HMO Conversions Radlett

HMO conversion in Radlett is a narrow market, and we say so plainly. The VOA figures show 76% of homes here are houses and 63% are semi-detached or detached, a stock built for families rather than sharers. Where the work does arise, it is a landlord turning a large house into rooms for sharers, or upgrading an existing shared house to meet Hertsmere's licence conditions. Either way the job is fire doors and detection, extra bathrooms, room sizes and ceiling heights built to the borough's standards.

For Radlett, 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 (Mayfair Studio and LetCompliance, 2026); a Hertfordshire price follows a site visit. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Radlett: 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.

When a shared house in Radlett needs an HMO licence

Hertsmere requires an HMO licence for any property in Radlett occupied by five or more people in two or more households. The licensing covers houses, flats or parts of buildings of any size, including habitable basements and attics, and commercial premises such as a maisonette over a shop. So a flat above a unit in the village centre let to five sharers is caught just as a large house is. A flat in a purpose-built block of three or more flats is outside mandatory licensing. The owner or their agent makes the licence application.

The licence fee is charged per application with an extra amount for each person above five, for new and renewal applications alike, so the number of rooms is a business decision as well as a design one. We build to the room layout the licence is based on, and give the owner the programme and a schedule of the fire and amenity works for the application. Changing the layout after the licence is granted in Radlett can mean going back to the borough.

Housing in Radlett

The Council Tax list puts Radlett at about 3,500 homes, 24% flats against 76% houses; 12% went up before 1919, 19% between the wars and 67% after 1945.

Planning for a Radlett HMO of more than six people

Hertsmere warns that any property with more than six persons may need planning permission. Under planning law a shared house for three to six unrelated people is Class C4, and moving a family house from C3 to C4 is permitted development unless a local direction removes that right. A house for seven or more sharers is sui generis, so it needs planning permission in Radlett whatever the local rules on smaller HMOs say.

Licensing and planning are separate regimes, and one does not grant the other. A licence can be issued for a house that still lacks the planning use it needs, and a planning permission does not make the rooms licensable. The owner or their agent checks both with Hertsmere before building work is priced, including whether any local direction removing the C3 to C4 right covers the address. We then build to whichever layout is approved and keep the drawings consistent between the two applications.

Room sizes, bathrooms and ceiling heights for Radlett HMOs

Hertsmere's HMO amenity standards set the physical specification a Radlett shared house is built to. Where five or more occupiers share facilities there must be at least one bathroom with a fixed bath or shower for every five sharing occupiers. The standards also require a minimum floor to ceiling height of 2130mm in all rooms, kitchens, bathrooms and toilet compartments, which can rule out some attic and sloping ceiling rooms as bedrooms. Room areas are measured on usable floor, leaving out floor with under one and a half metres of headroom and space lost to fixed boxing or built-in cupboards.

Hertsmere's standards let the inspecting officer reduce a one room unit size by up to 1.5 m2, to 6.5 m2, where communal living or dining space exists. That cannot take a sleeping room below the national mandatory licence minimum of 6.51 square metres for one adult, or 10.22 for two, and no room under 4.64 square metres may be slept in. The standards were prepared with all Hertfordshire and Bedfordshire authorities, and a consultation on new draft standards ran from 20 July 2026 until 31 August, so check the current version before the layout is fixed.

Fire safety and upkeep in a Radlett shared house

Fire safety is the biggest part of an HMO build in Radlett. The LACORS housing fire safety guidance is the recognised guide, and it usually means a protected escape route through the hall and stair. It also calls for self closing fire doors to every bedroom and the kitchen, and interlinked smoke and heat detection with a mains supply. The licensing officer checks the result against the borough's fire standards. We fit the doors and linings as sets, fire stop every service hole, and have the alarm commissioned and certified.

Once the house is let, the landlord keeps it to standard. Hertsmere says rented homes must meet the Housing Acts and the Housing Health and Safety Rating System, and it can apply civil penalties where landlords fail to comply with housing notices. Sound insulation between rooms belongs in the same build. Where the whole house is let on one tenancy it needs an EPC of E or above, while a house let room by room generally needs no EPC. Hard wearing finishes and accessible stopcocks make later repairs quicker.

• Hot water sized for several sharers showering at once, with any gas work by a Gas Safe registered engineer
• Electrics extended to every bedroom, certified by a registered electrician
• Existing HMOs upgraded to meet their licence conditions

VOA Council Tax stock of properties, March 2025, for Radlett. Counts rounded by the VOA.

Related reading for Radlett landlords planning hmo conversions: bathroom renovation in Radlett, hmo conversions in Borehamwood, what a main building contractor does, kitchen fitting in London, our London hmo conversions page and House Rewire Cost.

Trusted HMO Conversions in Radlett

An HMO is judged by planning, by building control and by the licensing officer, and each looks at the same rooms from a different angle. We build to the layout the licence and any permission are based on, fit the fire doors, detection and bathrooms to the borough's standards, and give the owner the programme and schedule of works the paperwork needs. A registered electrician certifies the electrics and alarm wiring, and gas work is done by an engineer on the Gas Safe Register. You get a written quotation after a site visit.

• Kitchens and bathrooms counted against the council's amenity standard
• Every bedroom measured against the national minimum room sizes
• 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).