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 Purley 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
- CR2 and CR8
- Location
- 12 miles south of London
- Pricing region
- London
What do extensions for extra rooms in Purley involve?
- Heating, insulation and glazing
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Kitchen or bedroom fit-out
- Ensuite drainage and extraction
Which rules apply in Purley?
Here is what usually applies to a Purley 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 Purley?
| 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 Purley 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 Purley landlords need it?
Landlords in Purley most often ask us for this when:
- A kitchen too small for the number of sharers
- Adding a ground-floor room
Questions about extensions for extra rooms in Purley
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 Purley do you work in?
All of them, including CR2 and CR8, and the surrounding parts of Greater London.
Where do I check the HMO rules for an address in Purley?
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 Purley?
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 Purley
- Coulsdon · 2 mi
- South Croydon · 2 mi
- Wallington · 3 mi
- Carshalton · 3 mi
- Croydon · 3 mi
- Sutton · 4 mi
- All of Greater London
Other HMO services in Purley
- Loft conversions for extra rooms in Purley
- Communal kitchen refits in Purley
- Layout changes and room reconfiguration in Purley
- Large HMO conversions (7+ sharers) in Purley
- Ensuite installation in Purley
- House to HMO conversion in Purley
- Void and between-tenancy refurbs in Purley
- Rewires and EICR remedials in Purley