Utility and boot room extensions across Carmarthen
A utility room extension in Carmarthen starts with the right design and the right approval route. We take care of both, then build it with our own project management.
- Guide price in CarmarthenFrom £13,000 inc VAT
- PlanningWelsh permitted development rules (rear up to 4 m)
- Build time6–10 weeks on site
- Postcode districtsSA31
Working in Carmarthen
Postcode districts we cover around Carmarthen include SA31. Nearby, we also take on projects in Llanelli (13 miles), Ammanford (14 miles), Haverfordwest (29 miles), Pembroke Dock (29 miles).
In Wales, terraced houses with rear offshoots are common in the towns, while detached houses and bungalows dominate in rural areas.
Do I need planning permission in Carmarthen?
In Wales a single-storey rear extension can usually project up to 4 m beyond the rear wall without a planning application, if it is no more than 4 m high, keeps eaves to 3 m and overall height to 4 m within 2 m of a boundary, and covers no more than half the land around the original house. Wales has no larger home extension prior approval scheme.
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
The Party Wall etc. Act 1996 applies in Wales as in England: notice must be served before work to a shared wall, building on the boundary, or excavating close to a neighbour's foundations.
Building over or within 3 m of a public sewer needs the water company's consent before the foundations go in.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
How much does a utility room extension cost in Carmarthen?
These guide figures apply our Wales adjustment (×0.93) to national rates. They include VAT at 20% and cover the build itself; design and council fees are listed separately.
Typical rates in Carmarthen: £1,770 to £3,260 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 2 m × 2.5 m 5 m² | £13,000 – £15,500 | £13,000 – £16,500 | £13,000 – £16,500 |
| 2.5 m × 3.2 m 8 m² | £14,000 – £17,000 | £16,500 – £21,000 | £20,500 – £26,500 |
| 3 m × 3.6 m 11 m² | £19,000 – £23,500 | £23,000 – £29,000 | £28,500 – £36,000 |
Want a range for your exact size? The guide-price tool takes about a minute.
Included in a typical project
- Back door and a hard-wearing floor
- Waste and water connections
- Built-in storage or space ready for your units
- Ventilation for a tumble dryer
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
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Common questions in Carmarthen
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Carmarthen, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Who do I contract with for a utility room extension in Carmarthen?
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.
Do I need building regulations approval in Carmarthen?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
Can a utility have a toilet?
Yes, space permitting. A WC needs drainage and extraction, which we plan into the design.
Does a utility extension need planning permission?
Often not, if it is single storey and within permitted development limits. We check this for your property.
Book a free site visit in Carmarthen
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.