HMO Conversions Sutton

HMO conversion in Sutton now starts with planning permission for a new shared house. Sutton's Article 4 Direction removing the permitted change from a family house to a small HMO covers the whole borough and came into force on 22 February 2025. Licensing then applies to small and large HMOs alike under the borough-wide Additional Licensing Scheme. We build the rooms, kitchens, bathrooms and fire protection to Sutton's HMO standards, so the finished house matches the consent and the licence the landlord applies for.

In Sutton, 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 Sutton: 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.

Sutton's borough-wide HMO Article 4 Direction and licensing

Turning a Sutton house into a small shared house now needs planning permission. Nationally, Class L permits a change from a C3 dwellinghouse to a C4 house in multiple occupation without an application, but Sutton's Article 4 Direction removes that right across the whole borough. It was made on 22 February 2024, confirmed by the Housing, Economy and Business Committee on 26 November 2024, and came into force on 22 February 2025. The London Plan treats HMOs for three to six people as C4 and larger ones as Sui Generis, so every new HMO here needs planning permission.

Licensing sits on top of planning. Sutton's Additional Licensing Scheme for HMOs applies to the whole borough, so an HMO below the 5-person mandatory threshold still needs a licence. Licences are issued for up to five years, and the owner or their agent makes the application. A resident landlord may have up to 2 lodgers before the property counts as an HMO. Our part is building the layout to the standards the licence is checked against, with the fire separation, detection, kitchens and bathrooms in place before the inspection.

Housing in Sutton

About 86,280 homes are listed for Sutton, and the mix is 61% houses to 39% flats, with 46% built after 1945, 41% in 1919 to 1939 and 13% earlier.

Room sizes and facilities under Sutton's HMO standards

Sutton's HMO standards set the room sizes a layout has to meet. A bedroom for one person needs at least 10 square metres, or 15 for two, where there is no cooking in the room. Those fall to 6.51 and 10.22 where a communal lounge or a kitchen with dining space is provided, and the lower figures only apply where that shared room exists. They match the national minimum sleeping room sizes that are conditions of every mandatory HMO licence in England, which also bar any room under 4.64 square metres from use for sleeping. Every room needs a floor to ceiling height of at least 2.3m, except existing attic rooms, and no more than two people, living as a couple, may sleep in one room.

Facilities are counted as carefully as floor area in Sutton. A shared kitchen should serve no more than five people, and every sharer needs a shared bathroom within one floor of their room. That often decides the design: a six-bedroom house needs two kitchens or a second kitchen area, and bathrooms placed so no bedroom is more than one floor away. We set out the kitchens and bathrooms to those numbers at first fix, so the licensing inspection finds the building as drawn.

Fire safety in a Sutton HMO: LACORS and building control

Fire protection is the core of an HMO build. Sutton's Residential Enforcement Team has adopted the LACORS Housing Fire Safety Guidance for HMOs, which sets the fire door, detection and escape route standard the building is checked against. In a two-storey shared house that usually means a protected stair, fire doors with self-closers to every letting and the kitchen, interlinked mains-powered detection, and emergency lighting where the escape route needs it. A registered electrician installs and certifies the alarm system.

Building regulations apply alongside the licence. Sutton says a building notice cannot be used for houses in multiple occupation such as shared houses or bedsits, so the works go in as a full plans application with fire and means of escape details. Sutton puts the minimum approval time for full plans at 5 weeks. Sound insulation between lettings, especially under bedroom floors, and an EPC that meets the minimum energy standard for letting are built into the same programme.

Large HMOs and concentration limits in Sutton

An HMO for more than six people is sui generis under the London Plan glossary, and Sutton's Local Plan Policy 10 sets a concentration test for new large HMOs. Where more than 20% of properties within 100 metres either side of the site are already HMOs, Sutton treats that as a harmful concentration. The owner's designer checks the street before a scheme is drawn, because a strong layout can still fail on location alone.

The London Plan's Policy H9 says boroughs should take account of the role of HMOs in meeting housing needs, and that HMOs of a reasonable standard should generally be protected. For a Sutton landlord that points toward upgrading an existing HMO to meet licensing rather than always starting from a family house. We price upgrades too: new fire doors, detection, an extra bathroom or kitchen, and the room reconfiguration that brings an older shared house up to Sutton's standards.

• Shared kitchens enlarged or added for the number of occupants
• Electrics extended to every bedroom, certified by a registered electrician
• Sound lining to bedroom walls and party walls

VOA Council Tax stock of properties, March 2025, for all 24 statistical areas in Sutton. Counts rounded by the VOA.

If you are weighing up options for your Sutton property, it is worth reading bathroom renovation in Sutton, our Sutton area guide, what a main building contractor does, how snagging works at handover, hmo conversions anywhere in London and Renovation Budget & Contingency.

Why Choose GS Renovation in Sutton

An HMO in Sutton has to satisfy planning, building control and the licensing inspection, and we build it to all three at once. We visit, measure the rooms against Sutton's standards and give you a written quotation. The owner or their agent applies for planning and the licence, and we build to the consent and the licence conditions. Registered electricians certify the alarms and wiring, and we hand over the certificates the licensing officer will ask to see. The job is founder-led, with one point of contact.

• Existing HMOs brought up to licence conditions, fire works first
• Fully insured, with cover in place on every site
• En-suites placed only where a soil stack can serve them

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