In short: An HMO loft conversion adds one or two letting rooms, often with an ensuite, in the roof space. We carry this out across Caerphilly, priced against the HMO rules for Wales and the council’s own standards.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Caerphilly, Gelligaer, Blackwood, Bargoed, Nelson (Caerphilly)
What do loft conversions for extra rooms in Caerphilly involve?
- Building control sign-off
- New stair within the protected route
- Fire doors and extended alarm system
- Dormer or roof windows
- Ensuite where space allows
- Planning or permitted development check
Which rules apply in Caerphilly?
- More than 6 sharers is a sui generis HMO and needs planning permission; councils such as Cardiff apply concentration limits.
- 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.
- England’s national room sizes do not apply in Wales; councils set their own room standards.
- Mandatory licence for HMOs with 3 or more storeys and 5 or more people in 2 or more households; Wales did not adopt England’s 2018 change.
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 loft conversions for extra rooms cost in Caerphilly?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £37,600 – £56,400 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £21,150 – £28,200 | project |
Typical time on site: 6–10 weeks. For a figure for your house, try the guide-price tool.
Loft conversions for extra rooms by town in Caerphilly
Questions about loft conversions for extra rooms in Caerphilly
Does a loft room need a fire escape window?
In an HMO the main protection is usually a protected stair and fire doors. The building regulations and fire strategy decide the detail.
How much head height do I need?
As a rule of thumb, about 2.2 metres at the highest point of the existing roof space before any work. Less can work with a dormer or lowered ceilings.
Do you carry out loft conversions for extra rooms across Caerphilly?
Yes, across the whole of Caerphilly, including Caerphilly, Gelligaer, Blackwood.
Who licenses HMOs in Caerphilly?
Caerphilly council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Caerphilly
- Extensions for extra rooms in Caerphilly
- Large HMO conversions (7+ sharers) in Caerphilly
- Escape routes, emergency lighting and fire stopping in Caerphilly
- Ensuite installation in Caerphilly
- Layout changes and room reconfiguration in Caerphilly
- Fire alarm and detection systems in Caerphilly
- Licence condition and schedule-of-works in Caerphilly
- Student HMO refurbishment in Caerphilly