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 Holloway 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
- N7
- Location
- 3 miles north of London
- Pricing region
- London
What do extensions for extra rooms in Holloway involve?
- Fire separation and detection extended to the new space
- Foundations, structure and roof
- Planning route check and drawings
- Kitchen or bedroom fit-out
- Ensuite drainage and extraction
Which rules apply in Holloway?
Extensions for extra rooms in Holloway 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:
- 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.
- 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 Holloway?
| 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 Holloway can move the figure either way, which is why we quote after seeing the house.
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 Holloway landlords need it?
Typical reasons for this work in Holloway:
- A kitchen too small for the number of sharers
- Moving to more sharers with consent
Questions about extensions for extra rooms in Holloway
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Do you cover all of Holloway?
Yes. We work across Holloway and the N7 postcode areas, plus the rest of Greater London. Nearby places we also cover include Highbury, Archway, Camden Town.
Where do I check the HMO rules for an address in Holloway?
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 Holloway?
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 Holloway
- Highbury · 1 mi
- Archway · 1 mi
- Camden Town · 1 mi
- Chalk Farm · 1 mi
- Islington · 1 mi
- Stamford Hill · 2 mi
- All of Greater London
Other HMO services in Holloway
- Loft conversions for extra rooms in Holloway
- Communal kitchen refits in Holloway
- Layout changes and room reconfiguration in Holloway
- Large HMO conversions (7+ sharers) in Holloway
- Ensuite installation in Holloway
- House to HMO conversion in Holloway
- Escape routes, emergency lighting and fire stopping in Holloway
- Shared bathroom and shower room refits in Holloway