An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Merthyr Tydfil (CF47 and CF48) usually come to us with a council letter, a fire risk assessment or a house they have just bought. We price from whichever you have.
- Area
- Merthyr Tydfil, Wales
- Postcodes
- CF47 and CF48
- Location
- 20 miles north-west of Cardiff
- Pricing region
- Wales
What do extensions for extra rooms in Merthyr Tydfil involve?
- Fire separation and detection extended to the new space
- Ensuite drainage and extraction
- Heating, insulation and glazing
- Kitchen or bedroom fit-out
- Planning route check and drawings
Which rules apply in Merthyr Tydfil?
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 Merthyr Tydfil 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 Merthyr Tydfil?
| 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 Merthyr Tydfil follows a site visit.
How long does it take?
Typical time on site: 8–14 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
When do Merthyr Tydfil landlords need it?
We usually get the call when:
- Moving to more sharers with consent
- Adding a ground-floor room
Questions about extensions for extra rooms in Merthyr Tydfil
Do you handle building control?
Yes, from application to completion certificate.
Which postcodes in Merthyr Tydfil do you work in?
All of them, including CF47 and CF48, and the surrounding parts of Merthyr Tydfil.
Where do I check the HMO rules for an address in Merthyr Tydfil?
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 Merthyr Tydfil?
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 Merthyr Tydfil
- Aberdare · 4 mi
- Tredegar · 6 mi
- Treharris · 7 mi
- Rhondda · 7 mi
- Ebbw Vale · 8 mi
- Bargoed · 8 mi
- All of Merthyr Tydfil
Other HMO services in Merthyr Tydfil
- Loft conversions for extra rooms in Merthyr Tydfil
- Communal kitchen refits in Merthyr Tydfil
- Layout changes and room reconfiguration in Merthyr Tydfil
- Large HMO conversions (7+ sharers) in Merthyr Tydfil
- Ensuite installation in Merthyr Tydfil
- House to HMO conversion in Merthyr Tydfil
- Small HMO conversions (3–6 sharers) in Merthyr Tydfil
- Commercial and above-shop to HMO in Merthyr Tydfil