- Nation
- England
- Pricing region
- South East
- Postcode areas
- RH, PO, BN, GU
- Main towns
- Crawley, Worthing, Bognor Regis, Littlehampton, Horsham
What do loft conversions for extra rooms in West Sussex involve?
- Feasibility and head-height check
- New stair within the protected route
- Structural design and steelwork
- Planning or permitted development check
- Fire doors and extended alarm system
- Ensuite where space allows
Which rules apply in West Sussex?
- 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.
- Smoke alarms on every storey with living accommodation and CO alarms by fixed combustion appliances (other than gas cookers) are required by law.
- Floor area under a ceiling lower than 1.5 m does not count towards the room size, and many councils set larger sizes.
- Under the Renters’ Rights Act, civil penalties reach £40,000 for offences such as running an unlicensed HMO.
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 loft conversions for extra rooms cost in West Sussex?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £44,800 – £67,200 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £25,200 – £33,600 | project |
Typical time on site: 6–10 weeks. For a figure for your house, try the guide-price tool.
Loft conversions for extra rooms by town in West Sussex
Questions about loft conversions for extra rooms in West Sussex
How much head height do I need?
As a rule of thumb, about 2.2 metres at the highest point of the existing roof space before any work. Less can work with a dormer or lowered ceilings.
Will the loft room count for licensing?
Only the floor area with at least 1.5 metres of headroom counts towards the room size in England.
Do you carry out loft conversions for extra rooms across West Sussex?
Yes, across the whole of West Sussex, including Crawley, Worthing, Bognor Regis.
Who licenses HMOs in West Sussex?
HMOs in West 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 West Sussex
- Extensions for extra rooms in West Sussex
- Large HMO conversions (7+ sharers) in West Sussex
- Escape routes, emergency lighting and fire stopping in West Sussex
- Ensuite installation in West Sussex
- Layout changes and room reconfiguration in West Sussex
- Fire alarm and detection systems in West Sussex
- Damp, mould and HHSRS repairs in West Sussex
- Void and between-tenancy refurbs in West Sussex