An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Acton (W3) 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
- W3
- Location
- 6 miles west of London
- Council
- London Borough of Ealing
- Pricing region
- London
What do extensions for extra rooms in Acton involve?
- Foundations, structure and roof
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Ensuite drainage and extraction
- Kitchen or bedroom fit-out
Which rules apply in Acton?
Here is what usually applies to a Acton 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.
- 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.
London Borough of Ealing: local HMO schemes
| Article 4 (HMO) | In force across the council area Immediate direction for Perivale from 30 Oct 2024 and non-immediate direction for the rest of the borough from 2025. |
|---|---|
| Additional licensing | In force across the council area Borough-wide additional licensing 1 Apr 2022-31 Mar 2027; renewal consulted 15 Jul-24 Sep 2026. |
| Selective licensing | In force in part of the council area Two designations covering most wards: 1 Apr 2022-31 Mar 2027 (e.g. Southall, East/North Acton) and 3 Jan 2023-2 Jan 2028 (e.g. Greenford, Northolt, Perivale, Ealing Common). |
Schemes change. Check the council’s current pages for the exact address in Acton before you buy or start work. Source: London Borough of Ealing HMO licensing page, checked 2026-10-31.
How much do extensions for extra rooms cost in Acton?
| 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 |
Use these as a starting point for budgeting. Access, condition and the council’s requirements in Acton can move the figure either way, which is why we quote after seeing the house.
How long does it take?
Typical time on site: 8–14 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
When do Acton landlords need it?
Typical reasons for this work in Acton:
- A kitchen too small for the number of sharers
- Adding a ground-floor room
Questions about extensions for extra rooms in Acton
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Which postcodes in Acton do you work in?
All of them, including W3, and the surrounding parts of Greater London.
Which council covers HMOs in Acton?
Acton is covered by London Borough of Ealing. We read the council’s written HMO standards before pricing, and you should check the licence position for the exact address.
How much do extensions for extra rooms cost in Acton?
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 Acton
- Chiswick · 1 mi
- Shepherds Bush · 2 mi
- Willesden · 2 mi
- Barnes · 3 mi
- Notting Hill · 3 mi
- Wembley · 3 mi
- All of Greater London
Other HMO services in Acton
- Loft conversions for extra rooms in Acton
- Communal kitchen refits in Acton
- Layout changes and room reconfiguration in Acton
- Large HMO conversions (7+ sharers) in Acton
- Ensuite installation in Acton
- House to HMO conversion in Acton
- Damp, mould and HHSRS repairs in Acton
- Professional and co-living HMO refurbs in Acton