House extensions in Downpatrick
Every type of house extension in Downpatrick, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsBT30
- Price regionNorthern Ireland (×0.86)
- Planning rulesNorthern Ireland
- Site visitFree, no obligation
Which extension suits a Downpatrick 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, side extensions, bungalow extensions or single-storey rear extensions gives the most useful space for the budget.
Guide prices for Downpatrick
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) |
|---|---|---|
| Side return extensions | 11 m² | £22,500 – £28,500 |
| Orangery extensions | 16 m² | £38,500 – £48,500 |
| Single-storey rear extensions | 20 m² | £35,000 – £45,000 |
| Wraparound extensions | 25 m² | £49,000 – £62,500 |
| Kitchen extensions | 20 m² | £36,000 – £46,000 |
| Conservatory replacement extensions | 14 m² | £25,500 – £33,500 |
| Extensions over a garage | 12 m² | £21,500 – £28,000 |
Areas we cover around Downpatrick
Across BT30, we can visit, measure and advise. The same team covers Newtownards (18 miles), Bangor, County Down (23 miles), Banbridge (23 miles), Newry (28 miles), all within easy reach. Just over the County Antrim border, Castlereagh is about 18 miles away.
Planning and building control in Downpatrick
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
- Pitched roof extensions · from £19,000
- Side return extensions · from £15,000
- Planning permission for extensions · from £300
- Extension plans and drawings · from £1,000
- Bungalow extensions · from £22,500
- Annexe extensions · from £47,000
- Kitchen extensions · from £23,000
- Bedroom extensions · from £22,000
- Porch extensions · from £3,400
- Wraparound extensions · from £30,500
- Extensions over a garage · from £20,500
- Home office extensions · from £13,500
- Single-storey rear extensions · from £18,000
- Glass box extensions · from £25,500
- Flat roof extensions · from £18,000
- Building regulations for extensions · from £750
- Double-storey extensions · from £32,500
- Orangery extensions · from £25,500
- Timber frame extensions · from £18,000
- Conservatory replacement extensions · from £17,000
- Utility and boot room extensions · from £12,000
- Side extensions · from £18,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Downpatrick
How much does an extension cost in Downpatrick?
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 Downpatrick?
Yes, including the surrounding parts of County Down. Site visits are free and there is no obligation.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Downpatrick, and the guide-price tool gives a range for your own size and finish in about a minute.
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 Downpatrick?
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 Downpatrick
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.