An HMO loft conversion adds one or two letting rooms, often with an ensuite, in the roof space. London is in England. We price loft conversions for extra rooms there against England’s HMO rules and the council’s written HMO standards, so work is planned to the standard an inspection looks for.
- Area
- Greater London, England
- Postcodes
- EC1A, EC1M, EC1N and EC1R
- Pricing region
- London
What do loft conversions for extra rooms in London involve?
- Structural design and steelwork
- Dormer or roof windows
- Ensuite where space allows
- New stair within the protected route
- Building control sign-off
Which rules apply in London?
Loft conversions for extra rooms in London 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.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
- 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.
- Licensed HMOs must meet national minimum bedroom sizes: 6.51 m² for one person aged 10 or over, 10.22 m² for two, and 4.64 m² for a child under 10.
How much do loft conversions for extra rooms cost in London?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £51,200 – £76,800 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £28,800 – £38,400 | project |
Prices in London are shown with our regional adjustment for London (above the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
How long does it take?
Typical time on site: 6–10 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
When do London landlords need it?
Landlords in London most often ask us for this when:
- A house with usable roof space
- Adding rooms to make an HMO work financially
Questions about loft conversions for extra rooms in London
Will the loft room count for licensing?
Only the floor area with at least 1.5 metres of headroom counts towards the room size in England.
How far do you travel from London?
We cover the whole of Greater London and work UK-wide. For London the nearest towns on our list are City of Westminster (1 miles), Pimlico (1 miles), Islington (2 miles).
Where do I check the HMO rules for an address in London?
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 loft conversions for extra rooms cost in London?
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.
Loft conversions for extra rooms near London
- City of Westminster · 1 mi
- Pimlico · 1 mi
- Islington · 2 mi
- Camden Town · 2 mi
- Chelsea · 2 mi
- Chalk Farm · 3 mi
- All of Greater London
Other HMO services in London
- Extensions for extra rooms in London
- Large HMO conversions (7+ sharers) in London
- Escape routes, emergency lighting and fire stopping in London
- Ensuite installation in London
- Layout changes and room reconfiguration in London
- Fire alarm and detection systems in London
- Professional and co-living HMO refurbs in London
- Communal kitchen refits in London