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 City of Westminster 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
- Greater London, England
- Postcodes
- SW1 and W2
- Location
- 1 miles south-west of London
- Pricing region
- London
What do extensions for extra rooms in City of Westminster involve?
- Kitchen or bedroom fit-out
- Planning route check and drawings
- Party wall coordination where needed
- Foundations, structure and roof
- Heating, insulation and glazing
Which rules apply in City of Westminster?
Here is what usually applies to a City of Westminster 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.
- 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.
How much do extensions for extra rooms cost in City of Westminster?
| 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 City of Westminster follows a site visit.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in City of Westminster, tell us at the first call so the programme is built around it.
When do City of Westminster landlords need it?
We usually get the call when:
- A kitchen too small for the number of sharers
- Adding a ground-floor room
Questions about extensions for extra rooms in City of Westminster
Can I extend an HMO under permitted development?
Some extensions to houses are permitted development, but rules differ for HMOs and by nation and council. We check the address before design.
Which postcodes in City of Westminster do you work in?
All of them, including SW1 and W2, and the surrounding parts of Greater London.
Where do I check the HMO rules for an address in City of Westminster?
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 City of Westminster?
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 City of Westminster
- Pimlico · 1 mi
- London · 1 mi
- Chelsea · 2 mi
- Battersea · 2 mi
- Brixton · 3 mi
- Fulham · 3 mi
- All of Greater London
Other HMO services in City of Westminster
- Loft conversions for extra rooms in City of Westminster
- Communal kitchen refits in City of Westminster
- Layout changes and room reconfiguration in City of Westminster
- Large HMO conversions (7+ sharers) in City of Westminster
- Ensuite installation in City of Westminster
- House to HMO conversion in City of Westminster
- Commercial and above-shop to HMO in City of Westminster
- Sound insulation in City of Westminster