Castlereagh utility room extensions, designed and built
If you live in Castlereagh and want more space without moving, a utility room extension is one of the most practical ways to get it. We handle the drawings, approvals and the build.
- Guide price in CastlereaghFrom £12,000 inc VAT
- PlanningNI permitted development (rear 3–4 m) or planning
- Build time6–10 weeks on site
- Postcode districtsBT1, BT2, BT4, BT5, BT6
Extensions in and around Castlereagh
Across BT1, BT2, BT4, BT5, BT6, BT7, we can visit, measure and advise. The same team covers Belfast (2 miles), Newtownabbey (6 miles), Lisburn (7 miles), Carrickfergus (10 miles), all within easy reach.
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
- Design around appliances, sink and storage
- Built-in storage or space ready for your units
- Back door and a hard-wearing floor
- Ventilation for a tumble dryer
- Waste and water connections
A good utility works like a back-of-house corridor: in from the garden, boots off, coats on hooks, washing on the way through. We plan the door positions so it doesn't become another room to walk around.
Guide prices for Castlereagh
Prices below are for Castlereagh, using the Northern Ireland factor of ×0.86. They are guide ranges including VAT for the build only, not a quote.
Typical rates in Castlereagh: £1,630 to £3,010 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 2 m × 2.5 m 5 m² | £12,000 – £14,500 | £12,000 – £15,000 | £12,000 – £15,500 |
| 2.5 m × 3.2 m 8 m² | £13,000 – £15,500 | £15,000 – £19,500 | £19,000 – £24,500 |
| 3 m × 3.6 m 11 m² | £17,500 – £21,500 | £21,000 – £26,500 | £26,000 – £33,500 |
Want a range for your exact size? The guide-price tool takes about a minute.
Planning and approvals in Castlereagh
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.
Homes in conservation areas, areas of townscape character and listed buildings have tighter rules, so we always check the property's status and planning history before design starts.
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.
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.
From first visit to completion
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 Castlereagh 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
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 people ask about utility room extensions
Will my neighbours in Castlereagh be involved?
If a planning application is needed, the council notifies neighbours. Where work is close to a shared boundary, we agree access and protection with them in writing.
Do you cover all of Castlereagh?
Yes. We cover Castlereagh and the surrounding parts of County Antrim. Site visits are free and there is no obligation.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Castlereagh, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Can a utility have a toilet?
Yes, space permitting. A WC needs drainage and extraction, which we plan into the design.
How much does a utility room extension cost?
Our guide range is about £1,630 to £3,010 per m² including VAT, with a minimum of around £12,500. An 8 m² standard-spec utility is typically £15,000 to £19,500 in Castlereagh.
Book a free site visit in Castlereagh
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.