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 Hanworth 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
- TW12 and TW13
- Location
- 12 miles south-west of London
- Pricing region
- London
What do extensions for extra rooms in Hanworth involve?
- Planning route check and drawings
- Ensuite drainage and extraction
- Heating, insulation and glazing
- Foundations, structure and roof
- Building control completion
Which rules apply in Hanworth?
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 Hanworth 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.
- 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.
- Council standards often step up at 5 and 6 sharers, for example a separate WC at 5 and a second bathroom from 6.
How much do extensions for extra rooms cost in Hanworth?
| 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 |
Prices in Hanworth are shown with our regional adjustment for London (above the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
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.
When do Hanworth landlords need it?
Landlords in Hanworth most often ask us for this when:
- Moving to more sharers with consent
- Adding a ground-floor room
Questions about extensions for extra rooms in Hanworth
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 Hanworth?
Yes. We work across Hanworth and the TW12 and TW13 postcode areas, plus the rest of Greater London. Nearby places we also cover include Hampton, Feltham, Sunbury-on-Thames.
Where do I check the HMO rules for an address in Hanworth?
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 Hanworth?
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 Hanworth
- Hampton · 2 mi
- Feltham · 2 mi
- Sunbury-on-Thames · 3 mi
- Hounslow · 3 mi
- Ashford (Surrey) · 3 mi
- Isleworth · 3 mi
- All of Greater London
Other HMO services in Hanworth
- Loft conversions for extra rooms in Hanworth
- Communal kitchen refits in Hanworth
- Layout changes and room reconfiguration in Hanworth
- Large HMO conversions (7+ sharers) in Hanworth
- Ensuite installation in Hanworth
- House to HMO conversion in Hanworth
- Fire doors in Hanworth
- Professional and co-living HMO refurbs in Hanworth