HMO Conversions Bishop's Stortford

An HMO conversion in Bishop's Stortford turns a family house into a shared house for unrelated tenants, or brings an existing shared house up to its licence standard. East Herts explains that a change from a house (C3) to a small HMO (C4) is permitted, while a large HMO is sui generis and needs a planning application. The rooms, heights, kitchens and bathrooms are then set by the East Herts HMO Amenity Standards. The landlord applies for any licence, and we build the house to meet it.

For Bishop's Stortford, 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 Bishop's Stortford: 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.

Small and large HMOs in Bishop's Stortford: where the planning line falls

The number of occupants decides the planning route for a Bishop's Stortford HMO. East Herts explains that changing a house (C3) to a small HMO (C4), for three to six unrelated people, is permitted, but a large HMO is sui generis and needs a planning application. In planning terms a large HMO means seven or more occupants. The first question for any conversion is therefore the target number of tenants, because it decides whether an application comes before the build.

East Herts defines an HMO under section 254 of the Housing Act 2004 as a house or flat let to 3 or more tenants forming 2 or more households who share a kitchen, bathroom or toilet. That definition, not the size of the house, triggers the management duties. A small HMO still needs building regulations approval for any structural or fire work, and a planning condition on a newer house can remove the permitted change, so your agent checks the title and planning history first.

Housing in Bishop's Stortford

About 20,560 homes are listed for Bishop's Stortford, and the mix is 79% houses to 20% flats, with 81% built after 1945, 7% in 1919 to 1939 and 12% earlier.

Licensing a shared house in Bishop's Stortford

In East Herts an HMO with 5 or more occupants in 2 or more households needs a licence under the Housing Act 2004. East Herts states that failing to license an HMO is an offence, and landlords can be prosecuted and face an unlimited fine. The licence application is the landlord's to make. Our part in a Bishop's Stortford conversion is to build the house so that it meets the standards the licence inspection checks, and to hand over the certificates that go with it.

From 1 April 2026 a new East Herts HMO licence is charged in two parts, Part 1 and Part 2, with a single lower figure if the full fee is paid on application, and an extra charge for each bedroom above five. The price guide on this page covers building costs only. The 2006 HMO management regulations apply to the house whether or not it needs a licence, and those duties on repair, fire safety and common parts are easier to meet in a house built well from the start.

East Herts HMO standards set bedroom sizes in Bishop's Stortford

The HMO Amenity Standards East Herts applies were adopted in 2007, amended in December 2018, and prepared with all Hertfordshire and Bedfordshire authorities for a consistent approach. They set a minimum sleeping room of 6.51 square metres for one person over 10 and 10.22 square metres for two, the same figures that national mandatory licence conditions use, and no room under 4.64 square metres may be used for sleeping. In a Bishop's Stortford semi, a small third bedroom or box room may fall short, and the layout then has to change or that room becomes a study or store.

The mandatory scheme stops short of flats in purpose-built blocks of three or more self-contained flats, which only an additional licensing scheme can catch.

Height matters as much as area. The standards require every habitable room, kitchen, bathroom and toilet to have a floor to ceiling height of at least 2130mm, which rules out some attic and cellar rooms. A staircase, landing, kitchen or bathroom must never be used for sleeping. We measure each room against these figures at the survey, before a stud is set out, so the room count the landlord plans on is a room count the house can deliver.

Kitchens, bathrooms and fire safety in a Bishop's Stortford HMO

The standards also fix where shared rooms sit. A shared kitchen must be no more than one floor away from the bedroom or living room it serves, a bathroom no more than one floor from the bedroom, and a toilet no more than one floor from living rooms and bedrooms. In a three storey Bishop's Stortford house, that can mean a second kitchen or shower room on the top floor, which brings new drainage and a soil stack into the plan.

Fire safety is the other core of the work. The LACORS housing fire safety guidance is the recognised guide, and building regulations Part B applies to the alterations: fire doors to each letting, a protected escape route down the stair, and interlinked smoke and heat detection sized to the house. Sound insulation between lettings and an energy rating that meets the minimum standard for private lets complete the job. Hertfordshire Building Control inspects the work where you use the council route.

• Existing HMOs upgraded to meet their licence conditions
• En-suite shower rooms added to bedrooms
• Shared kitchens enlarged or added for the number of occupants

VOA Council Tax stock of properties, March 2025, for all 5 statistical areas in Bishop's Stortford. Counts rounded by the VOA.

If this is your first project in Bishop's Stortford, these are worth a look: bathroom renovation in Bishop's Stortford, hmo conversions in Harlow, what a main building contractor does, what a snagging list covers, our London hmo conversions page and Renovation Budget & Contingency.

Why Choose GS Renovation in Bishop's Stortford

An HMO has to pass more tests than an ordinary house, so we plan it against the licence standards from the first survey. We check each room against the East Herts sizes and heights, lay out kitchens and bathrooms within the one floor limits, and build fire separation, doors and detection in the right order. You get one contact, a registered electrician's certificate for the wiring and alarm system, and a record of fire stopping for the licence file. The written quotation follows a site visit.

• Kitchens and bathrooms counted against the council's amenity standard
• Detection laid out to the grade the council's HMO fire guidance sets
• Straight advice on what is and is not worth spending money on

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