An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Landlords in Archway (N19) 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
- N19
- Location
- 4 miles north of London
- Pricing region
- London
What do extensions for extra rooms in Archway involve?
- Fire separation and detection extended to the new space
- Heating, insulation and glazing
- Building control completion
- Ensuite drainage and extraction
- Foundations, structure and roof
Which rules apply in Archway?
Extensions for extra rooms in Archway must satisfy national law for England, the council’s written HMO standards and, where walls, drainage or fire separation change, the building rules. In short:
- 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.
- 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 Archway?
| 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 Archway follows a site visit.
How long does it take?
Most jobs of this kind take 8–14 weeks. If a council deadline applies in Archway, tell us at the first call so the programme is built around it.
When do Archway landlords need it?
Typical reasons for this work in Archway:
- Adding a ground-floor room
- A kitchen too small for the number of sharers
Questions about extensions for extra rooms in Archway
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.
Which postcodes in Archway do you work in?
All of them, including N19, and the surrounding parts of Greater London.
Where do I check the HMO rules for an address in Archway?
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 Archway?
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 Archway
- Holloway · 1 mi
- Muswell Hill · 2 mi
- Chalk Farm · 2 mi
- Camden Town · 2 mi
- Highbury · 2 mi
- Wood Green · 2 mi
- All of Greater London
Other HMO services in Archway
- Loft conversions for extra rooms in Archway
- Communal kitchen refits in Archway
- Layout changes and room reconfiguration in Archway
- Large HMO conversions (7+ sharers) in Archway
- Ensuite installation in Archway
- House to HMO conversion in Archway
- Escape routes, emergency lighting and fire stopping in Archway
- Void and between-tenancy refurbs in Archway