HMO Conversions Belgravia

HMO conversion in Belgravia is licensing-led work. Westminster's renewed Additional HMO Licensing Scheme took effect on 31 August 2026 and runs until 30 August 2031, covering shared homes where three or more people from two or more households share a kitchen or bathroom. VOA figures for the wider Knightsbridge, Belgravia & Hyde Park area count 71% of homes as flats, so a Belgravia HMO is as likely to be a shared flat or an older converted building as a whole house. Each one is built to Westminster's HMO standards, bedroom sizes and fire safety rules.

In Belgravia, 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 Belgravia: 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 a Belgravia HMO: Class L, C4 and sui generis

The planning route for a Belgravia HMO depends on how many people will live there. Class L of the General Permitted Development Order 2015 allows a change from a C3 dwellinghouse to a C4 house in multiple occupation, which the London Plan defines as three to six people. It does not allow one house to become two or more separate C4 HMOs. A shared house for more than six people is sui generis, so it needs a planning application from the owner or their agent before any works are priced in detail.

Permitted development can also be removed locally. The London Plan asks boroughs considering Article 4 Directions on changes between C3 and C4 to weigh the strategic as well as the local importance of HMOs. Before buying or committing to a Belgravia HMO, have your designer or agent confirm whether any direction or planning condition affects the address. External changes such as a new escape route, extra bins or a rooftop extract in the conservation area are checked at the same time.

Housing in Belgravia

The valuation list shows roughly 6,020 homes in the Knightsbridge, Belgravia & Hyde Park statistical area, of which 67% are pre-1919, 9% interwar and 23% post-1945, split 71% flats to 29% houses.

Westminster's licensing schemes for a Belgravia HMO

Two HMO licences can apply to a Belgravia shared home. A mandatory licence covers a large HMO, rented to 5 or more people forming more than one household. Westminster's additional licensing, first introduced on 30 August 2021 and renewed from 31 August 2026, reaches smaller shared homes across the whole city, including flat shares, bedsits and some converted flats outside mandatory licensing. A flat in a purpose-built block of three or more flats is outside the mandatory scheme but can still fall under the additional one. The landlord applies for the licence, and we carry out the works its conditions set, in the order the council's timetable requires.

Selective licensing is a separate scheme for rented homes that are not HMOs. Westminster's has required privately rented homes not already licensed as HMOs to hold a licence in 15 wards since 24 November 2025, which matters if a shared house is later let to one household instead. GOV.UK warns that renting out an unlicensed HMO can lead to an unlimited fine, so a Belgravia landlord settles which licence applies before the tenancies are signed. The licence decides the specification, and we price the building works against it rather than against a general idea of what an HMO needs.

Bedroom sizes, kitchens and amenities in a Belgravia HMO

Westminster has four sets of HMO standards for different kinds of shared property, updated in April 2021, and it can attach works conditions to a licence to meet them. Under its shared house and flat standard, a kitchen in a Belgravia shared house must be at least 5.5 square metres and laid out for safe use. No more than two people may sleep in one bedroom, with a child counting as a person. Your designer lays out the rooms against the right standard before the licence application, and we build to that plan.

Bedroom sizes are statutory: since 1 October 2018 a mandatory licence requires at least 6.51 square metres for one person over 10 and 10.22 for two people over 10, and no room under 4.64 square metres may be used for sleeping. Westminster says it has a legal duty to act where the statutory HMO bedroom sizes are breached, while allowing an 18-month period for a breach to be corrected. In a tall Belgravia townhouse, the large front rooms comfortably take a double bedroom, while small back rooms and half landings may fall short and become bathrooms or storage instead. Sound insulation between lettings and a sensible bathroom count per occupant are settled in the same layout exercise, before any partition goes up.

Converted Belgravia buildings: licensing and fire safety

A converted Belgravia building can need an HMO licence even when every flat has its own kitchen and bathroom. Westminster says properties with no shared facilities may still need a mandatory or additional licence if they were converted into flats that are not all fully self contained. Its HMO standards treat a building fully converted into self-contained flats as an HMO where the conversion does not fully meet the 1991 Building Regulations and fewer than two thirds of the flats are held by long leaseholders.

Fire safety is where that licensing turns into building work. Westminster's self-contained flat HMO standard takes 60 minutes of fire resistance as the building regulations benchmark, but accepts 30 minutes in most existing conversion flat buildings where appropriate automatic fire detection is fitted. In a Belgravia HMO we fit fire doors with self-closers to each letting, linked detection and alarms, and a protected escape route, following Part B and the LACORS housing fire safety guidance your designer specifies.

• Protected escape routes through the hall, stair and landings
• Existing HMOs upgraded to meet their licence conditions
• Small HMO conversions for three to six sharers

VOA Council Tax stock of properties, March 2025, for the Knightsbridge, Belgravia & Hyde Park statistical area, which also covers parts of Knightsbridge. Counts rounded by the VOA.

Related reading for Belgravia landlords planning hmo conversions: bathroom renovation in Belgravia, hmo conversions across Westminster, how building control works in London, what a kitchen fit covers, how we handle hmo conversions across London and House Rewire Cost.

Why Choose GS Renovation in Belgravia

A Belgravia landlord converting or upgrading an HMO needs a builder who works from the licence conditions, not from guesswork. We give a written quotation after a site visit, build to the layout your designer has checked against Westminster's HMO standards, and fit the fire doors, detection and escape route as one programme. The founder has more than thirty years of hands-on experience, and handover includes the electrical and gas certificates and the fire alarm records a licensing inspection will ask to see.

• Rated 4.9 from 31 reviews on MyBuilder
• Every bedroom measured against the national minimum room sizes
• Article 4 and licence position checked before a room is priced

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