An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Brighton is 47 miles south of London. We price extensions for extra rooms there against England’s HMO rules and the council’s written HMO standards, so work is planned to the standard an inspection looks for. With students as well as working sharers renting in Brighton, we plan bigger jobs for the gap between academic-year tenancies where we can.
- Area
- East Sussex, England
- Postcodes
- BN1, BN2 and BN3
- Location
- 47 miles south of London
- Council
- Brighton & Hove City Council
- Pricing region
- South East
What do extensions for extra rooms in Brighton involve?
- Party wall coordination where needed
- Foundations, structure and roof
- Fire separation and detection extended to the new space
- Kitchen or bedroom fit-out
- Ensuite drainage and extraction
Which rules apply in Brighton?
The rules below are the England-wide position for this kind of work. Councils add their own standards and schemes on top, so we always check the address in Brighton before we price.
- 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.
- The Fire Safety Order 2005 applies to the common parts of HMOs, enforced by the fire and rescue authority.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
Brighton & Hove City Council: local HMO schemes
| Article 4 (HMO) | In force across the council area City-wide C3-C4 Article 4 Direction confirmed Jan 2020 and in force June 2020 (replaced the 2013 five-ward direction). |
|---|---|
| Additional licensing | In force across the council area Additional licensing across all 23 wards 1 Jul 2024-30 Jun 2029. |
| Selective licensing | In force in part of the council area Kemptown, Moulsecoomb & Bevendean, Queen's Park, Whitehawk & Marina 2 Sep 2024-1 Sep 2029. Central Hove & Regency designation (made 6 Jul 2026, due 20 Oct 2026) is paused pending a legal challenge. |
Schemes change. Check the council’s current pages for the exact address in Brighton before you buy or start work. Source: Brighton & Hove City Council HMO licensing page, checked 2026-10-31.
How much do extensions for extra rooms cost in Brighton?
| 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 |
These are typical ranges including VAT, adjusted for South East, where costs run above the UK average. The fixed price for a house in Brighton follows a site visit.
How long does it take?
Typical time on site: 8–14 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
For student houses in Brighton, booking by spring is the safest way to make the summer gap.
When do Brighton landlords need it?
Landlords in Brighton most often ask us for this when:
- A kitchen too small for the number of sharers
- Adding a ground-floor room
Questions about extensions for extra rooms in Brighton
Do you handle building control?
Yes, from application to completion certificate.
Which postcodes in Brighton do you work in?
All of them, including BN1, BN2 and BN3, and the surrounding parts of East Sussex.
Which council covers HMOs in Brighton?
Brighton is covered by Brighton & Hove City Council. We read the council’s written HMO standards before pricing, and you should check the licence position for the exact address.
How much do extensions for extra rooms cost in Brighton?
Our guide ranges for South East are in the table on this page, and the guide-price tool gives a figure for your house. A fixed written quote follows a free site visit.
Extensions for extra rooms near Brighton
- Hove · 1 mi
- Portslade · 3 mi
- Rottingdean · 4 mi
- Burgess Hill · 9 mi
- Worthing · 10 mi
- Seaford · 11 mi
- All of East Sussex
Other HMO services in Brighton
- Loft conversions for extra rooms in Brighton
- Communal kitchen refits in Brighton
- Layout changes and room reconfiguration in Brighton
- Large HMO conversions (7+ sharers) in Brighton
- Ensuite installation in Brighton
- House to HMO conversion in Brighton
- Rewires and EICR remedials in Brighton
- Shared bathroom and shower room refits in Brighton