In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Across Conwy, the work is planned around Wales’s HMO rules and the standards the local council publishes.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- LL
- Main towns
- Colwyn Bay, Llandudno
What do extensions for extra rooms in Conwy involve?
- Heating, insulation and glazing
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Ensuite drainage and extraction
- Kitchen or bedroom fit-out
- Foundations, structure and roof
Which rules apply in Conwy?
- 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.
- More than 6 sharers is a sui generis HMO and needs planning permission; councils such as Cardiff apply concentration limits.
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 Conwy?
| 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 Conwy
Questions about extensions for extra rooms in Conwy
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 handle building control?
Yes, from application to completion certificate.
Do you carry out extensions for extra rooms across Conwy?
Yes, across the whole of Conwy, including Colwyn Bay, Llandudno.
Who licenses HMOs in Conwy?
Conwy council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Conwy
- Loft conversions for extra rooms in Conwy
- Communal kitchen refits in Conwy
- Layout changes and room reconfiguration in Conwy
- Large HMO conversions (7+ sharers) in Conwy
- Ensuite installation in Conwy
- House to HMO conversion in Conwy
- Bedroom upgrades and room refits in Conwy
- Damp, mould and HHSRS repairs in Conwy