HMO Conversions Carshalton

An HMO conversion in Carshalton now starts with planning, not the builder. Sutton's Article 4 Direction removing the permitted change from a family house to a house in multiple occupation covers the whole borough and came into force on 22 February 2025. Licensing follows, because Sutton's Additional Licensing Scheme applies borough-wide to HMOs below the mandatory threshold. We build to the planning consent and Sutton's HMO standards: room sizes, kitchens and bathrooms per occupant, and fire safety to LACORS guidance.

In Carshalton, a light HMO conversion for four to six tenants typically costs £40,000 to £75,000 in construction, or £90,000 to £150,000 with an en-suite to every bedroom (indicative London ranges, Mayfair Studio and LetCompliance, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Carshalton: we build the fire doors, detection, bathrooms and kitchens to the council's HMO standards, the landlord applies for the licence, and a registered electrician certifies the electrics.

HMOs in Carshalton after Sutton's borough-wide Article 4

Turning a family house in Carshalton into a small shared house, an HMO, now needs planning permission. Sutton made an Article 4 Direction on 22 February 2024, confirmed it on 26 November 2024, and it came into force across the whole borough on 22 February 2025. It removes the permitted change from a family house to a small HMO. Policy 10 also treats more than 20% of properties within 100 metres either side of a site being HMOs as a harmful concentration for new large HMOs.

The size of the HMO sets the route. The London Plan glossary puts HMOs for three to six people in Use Class C4 and larger ones in Sui Generis, which needs permission anywhere. Class L never allowed one house to become two or more separate HMOs. London Plan Policy H9 asks boroughs to value HMOs of a reasonable standard, but in Carshalton the application is still judged locally. We price from the scheme your designer submits, and hold the build until the consent is in hand.

Housing in Carshalton

By the valuation list's count, Carshalton holds about 9,910 homes, 66% houses and 34% flats; by age, 18% were built before 1919, 44% between the wars and 38% since 1945.

HMO licensing for a Carshalton shared house

Almost every HMO in Carshalton now needs a licence, whatever its size. A large HMO, rented to 5 or more people forming more than 1 household, falls under mandatory licensing. Sutton's Additional Licensing Scheme applies to the whole borough, so an HMO below the 5-person mandatory licensing threshold now needs a licence too. Sutton issues licences for up to five years and recommends renewal at least 60 days before expiry. The landlord makes the application; we build to its conditions.

Mandatory licensing does not reach a flat in a purpose-built block of three or more self-contained flats; where such a flat is shared, it is the council's additional scheme, if any, that applies.

Two edge cases are worth knowing before you plan the layout. Sutton says a resident landlord may have up to 2 lodgers before the property is legally classed as an HMO, so a lodger arrangement in a Carshalton house is not automatically a licensing case. At the other end, renting out an unlicensed HMO can lead to an unlimited fine, and Sutton charges a penalty fee where it discovers an HMO with no application made. Line up the licence before the first tenant arrives.

Sutton HMO room sizes and shared facilities in Carshalton

Sutton's HMO standards set the room sizes you must build to in Carshalton, and they depend on the shared space. A bedroom needs at least 10 square metres for one occupant and 15 for two where there is no cooking in the room. Those fall to 6.51 and 10.22 square metres only where a communal lounge or combined kitchen with dining area is provided. Nationally, no room under 4.64 square metres may be used for sleeping, and no more than two people, living as a couple, may sleep in one room here.

Heights and amenities come next. Every room needs a floor to ceiling height of at least 2.3m, except existing attic rooms. A shared kitchen should serve no more than five people, and every occupant needs a shared bathroom within one floor of their letting. In a Carshalton semi, that often means a second bathroom on the first floor and a larger kitchen diner at the back, and the designer checks the numbers room by room before the layout is fixed.

Fire safety, sound and energy in a Carshalton HMO

Fire safety is the heaviest part of an HMO build in Carshalton. Sutton's Residential Enforcement Team has adopted the LACORS Housing Fire Safety Guidance for HMOs, which sets the fire doors, detection and alarms, and the protected escape route for the layout. Building regulations apply on top, and Sutton does not accept a building notice for houses in multiple occupation, so the fire strategy is drawn into a full plans submission before we start.

Sound and energy come next. Bedrooms next to each other and above the kitchen need better sound insulation than a family house had, which usually means insulated stud walls and acoustic ceilings. For letting, the EPC has to reach the legal minimum: since 1 April 2020 landlords covered by the MEES Regulations cannot let a property rated below E without a valid exemption. We fold insulation, heating controls and lighting into the Carshalton HMO works.

• Shared kitchens enlarged or added for the number of occupants
• Extra shared bathrooms and shower rooms
• Thumb-turn bedroom locks that open from inside without a key

VOA Council Tax stock of properties, March 2025, for Carshalton Village, Carshalton on the Hill and Carshalton Beeches & Banstead Road. Counts rounded by the VOA.

People planning hmo conversions in Carshalton may also want bathroom renovation in Carshalton, hmo conversions across Sutton, bathroom fitting in London, how snagging works at handover, hmo conversions anywhere in London and Small Bathroom Ideas.

The GS Renovation Difference in Carshalton

An HMO is inspected against its licence conditions, so it has to be built to them room by room. We price from your approved scheme, check every room size and ceiling height on site before plastering, and install fire doors, detection and escape routes to the LACORS guidance Sutton uses. You get a written quotation, a programme, one site lead, and a file of certificates for the licence application you make as the Carshalton landlord.

• Article 4 and licence position checked before a room is priced
• Existing HMOs brought up to licence conditions, fire works first
• Honest updates if a date or a detail has to move

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254).