An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. For a house in East Grinstead we start with a measured survey, check the council’s written HMO standards for the number of sharers, and then price each item separately.
- Area
- West Sussex, England
- Postcodes
- RH19
- Location
- 21 miles north of Brighton
- Pricing region
- South East
What do extensions for extra rooms in East Grinstead involve?
- Planning route check and drawings
- Ensuite drainage and extraction
- Fire separation and detection extended to the new space
- Kitchen or bedroom fit-out
- Heating, insulation and glazing
Which rules apply in East Grinstead?
Extensions for extra rooms in East Grinstead must satisfy national law for England, the council’s written HMO standards and, where walls, drainage or fire separation change, the building rules. In short:
- 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.
- National rules ask for an adequate number of bathrooms, WCs and basins and suitably located kitchens; numeric ratios are set by each council.
How much do extensions for extra rooms cost in East Grinstead?
| 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 |
Prices in East Grinstead are shown with our regional adjustment for South East (above the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in East Grinstead, tell us at the first call so the programme is built around it.
When do East Grinstead landlords need it?
Landlords in East Grinstead 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 East Grinstead
Do you handle building control?
Yes, from application to completion certificate.
Which postcodes in East Grinstead do you work in?
All of them, including RH19, and the surrounding parts of West Sussex.
Where do I check the HMO rules for an address in East Grinstead?
With the local council for the address. 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 Grinstead?
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 East Grinstead
- Horley · 7 mi
- Crawley · 8 mi
- Crowborough · 9 mi
- Haywards Heath · 10 mi
- Redhill · 11 mi
- Caterham · 11 mi
- All of West Sussex
Other HMO services in East Grinstead
- Loft conversions for extra rooms in East Grinstead
- Communal kitchen refits in East Grinstead
- Layout changes and room reconfiguration in East Grinstead
- Large HMO conversions (7+ sharers) in East Grinstead
- Ensuite installation in East Grinstead
- House to HMO conversion in East Grinstead
- Small HMO conversions (3–6 sharers) in East Grinstead
- Licence condition and schedule-of-works in East Grinstead