In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. We carry this out across Vale of Glamorgan, priced against the HMO rules for Wales and the council’s own standards.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Barry, Penarth, Llantwit Major
What do extensions for extra rooms in Vale of Glamorgan involve?
- Party wall coordination where needed
- Ensuite drainage and extraction
- Building control completion
- Foundations, structure and roof
- Fire separation and detection extended to the new space
- Heating, insulation and glazing
Which rules apply in Vale of Glamorgan?
- 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 Vale of Glamorgan?
| 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 Vale of Glamorgan
Questions about extensions for extra rooms in Vale of Glamorgan
Is a kitchen extension worth it?
Often, when the existing kitchen limits how many people the council will allow. A bigger kitchen can unlock an extra room.
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 Vale of Glamorgan?
Yes, across the whole of Vale of Glamorgan, including Barry, Penarth, Llantwit Major.
Who licenses HMOs in Vale of Glamorgan?
Vale of Glamorgan council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Vale of Glamorgan
- Loft conversions for extra rooms in Vale of Glamorgan
- Communal kitchen refits in Vale of Glamorgan
- Layout changes and room reconfiguration in Vale of Glamorgan
- Large HMO conversions (7+ sharers) in Vale of Glamorgan
- Ensuite installation in Vale of Glamorgan
- House to HMO conversion in Vale of Glamorgan
- Escape routes, emergency lighting and fire stopping in Vale of Glamorgan
- Rewires and EICR remedials in Vale of Glamorgan