HMO Conversions Kensington and Chelsea

HMO conversion in Kensington and Chelsea is shaped as much by licensing as by planning. The borough requires a licence for every privately rented home where three or more people from two or more households share facilities, and it has adopted its own HMO standards above the national minimum. Turning a house into a shared house, or bringing an existing HMO up to licence, means building to those room, kitchen and bathroom sizes and to a fire strategy the licence will be checked against.

In Kensington and Chelsea, 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 Kensington and Chelsea: 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.

Planning for a shared house in Kensington and Chelsea

Start with the number of sharers. Class L of the 2015 General Permitted Development Order allows a Class C3 house to become a Class C4 HMO, and the London Plan glossary puts HMOs for three to six people in C4 and larger ones in Sui Generis. So a shared house for seven or more needs planning permission, and Class L does not allow one former house to become two or more separate C4 HMOs. Whether an Article 4 direction removes the C4 right at your Kensington and Chelsea address is for your planning adviser to confirm.

Once an HMO exists, the emerging plan would keep it. Proposed main modification MM99 to policy HO1 would protect HMOs unless the loss of the HMO or its rooms is for one of two stated reasons. Those are an upgrade to meet the council's HMO standards that costs some rooms, or a layout that cannot be upgraded to meet them. The London Plan likewise says HMOs of a reasonable standard should generally be protected. An upgrade that reduces the room count therefore needs its case made on those grounds.

Housing in Kensington and Chelsea

The Council Tax list puts Kensington and Chelsea at about 89,280 homes, 84% flats against 16% houses; 65% went up before 1919, 8% between the wars and 26% after 1945.

Mandatory and Additional HMO licensing in Kensington and Chelsea

Every privately rented shared house here needs a licence. Kensington and Chelsea's Additional HMO licensing scheme, covering all HMOs outside the Mandatory scheme, was implemented on 1 June 2023. Mandatory licensing covers HMOs with five or more occupiers forming more than one household, but a purpose-built flat in a block of more than two self-contained flats falls under the Additional scheme instead. The landlord or their agent applies for the licence, and the council sets conditions on the property that the building work has to meet.

The stakes are high enough to plan the works around the licence. GOV.UK says renting out an unlicensed HMO can lead to an unlimited fine. One odd case is worth knowing. A building converted into self-contained flats that does not meet the 1991 Building Regulations, with at least a third of the flats privately rented, is an HMO but does not need a licence in Kensington and Chelsea. We ask for the licence application or draft conditions before pricing, so the scope matches what the inspection will look for.

Room, kitchen and bathroom sizes under Kensington and Chelsea standards

The borough has adopted its own HMO standards for three categories of HMO, set above the national licence minimums of 6.51 square metres for one adult and 10.22 for two, with no sleeping room under 4.64 square metres. Its guide for flats in multiple occupation and shared houses asks for sleeping rooms of not less than 8.5 square metres for one person and 11 square metres for two. No room may be occupied by more than two persons, whatever their ages. In Kensington and Chelsea those figures, not the national ones, decide how many lettable rooms a house yields.

The shared rooms are sized too. Kitchens must be not less than 5.5 square metres. Where four or fewer people share, there must be at least one WC per four persons, no more than one floor from each user. A bath must be at least 1600mm x 700mm and a shower at least 800mm x 800mm. We plan drainage for the WCs and showers first, because a soil stack in the wrong place can cost a bedroom.

Fire safety, sound and energy in a Kensington and Chelsea HMO

Fire safety comes first in the build. A shared house needs a protected escape route, fire doors to each letting room and the kitchen, and a linked detection and alarm system suited to the size and layout. Part B and the LACORS housing fire safety guidance that councils use set the approach. In a tall Kensington and Chelsea terrace the single stair is the escape route for every room, so its enclosure, the doors onto it and any glazing in it are upgraded first.

Sound and energy come next. Floors and walls between letting rooms carry more noise than a family house was built for, so we add insulation where rooms stack over each other. The property must also be lettable on energy grounds: since 1 April 2020 landlords cannot let or continue to let properties covered by the MEES Regulations with an EPC rating below E without a valid exemption. Insulation, heating controls and efficient heating are built into the same programme.

• Shared kitchens enlarged or added for the number of occupants
• Bedroom layouts checked against the national minimum room sizes
• Hot water sized for several sharers showering at once, with any gas work by a Gas Safe registered engineer

VOA Council Tax stock of properties, March 2025, for all 21 statistical areas in Kensington and Chelsea. Counts rounded by the VOA.

Once you know the scope of the hmo conversions in Kensington and Chelsea, it helps to read bathroom renovation in Kensington and Chelsea, our Kensington and Chelsea area guide, bathroom fitting in London, how snagging works at handover, hmo conversions anywhere in London and Bathroom Renovation Cost.

Why Choose GS Renovation in Kensington and Chelsea

An HMO conversion is judged room by room against the licence, so the build has to match the standards exactly. We set out rooms, kitchens and bathrooms to the borough's sizes, install fire doors, detection and escape routes in the order building control and the licensing officer need to see them, and co-ordinate the electrician and alarm installer who certify their systems. The landlord or agent applies for the licence. You get a written quotation after a site visit and a written programme.

• En-suites placed only where a soil stack can serve them
• Detection laid out to the grade the council's HMO fire guidance sets
• Founder with 30+ years of hands-on experience

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