An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Chiswick (W4) usually come to us with a council letter, a fire risk assessment or a house they have just bought. We price from whichever you have.
- Area
- Greater London, England
- Postcodes
- W4
- Location
- 6 miles west of London
- Pricing region
- London
What do extensions for extra rooms in Chiswick involve?
- Building control completion
- Party wall coordination where needed
- Fire separation and detection extended to the new space
- Ensuite drainage and extraction
- Planning route check and drawings
Which rules apply in Chiswick?
Here is what usually applies to a Chiswick job of this kind. It is general information rather than legal advice, and the council’s written HMO standards have the final detail.
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- 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 Chiswick?
| 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 Chiswick 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?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Chiswick, tell us at the first call so the programme is built around it.
When do Chiswick landlords need it?
Typical reasons for this work in Chiswick:
- Adding a ground-floor room
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Chiswick
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.
How far do you travel from Chiswick?
We cover the whole of Greater London and work UK-wide. For Chiswick the nearest towns on our list are Acton (1 miles), Barnes (1 miles), Shepherds Bush (2 miles).
Does a shared house in Chiswick 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 Chiswick?
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 Chiswick
- Acton · 1 mi
- Barnes · 1 mi
- Shepherds Bush · 2 mi
- Notting Hill · 3 mi
- Fulham · 3 mi
- Putney · 3 mi
- All of Greater London
Other HMO services in Chiswick
- Loft conversions for extra rooms in Chiswick
- Communal kitchen refits in Chiswick
- Layout changes and room reconfiguration in Chiswick
- Large HMO conversions (7+ sharers) in Chiswick
- Ensuite installation in Chiswick
- House to HMO conversion in Chiswick
- Student HMO refurbishment in Chiswick
- Shared bathroom and shower room refits in Chiswick