An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Carmarthen is 22 miles north-west of Swansea. We price extensions for extra rooms there against Wales’s HMO rules and the council’s written HMO standards, so work is planned to the standard an inspection looks for. Carmarthen has a university population, so many shared houses are let to students on yearly tenancies, and summer is the main window for works.
- Area
- Carmarthenshire, Wales
- Postcodes
- SA31
- Location
- 22 miles north-west of Swansea
- Pricing region
- Wales
What do extensions for extra rooms in Carmarthen involve?
- Kitchen or bedroom fit-out
- Heating, insulation and glazing
- Foundations, structure and roof
- Planning route check and drawings
- Fire separation and detection extended to the new space
Which rules apply in Carmarthen?
The rules below are the Wales-wide position for this kind of work. Councils add their own standards and schemes on top, so we always check the address in Carmarthen before we price.
- 3–6 sharers is use class C4, and in Wales changing a house to C4 always needs planning permission; only C4 back to C3 is permitted development.
- Building regulations cover structural work, partitions, drainage, fire-resisting construction and electrics; confirm with building control whether the conversion is a material change of use.
- Council HMO standards and the fire risk assessment set detection, fire doors and escape routes.
- Kitchen and bathroom ratios are set in each council’s HMO standards.
How much do extensions for extra rooms cost in Carmarthen?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £32,900 – £56,400 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,700 – £3,750 | m² |
These are typical ranges including VAT, adjusted for Wales, where costs run below the UK average. The fixed price for a house in Carmarthen follows a site visit.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Carmarthen, tell us at the first call so the programme is built around it.
For student houses in Carmarthen, booking by spring is the safest way to make the summer gap.
When do Carmarthen landlords need it?
Landlords in Carmarthen most often ask us for this when:
- Moving to more sharers with consent
- Adding a ground-floor room
Questions about extensions for extra rooms in Carmarthen
Can I extend an HMO under permitted development?
Some extensions to houses are permitted development, but rules differ for HMOs and by nation and council. We check the address before design.
Do you cover all of Carmarthen?
Yes. We work across Carmarthen and the SA31 postcode areas, plus the rest of Carmarthenshire. Nearby places we also cover include Llanelli, Ammanford, Gorseinon.
Does a shared house in Carmarthen need an HMO licence?
In Wales, mandatory licensing covers HMOs of 3 or more storeys with 5 or more people. Many councils, including Cardiff and Swansea, also run additional licensing for smaller HMOs. Every landlord must register with Rent Smart Wales.
How much do extensions for extra rooms cost in Carmarthen?
Our guide ranges for Wales are in the table on this page, and the guide-price tool gives a figure for your house. A fixed written quote follows a free site visit.
Extensions for extra rooms near Carmarthen
- Llanelli · 13 mi
- Ammanford · 14 mi
- Gorseinon · 17 mi
- Clydach · 21 mi
- Swansea · 22 mi
- Neath · 25 mi
- All of Carmarthenshire
Other HMO services in Carmarthen
- Loft conversions for extra rooms in Carmarthen
- Communal kitchen refits in Carmarthen
- Layout changes and room reconfiguration in Carmarthen
- Large HMO conversions (7+ sharers) in Carmarthen
- Ensuite installation in Carmarthen
- House to HMO conversion in Carmarthen
- Damp, mould and HHSRS repairs in Carmarthen
- Rewires and EICR remedials in Carmarthen