An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In Carshalton, a town of around 45,000 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
- CR4, SM5 and SM6
- Location
- 10 miles south of London
- Pricing region
- London
What do extensions for extra rooms in Carshalton involve?
- Kitchen or bedroom fit-out
- Party wall coordination where needed
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Foundations, structure and roof
Which rules apply in Carshalton?
Here is what usually applies to a Carshalton 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.
- 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 Carshalton?
| 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 Carshalton can move the figure either way, which is why we quote after seeing the house.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Carshalton, tell us at the first call so the programme is built around it.
When do Carshalton landlords need it?
We usually get the call when:
- Moving to more sharers with consent
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Carshalton
Do you handle building control?
Yes, from application to completion certificate.
Which postcodes in Carshalton do you work in?
All of them, including CR4, SM5 and SM6, and the surrounding parts of Greater London.
Does a shared house in Carshalton 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 Carshalton?
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 Carshalton
- Wallington · 1 mi
- Sutton · 2 mi
- Mitcham · 2 mi
- Morden · 2 mi
- Croydon · 3 mi
- South Croydon · 3 mi
- All of Greater London
Other HMO services in Carshalton
- Loft conversions for extra rooms in Carshalton
- Communal kitchen refits in Carshalton
- Layout changes and room reconfiguration in Carshalton
- Large HMO conversions (7+ sharers) in Carshalton
- Ensuite installation in Carshalton
- House to HMO conversion in Carshalton
- Commercial and above-shop to HMO in Carshalton
- Sound insulation in Carshalton