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 Harrow 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
- HA1, HA2 and HA3
- Location
- 10 miles north-west of London
- Pricing region
- London
What do extensions for extra rooms in Harrow involve?
- Party wall coordination where needed
- Kitchen or bedroom fit-out
- Foundations, structure and roof
- Ensuite drainage and extraction
- Planning route check and drawings
Which rules apply in Harrow?
Here is what usually applies to a Harrow 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.
- 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 Harrow?
| 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 Harrow 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 Harrow, tell us at the first call so the programme is built around it.
When do Harrow 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 Harrow
Do you handle building control?
Yes, from application to completion certificate.
How far do you travel from Harrow?
We cover the whole of Greater London and work UK-wide. For Harrow the nearest towns on our list are Brent (2 miles), Wembley (2 miles), Northolt (3 miles).
Does a shared house in Harrow 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 Harrow?
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 Harrow
- Brent · 2 mi
- Wembley · 2 mi
- Northolt · 3 mi
- Greenford · 4 mi
- Ruislip · 4 mi
- Bushey · 5 mi
- All of Greater London
Other HMO services in Harrow
- Loft conversions for extra rooms in Harrow
- Communal kitchen refits in Harrow
- Layout changes and room reconfiguration in Harrow
- Large HMO conversions (7+ sharers) in Harrow
- Ensuite installation in Harrow
- House to HMO conversion in Harrow
- Small HMO conversions (3–6 sharers) in Harrow
- HMO fire safety upgrades in Harrow