In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Across Somerset, the work is planned around England’s HMO rules and the standards the local council publishes.
- Nation
- England
- Pricing region
- South West
- Postcode areas
- TA, BA, BS, DT
- Main towns
- Mendip, Bath, Weston-super-Mare, Taunton, Yeovil
What do extensions for extra rooms in Somerset involve?
- Fire separation and detection extended to the new space
- Building control completion
- Planning route check and drawings
- Party wall coordination where needed
- Ensuite drainage and extraction
- Heating, insulation and glazing
Which rules apply in Somerset?
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Fire precautions follow a risk assessment; the LACORS Housing – Fire Safety guide (2008) is guidance, not law, but many councils base their standards on it.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
Councils in England can add additional licensing and Article 4 directions on top of the national rules. Check the council’s website for the exact address before you buy or start work.
How much do extensions for extra rooms cost in Somerset?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £36,400 – £62,400 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,850 – £4,150 | 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 Somerset
Questions about extensions for extra rooms in Somerset
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 Somerset?
Yes, across the whole of Somerset, including Mendip, Bath, Weston-super-Mare.
Who licenses HMOs in Somerset?
HMOs in Somerset are licensed by the local council for the address. Where an area has several councils, each runs its own licensing and planning policies.
Other HMO services in Somerset
- Loft conversions for extra rooms in Somerset
- Communal kitchen refits in Somerset
- Layout changes and room reconfiguration in Somerset
- Large HMO conversions (7+ sharers) in Somerset
- Ensuite installation in Somerset
- House to HMO conversion in Somerset
- Professional and co-living HMO refurbs in Somerset
- Damp, mould and HHSRS repairs in Somerset