £18,500
- Home office extensions · from £13,500
- Orangery extensions · from £25,500
- Planning permission for extensions · from £300
- Kitchen extensions · from £23,000
- Bungalow extensions · from £22,500
- Pitched roof extensions · from £19,000
- Extension plans and drawings · from £1,000
- Double-storey extensions · from £32,500
- Bedroom extensions · from £22,000
- Conservatory replacement extensions · from £17,000
- Timber frame extensions · from £18,000
- Flat roof extensions · from £18,000
- Glass box extensions · from £25,500
- Wraparound extensions · from £30,500
- Utility and boot room extensions · from £12,000
- Porch extensions · from £3,400
- Side return extensions · from £15,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Ballymena
How much does an extension cost in Ballymena?
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.
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.
Do I need planning permission for an extension in Ballymena?
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.
Book a free site visit in Ballymena
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.