An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. For a house in Llantrisant we start with a measured survey, check the council’s written HMO standards for the number of sharers, and then price each item separately.
- Area
- Rhondda Cynon Taf, Wales
- Postcodes
- CF38 and CF72
- Location
- 9 miles north-west of Cardiff
- Pricing region
- Wales
What do extensions for extra rooms in Llantrisant involve?
- Foundations, structure and roof
- Building control completion
- Planning route check and drawings
- Fire separation and detection extended to the new space
- Kitchen or bedroom fit-out
Which rules apply in Llantrisant?
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 Llantrisant 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 Llantrisant?
| 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 |
Prices in Llantrisant are shown with our regional adjustment for Wales (below the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
How long does it take?
Allow 8–14 weeks on site for a typical job. Drawings, approvals and long-lead items such as kitchens or fire door sets are booked before we start.
When do Llantrisant landlords need it?
Typical reasons for this work in Llantrisant:
- Moving to more sharers with consent
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Llantrisant
Do you handle building control?
Yes, from application to completion certificate.
Do you cover all of Llantrisant?
Yes. We work across Llantrisant and the CF38 and CF72 postcode areas, plus the rest of Rhondda Cynon Taf. Nearby places we also cover include Pontypridd, Tonypandy, Whitchurch.
Where do I check the HMO rules for an address in Llantrisant?
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 Llantrisant?
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 Llantrisant
- Pontypridd · 4 mi
- Tonypandy · 7 mi
- Whitchurch · 7 mi
- Caerphilly · 7 mi
- Coity · 8 mi
- Nelson (Caerphilly) · 9 mi
- All of Rhondda Cynon Taf
Other HMO services in Llantrisant
- Loft conversions for extra rooms in Llantrisant
- Communal kitchen refits in Llantrisant
- Layout changes and room reconfiguration in Llantrisant
- Large HMO conversions (7+ sharers) in Llantrisant
- Ensuite installation in Llantrisant
- House to HMO conversion in Llantrisant
- Licence condition and schedule-of-works in Llantrisant
- Sound insulation in Llantrisant