An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Finchley (N3) 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
- N3
- Location
- 7 miles north-west of London
- Pricing region
- London
What do extensions for extra rooms in Finchley involve?
- Planning route check and drawings
- Building control completion
- Party wall coordination where needed
- Foundations, structure and roof
- Kitchen or bedroom fit-out
Which rules apply in Finchley?
Here is what usually applies to a Finchley job of this kind. It is general information rather than legal advice, and the council’s written HMO standards have the final detail.
- 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.
- 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 Finchley?
| 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 Finchley follows a site visit.
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 Finchley landlords need it?
We usually get the call when:
- Moving to more sharers with consent
- Adding a ground-floor room
Questions about extensions for extra rooms in Finchley
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
How far do you travel from Finchley?
We cover the whole of Greater London and work UK-wide. For Finchley the nearest towns on our list are Muswell Hill (2 miles), Cricklewood (3 miles), Kilburn (3 miles).
Where do I check the HMO rules for an address in Finchley?
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 Finchley?
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 Finchley
- Muswell Hill · 2 mi
- Cricklewood · 3 mi
- Kilburn · 3 mi
- Wood Green · 3 mi
- Barnet · 3 mi
- Archway · 4 mi
- All of Greater London
Other HMO services in Finchley
- Loft conversions for extra rooms in Finchley
- Communal kitchen refits in Finchley
- Layout changes and room reconfiguration in Finchley
- Large HMO conversions (7+ sharers) in Finchley
- Ensuite installation in Finchley
- House to HMO conversion in Finchley
- Fire doors in Finchley
- Rewires and EICR remedials in Finchley