Pitched roof extensions in Downpatrick: design, approvals and build
From the first sketch to final sign-off, we plan and build pitched roof extensions in Downpatrick and the surrounding County Down area.
- Guide price in DownpatrickFrom £19,000 inc VAT
- PlanningNI permitted development (rear 3–4 m) or planning
- Build time10–16 weeks on site
- Postcode districtsBT30
Extensions in and around Downpatrick
Site visits are available across Downpatrick (BT30). We also work in nearby Newtownards (18 miles), Bangor, County Down (23 miles), Banbridge (23 miles), Newry (28 miles).
For homes towards County Antrim, Castlereagh is around 18 miles away. In Northern Ireland, extension projects follow the NI planning rules and council building control, which we account for from the first survey.
Included in a typical project
- Roof windows positioned for light and ventilation
- Insulation to current building regulations
- Lead or proprietary flashings to the main wall
- Vaulted ceilings or flat ceilings with storage above
- Roof design matched to the existing pitch and tiles
Matching tiles is harder than it sounds. We source reclaimed or closest-match tiles where the originals are no longer made and agree samples with you before ordering.
Do I need planning permission 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.
The planning position for a specific Downpatrick address depends on its history and any designations, which is why we check it at the first visit.
Building close to a public sewer needs the agreement of NI Water, which we check during design.
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.
What should I budget for a pitched roof extension in Downpatrick?
For Downpatrick we adjust our national guide rates by ×0.86, the factor we use for Northern Ireland. Figures include VAT; your written quote after the survey replaces them.
Typical rates in Downpatrick: £1,590 to £3,010 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 3 m × 4 m 12 m² | £19,000 – £22,500 | £22,000 – £28,500 | £28,000 – £36,500 |
| 4 m × 5 m 20 m² | £31,500 – £37,000 | £36,500 – £47,500 | £47,000 – £60,500 |
| 5 m × 6 m 30 m² | £47,500 – £55,500 | £55,000 – £71,000 | £70,500 – £90,500 |
For a figure based on your own dimensions, use our guide-price tool.
How the project works
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
We visit your Downpatrick home, measure up, talk through what you want and check the planning position.
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
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Your questions about a pitched roof extension in Downpatrick
How long does a pitched roof extension take to build in Downpatrick?
On site, typically 10 to 16 weeks once approvals are in place. Before that, allow 6–12 weeks design and approvals.
Do I need building regulations approval in Downpatrick?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Do you cover all of Downpatrick?
Yes. We cover Downpatrick and the surrounding parts of County Down. Site visits are free and there is no obligation.
How much does a pitched roof extension cost?
Our guide range is about £1,590 to £3,010 per m² including VAT, a little more than a flat roof because of the roof structure and tiles.
Can I have a vaulted ceiling?
Yes. A vaulted ceiling with roof windows is one of the main reasons to choose a pitched roof. It needs insulation between and under the rafters to meet the building regulations.
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.