In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Across Flintshire, the work is planned around Wales’s HMO rules and the standards the local council publishes.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CH, LL
- Main towns
- Buckley, Deeside, Flint, Hawarden
What do extensions for extra rooms in Flintshire involve?
- Foundations, structure and roof
- Kitchen or bedroom fit-out
- Party wall coordination where needed
- Fire separation and detection extended to the new space
- Building control completion
- Ensuite drainage and extraction
Which rules apply in Flintshire?
- 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.
- Kitchen and bathroom ratios are set in each council’s HMO standards.
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 Flintshire?
| 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 |
Typical time on site: 8–14 weeks. For a figure for your house, try the guide-price tool.
Extensions for extra rooms by town in Flintshire
Questions about extensions for extra rooms in Flintshire
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.
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 carry out extensions for extra rooms across Flintshire?
Yes, across the whole of Flintshire, including Buckley, Deeside, Flint.
Who licenses HMOs in Flintshire?
Flintshire council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Flintshire
- Loft conversions for extra rooms in Flintshire
- Communal kitchen refits in Flintshire
- Layout changes and room reconfiguration in Flintshire
- Large HMO conversions (7+ sharers) in Flintshire
- Ensuite installation in Flintshire
- House to HMO conversion in Flintshire
- Shared bathroom and shower room refits in Flintshire
- Fire alarm and detection systems in Flintshire