Larne house extensions
We design and build house extensions for homes in Larne and the surrounding County Antrim area, with guide prices adjusted for the region.
- Postcode districtsBT40
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Popular extension prices in Larne
We publish guide prices so you can budget before anyone visits. For Larne they are adjusted by ×0.86, the factor we use across Northern Ireland.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £38,500 – £48,500 |
| Side return extensions | 11 m² | £22,500 – £28,500 |
| Double-storey extensions | 32 m² | £49,500 – £65,000 |
| Wraparound extensions | 25 m² | £49,000 – £62,500 |
| Extensions over a garage | 12 m² | £21,500 – £28,000 |
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Conservatory replacement extensions | 14 m² | £25,500 – £33,500 |
Which extension suits a Larne home?
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, annexe extensions, bungalow extensions or side extensions gives the most useful space for the budget.
Approvals for an extension in Larne
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.
Where we work near Larne
Site visits are available across Larne (BT40). Nearby, we also take on projects in Carrickfergus (9 miles), Newtownabbey (14 miles), Belfast (18 miles), Antrim (18 miles), Ballymena (18 miles). Just over the County Down border, Bangor, County Down is about 14 miles away.
Choose an extension type
- Home office extensions · from £13,500
- Planning permission for extensions · from £300
- Utility and boot room extensions · from £12,000
- Bungalow extensions · from £22,500
- Single-storey rear extensions · from £18,000
- Kitchen extensions · from £23,000
- Wraparound extensions · from £30,500
- Double-storey extensions · from £32,500
- Glass box extensions · from £25,500
- Flat roof extensions · from £18,000
- Orangery extensions · from £25,500
- Conservatory replacement extensions · from £17,000
- Extension plans and drawings · from £1,000
- Annexe extensions · from £47,000
- Timber frame extensions · from £18,000
- Porch extensions · from £3,400
- Side return extensions · from £15,000
- Bedroom extensions · from £22,000
- Pitched roof extensions · from £19,000
- Building regulations for extensions · from £750
- Extensions over a garage · from £20,500
- Side extensions · from £18,500
Free site visit
We visit your Larne home, measure up, talk through what you want and check the planning position.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Larne
How much does an extension cost in Larne?
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.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
How long does an extension take in Larne?
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Larne
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.