House extensions in Coleraine
From a small utility to a two-storey addition, we take on house extensions throughout Coleraine, starting with a free visit and a planning check.
- Postcode districtsBT52
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Popular extension prices in Coleraine
Use these Coleraine 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) |
|---|---|---|
| Wraparound extensions | 25 m² | £49,000 – £62,500 |
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Side return extensions | 11 m² | £22,500 – £28,500 |
| Double-storey extensions | 32 m² | £49,500 – £65,000 |
| Conservatory replacement extensions | 14 m² | £25,500 – £33,500 |
Areas we cover around Coleraine
We cover Coleraine and the postcode districts BT52. Neighbouring towns we cover include Limavady (13 miles), Magherafelt (26 miles), Derry/Londonderry (27 miles). Ballymena, in County Antrim, is roughly 24 miles from Coleraine and also on our list.
What works best for Coleraine 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, single-storey rear extensions, annexe extensions or bungalow extensions gives the most useful space for the budget.
Approvals for an extension in Coleraine
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.
Extension types and starting prices
- Single-storey rear extensions · from £18,000
- Wraparound extensions · from £30,500
- Building regulations for extensions · from £750
- Flat roof extensions · from £18,000
- Kitchen extensions · from £23,000
- Side return extensions · from £15,000
- Porch extensions · from £3,400
- Bungalow extensions · from £22,500
- Timber frame extensions · from £18,000
- Annexe extensions · from £47,000
- Home office extensions · from £13,500
- Planning permission for extensions · from £300
- Utility and boot room extensions · from £12,000
- Double-storey extensions · from £32,500
- Bedroom extensions · from £22,000
- Orangery extensions · from £25,500
- Glass box extensions · from £25,500
- Pitched roof extensions · from £19,000
- Conservatory replacement extensions · from £17,000
- Extensions over a garage · from £20,500
- Extension plans and drawings · from £1,000
- Side extensions · from £18,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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 Coleraine
How much does an extension cost in Coleraine?
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.
How long does an extension take in Coleraine?
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 I need planning permission for an extension in Coleraine?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Coleraine, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Coleraine
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.