An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In Nelson (Caerphilly), a town of about 13,000 people, the work is planned around the HMO rules for Wales and the council’s written HMO standards.
- Area
- Caerphilly, Wales
- Postcodes
- CF46 and CF82
- Location
- 13 miles north of Cardiff
- Pricing region
- Wales
What do extensions for extra rooms in Nelson (Caerphilly) involve?
- Building control completion
- Ensuite drainage and extraction
- Foundations, structure and roof
- Kitchen or bedroom fit-out
- Fire separation and detection extended to the new space
Which rules apply in Nelson (Caerphilly)?
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 Nelson (Caerphilly) 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.
- Fitness for human habitation rules require mains-powered, interlinked smoke alarms on every storey and CO alarms where there is a gas, oil or solid-fuel appliance.
- Kitchen and bathroom ratios are set in each council’s HMO standards.
How much do extensions for extra rooms cost in Nelson (Caerphilly)?
| 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 Nelson (Caerphilly) follows a site visit.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Nelson (Caerphilly), tell us at the first call so the programme is built around it.
When do Nelson (Caerphilly) landlords need it?
Landlords in Nelson (Caerphilly) most often ask us for this when:
- Adding a ground-floor room
- Moving to more sharers with consent
Questions about extensions for extra rooms in Nelson (Caerphilly)
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Do you cover all of Nelson (Caerphilly)?
Yes. We work across Nelson (Caerphilly) and the CF46 and CF82 postcode areas, plus the rest of Caerphilly. Nearby places we also cover include Treharris, Gelligaer, Bargoed.
Where do I check the HMO rules for an address in Nelson (Caerphilly)?
With the local council for the address. Welsh councils set their own HMO standards and may run additional licensing. In Wales, changing a house to a C4 HMO always needs planning permission, so check planning first.
How much do extensions for extra rooms cost in Nelson (Caerphilly)?
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 Nelson (Caerphilly)
- Treharris · 1 mi
- Gelligaer · 1 mi
- Bargoed · 3 mi
- Blackwood · 3 mi
- Pontypridd · 4 mi
- Caerphilly · 6 mi
- All of Caerphilly
Other HMO services in Nelson (Caerphilly)
- Loft conversions for extra rooms in Nelson (Caerphilly)
- Communal kitchen refits in Nelson (Caerphilly)
- Layout changes and room reconfiguration in Nelson (Caerphilly)
- Large HMO conversions (7+ sharers) in Nelson (Caerphilly)
- Ensuite installation in Nelson (Caerphilly)
- House to HMO conversion in Nelson (Caerphilly)
- Escape routes, emergency lighting and fire stopping in Nelson (Caerphilly)
- Void and between-tenancy refurbs in Nelson (Caerphilly)