HMO Conversions Whetstone

An HMO conversion in Whetstone needs planning permission before anything else, because Barnet has removed the usual right. Barnet Council records that a borough-wide Article 4 Direction put in place in May 2016 requires planning permission for all future HMOs, and it says it will take enforcement action against unauthorised ones. After planning comes licensing, then the build: fire doors, detection, room sizes, kitchens and bathrooms laid out to the standards the licence will set.

In Whetstone, 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 Whetstone: 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.

Why a Whetstone HMO needs planning permission

A shared house in Whetstone needs planning permission because Barnet removed the usual permitted development right. Nationally, Class L of the General Permitted Development Order allows a Class C3 dwellinghouse to become a Class C4 house in multiple occupation without an application. Barnet's Article 4 Direction on small HMOs, with a start date of 2016-05-29 on the national planning data record, takes that right away across the borough. That single change sets the paperwork for every shared house here.

The London Plan glossary puts HMOs for three to six people in Use Class C4 and larger ones in Sui Generis, so a bigger shared house was always a planning matter. In Whetstone the smaller ones now are as well. The landlord or their agent makes the application, with a designer's drawings showing room sizes, shared space, refuse and cycle storage. Budget time for the decision before booking the build, because work started early is work at risk.

Housing in Whetstone

The valuation list shows roughly 7,730 homes in Whetstone, of which 12% are pre-1919, 39% interwar and 48% post-1945, split 49% flats to 51% houses.

How the London Plan and Barnet treat HMOs in Whetstone

The London Plan takes a balanced view of shared housing, and Barnet's direction sits inside it. 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. The Plan also asks boroughs weighing an Article 4 Direction on C3 to C4 changes to consider the strategic as well as local importance of HMOs. A well built HMO is therefore a legitimate use to argue for.

The limits are firm all the same. Class L does not permit a building previously used as a single C3 dwellinghouse to be used as two or more separate C4 HMOs, so one Whetstone house cannot be split into two shared houses under permitted development. Barnet Council says it will take enforcement action against unauthorised and illegal HMO properties. An HMO running without consent can face a requirement to stop, which undoes the investment in the fit-out.

Licensing a Whetstone HMO before the first tenant moves in

Licensing is separate from planning, and a Whetstone HMO may need both. GOV.UK defines a large HMO as one rented to 5 or more people who form more than 1 household, which needs a mandatory licence, and says even a smaller HMO may still need a licence depending on the council area. Renting out an unlicensed HMO can lead to an unlimited fine. The landlord applies to Barnet Council, and we build to the conditions.

Barnet publishes a register of properties licensed under its HMO Licensing Scheme, updated monthly, as section 232 of the Housing Act 2004 requires. That register is a useful check before buying a Whetstone house already run as an HMO, because an existing licence and its conditions show what standard the house was held to. Where a licence is being renewed, the landlord's list of required works from the council becomes our scope of work.

Room sizes, fire safety and energy in a Whetstone HMO

Fire safety drives the largest share of the building work in an HMO. GOV.UK defines an HMO as a property rented by at least 3 people who are not from 1 household but share facilities such as the bathroom and kitchen, and that sharing is why the escape route matters. Expect fire doors to each letting room, linked detection, a protected stair and emergency lighting where the layout needs it, following Part B and the LACORS housing fire safety guidance.

Every bedroom is measured against the national licence minimums before the plaster goes on: a single adult needs 6.51 square metres, a couple 10.22, and anything under 4.64 is not a bedroom. The kitchen, bathroom and WC count follows the number of occupants in the council's amenity standards. Energy matters too: since 1 April 2020 a property covered by the MEES Regulations cannot be let with an EPC rating below E without a valid exemption. Sound insulation between letting rooms reduces complaints and turnover.

• Snagging before the council's licence inspection
• Emergency lighting on the escape route where the house needs it
• Shared kitchens enlarged or added for the number of occupants

VOA Council Tax stock of properties, March 2025, for Whetstone East and Oakleigh Park. Counts rounded by the VOA.

Work in Whetstone rarely sits on its own, so you may also want bathroom renovation in Whetstone, hmo conversions across Barnet, bathroom fitting in London, what a snagging list covers, our London hmo conversions page and House Rewire Cost.

The GS Renovation Difference in Whetstone

An HMO is judged on paper by the planning officer and the licensing officer, and in person by the fire risk assessor and the tenants. We build to all of them. Your designer's approved drawings and the licence conditions become our specification: fire doors hung and adjusted, detection wired and tested by a registered electrician, rooms checked against the sizes before plastering, and kitchens and bathrooms laid out for the occupancy. The landlord holds the consents and the licence application.

• Kitchens and bathrooms counted against the council's amenity standard
• A written scope and programme agreed before work starts
• Every bedroom measured against the national minimum room sizes

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