An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. Catford is 6 miles south-east of London. We price extensions 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
- SE6 and SE23
- Location
- 6 miles south-east of London
- Council
- London Borough of Lewisham
- Pricing region
- London
What do extensions for extra rooms in Catford involve?
- Planning route check and drawings
- Ensuite drainage and extraction
- Fire separation and detection extended to the new space
- Party wall coordination where needed
- Heating, insulation and glazing
Which rules apply in Catford?
Here is what usually applies to a Catford 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.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
- The Fire Safety Order 2005 applies to the common parts of HMOs, enforced by the fire and rescue authority.
- National rules ask for an adequate number of bathrooms, WCs and basins and suitably located kitchens; numeric ratios are set by each council.
London Borough of Lewisham: local HMO schemes
| Article 4 (HMO) | In force across the council area Direction for southern wards from 2020, extended to the rest of the borough from 2024. |
|---|---|
| Additional licensing | In force across the council area Borough-wide additional licensing 5 Apr 2022-4 Apr 2027. |
| Selective licensing | In force in part of the council area Selective licensing in 18 of 19 wards (excludes Telegraph Hill and parts of Blackheath) from 1 Jul 2024 to 30 Jun 2029. |
Schemes change. Check the council’s current pages for the exact address in Catford before you buy or start work. Source: London Borough of Lewisham HMO licensing page, checked 2026-10-31.
How much do extensions for extra rooms cost in Catford?
| 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 Catford 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 Catford, tell us at the first call so the programme is built around it.
When do Catford landlords need it?
We usually get the call when:
- A kitchen too small for the number of sharers
- Moving to more sharers with consent
Questions about extensions for extra rooms in Catford
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 Catford do you work in?
All of them, including SE6 and SE23, and the surrounding parts of Greater London.
Which council covers HMOs in Catford?
Catford is covered by London Borough of Lewisham. We read the council’s written HMO standards before pricing, and you should check the licence position for the exact address.
How much do extensions for extra rooms cost in Catford?
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 Catford
- Blackheath · 2 mi
- Greenwich · 2 mi
- Beckenham · 3 mi
- Peckham · 3 mi
- Eltham · 3 mi
- Brixton · 4 mi
- All of Greater London
Other HMO services in Catford
- Loft conversions for extra rooms in Catford
- Communal kitchen refits in Catford
- Layout changes and room reconfiguration in Catford
- Large HMO conversions (7+ sharers) in Catford
- Ensuite installation in Catford
- House to HMO conversion in Catford
- Escape routes, emergency lighting and fire stopping in Catford
- Fire doors in Catford