An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In Hounslow, a town of around 65,000 people in Greater London, the work is planned around the HMO rules for England and the council’s written HMO standards.
- Area
- Greater London, England
- Postcodes
- TW3, TW4 and TW6
- Location
- 10 miles west of London
- Pricing region
- London
What do extensions for extra rooms in Hounslow involve?
- Ensuite drainage and extraction
- Fire separation and detection extended to the new space
- Building control completion
- Party wall coordination where needed
- Heating, insulation and glazing
Which rules apply in Hounslow?
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 Hounslow 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.
- Fire precautions follow a risk assessment; the LACORS Housing – Fire Safety guide (2008) is guidance, not law, but many councils base their standards on it.
- 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 Hounslow?
| 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 Hounslow 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.
When do Hounslow landlords need it?
We usually get the call when:
- Adding a ground-floor room
- Moving to more sharers with consent
Questions about extensions for extra rooms in Hounslow
Is a kitchen extension worth it?
Often, when the existing kitchen limits how many people the council will allow. A bigger kitchen can unlock an extra room.
Which postcodes in Hounslow do you work in?
All of them, including TW3, TW4 and TW6, and the surrounding parts of Greater London.
Does a shared house in Hounslow need an HMO licence?
In England, a mandatory licence is needed for 5 or more people from 2 or more households. Smaller HMOs can need a licence where the council runs additional licensing, which is common in towns with many shared houses. Check the council’s website for the address.
How much do extensions for extra rooms cost in Hounslow?
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 Hounslow
- Isleworth · 1 mi
- Heston · 1 mi
- Richmond · 2 mi
- Hanworth · 3 mi
- Feltham · 3 mi
- Southall · 3 mi
- All of Greater London
Other HMO services in Hounslow
- Loft conversions for extra rooms in Hounslow
- Communal kitchen refits in Hounslow
- Layout changes and room reconfiguration in Hounslow
- Large HMO conversions (7+ sharers) in Hounslow
- Ensuite installation in Hounslow
- House to HMO conversion in Hounslow
- Fire doors in Hounslow
- Escape routes, emergency lighting and fire stopping in Hounslow