In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In East Sussex we survey first, price each item separately and hand over the certificates and photos a council asks for.
- Nation
- England
- Pricing region
- South East
- Postcode areas
- TN, BN, RH
- Main towns
- Brighton, Eastbourne, Hastings, Hove, Bexhill-on-Sea
What do extensions for extra rooms in East Sussex involve?
- Ensuite drainage and extraction
- Party wall coordination where needed
- Kitchen or bedroom fit-out
- Building control completion
- Planning route check and drawings
- Heating, insulation and glazing
Which rules apply in East Sussex?
- 3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Smoke alarms on every storey with living accommodation and CO alarms by fixed combustion appliances (other than gas cookers) are required by law.
- National rules ask for an adequate number of bathrooms, WCs and basins and suitably located kitchens; numeric ratios are set by each council.
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
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 East Sussex?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £39,200 – £67,200 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £2,000 – £4,500 | 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 East Sussex
Questions about extensions for extra rooms in East Sussex
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
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.
Do you carry out extensions for extra rooms across East Sussex?
Yes, across the whole of East Sussex, including Brighton, Eastbourne, Hastings.
Who licenses HMOs in East Sussex?
HMOs in East Sussex 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 East Sussex
- Loft conversions for extra rooms in East Sussex
- Communal kitchen refits in East Sussex
- Layout changes and room reconfiguration in East Sussex
- Large HMO conversions (7+ sharers) in East Sussex
- Ensuite installation in East Sussex
- House to HMO conversion in East Sussex
- Damp, mould and HHSRS repairs in East Sussex
- Licence condition and schedule-of-works in East Sussex