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 Greenwich we start with a measured survey, check the council’s written HMO standards for the number of sharers, and then price each item separately. Greenwich has a university population, so many shared houses are let to students on yearly tenancies, and summer is the main window for works.
- Area
- Greater London, England
- Postcodes
- SE8, SE10 and SE14
- Location
- 5 miles south-east of London
- Pricing region
- London
What do extensions for extra rooms in Greenwich involve?
- Building control completion
- Planning route check and drawings
- Party wall coordination where needed
- Fire separation and detection extended to the new space
- Ensuite drainage and extraction
Which rules apply in Greenwich?
Here is what usually applies to a Greenwich job of this kind. It is general information rather than legal advice, and the council’s written HMO standards have the final detail.
- 3–6 unrelated sharers is use class C4; changing from a family house is usually permitted development unless an Article 4 direction applies.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
- 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 Greenwich?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £44,800 – £76,800 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £2,300 – £5,100 | m² |
These are typical ranges including VAT, adjusted for London, where costs run above the UK average. The fixed price for a house in Greenwich follows a site visit.
How long does it take?
Allow 8–14 weeks on site for a typical job. Drawings, approvals and long-lead items such as kitchens or fire door sets are booked before we start.
For student houses in Greenwich, booking by spring is the safest way to make the summer gap.
When do Greenwich landlords need it?
We usually get the call when:
- A kitchen too small for the number of sharers
- Moving to more sharers with consent
Questions about extensions for extra rooms in Greenwich
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 cover all of Greenwich?
Yes. We work across Greenwich and the SE8, SE10 and SE14 postcode areas, plus the rest of Greater London. Nearby places we also cover include Blackheath, Canary Wharf, Catford.
Where do I check the HMO rules for an address in Greenwich?
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 Greenwich?
Our guide ranges for London 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 Greenwich
- Blackheath · 1 mi
- Canary Wharf · 2 mi
- Catford · 2 mi
- Peckham · 3 mi
- Canning Town · 3 mi
- Eltham · 3 mi
- All of Greater London
Other HMO services in Greenwich
- Loft conversions for extra rooms in Greenwich
- Communal kitchen refits in Greenwich
- Layout changes and room reconfiguration in Greenwich
- Large HMO conversions (7+ sharers) in Greenwich
- Ensuite installation in Greenwich
- House to HMO conversion in Greenwich
- Fire alarm and detection systems in Greenwich
- Fire doors in Greenwich