HMO Conversions Ruislip
House to HMO conversions and licence upgrades in Ruislip, fire doors, detection and shared amenities built to the council's licence standards.
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- London guide: £40,000 to £75,000
- Free site survey, itemised quote
An HMO conversion in Ruislip now starts with a planning application, wherever the house is. Across Hillingdon, turning a home into a shared house for 3 or more unrelated people needs planning permission, and the borough also licenses every HMO, large or small. Ruislip's stock is 73% houses, so the candidates are family semis and terraces. We build the rooms, kitchens, bathrooms and fire protection to the consent and licence conditions the landlord secures.
In Ruislip, 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 Ruislip: 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.
Price guide
| Work | Indicative range |
|---|---|
| Light HMO conversion, London, 4 to 6 tenants, construction only (Mayfair Studio) | £40,000 to £75,000 |
| Full HMO conversion with en-suites, London, 5 to 6 beds (Mayfair Studio) | £90,000 to £150,000 |
| 5-bed HMO conversion, London and South East (LetCompliance) | £35,000 to £60,000 |
| Fire safety works, typical 5-bed HMO, UK guide (LetCompliance) | £5,000 to £9,500 |
| En-suite added to one bedroom, London (Mayfair Studio) | £3,500 to £8,000 per room |
| Second shared bathroom, UK guide (LetCompliance) | £4,000 to £9,000 |
Indicative ranges from published cost guides (Mayfair Studio and LetCompliance, 2026), not a quotation. Each row names its source and whether it is a London, UK or England-wide figure. Prices checked September 2026.
Quick estimate from published guides
Guide range: choose above
The borough-wide HMO Article 4 direction and Ruislip houses
Nationally, Class L of the General Permitted Development Order lets a family house become a C4 HMO for three to six people without an application. In Hillingdon that route has gone. Full Council voted on 27 November 2025 to bring in a borough-wide HMO Article 4 direction, so a small shared house in Ruislip is now a planning application first, with the room layout fixed at that stage. Price the building work only once the application drawings exist, because they set the room count.
Larger HMOs were never permitted development. Under the London Plan glossary, a shared house for more than six people is sui generis. Hillingdon Policy DMH 5 asks a large HMO to show good accessibility to local amenities and public transport, and satisfactory living conditions. A Ruislip house within walking distance of the High Street or Ruislip Manor station has more to point to, but the planning case is the landlord's, made with their agent.
Housing in Ruislip
About 20,620 homes are listed for Ruislip, and the mix is 73% houses to 27% flats, with 47% built after 1945, 52% in 1919 to 1939 and 1% earlier.
Which HMO licence a Ruislip shared house needs
Every HMO in Ruislip now falls under one Hillingdon licensing scheme or the other. The mandatory scheme covers large HMOs, meaning 5 or more unrelated occupants. Cabinet then agreed on 19 February 2026, following a 10-week consultation, to adopt a boroughwide additional HMO licensing scheme. It reaches shared homes of fewer than five people from two or more households. The application deadline was 23 August 2026, and enforcement could begin from 24 August 2026.
An additional licence runs for five years, and Hillingdon says the scheme works alongside the borough-wide Article 4 direction introduced in December. Letting an HMO without the licence it needs risks an unlimited fine, according to GOV.UK. The landlord applies; our job is to build what the conditions require. In practice we ask for the licence standards before pricing a Ruislip HMO, because they fix the number of bathrooms, the kitchen layout and the fire protection.
Hillingdon HMO standards for rooms, kitchens and bathrooms in Ruislip
The HMO standards turn the plan into numbers. Hillingdon's HMO standards say a common living room in a shared house should be at least 10m2. Any part of a room where the ceiling is under 1.53m high, typically under an attic slope, is left out of the measurement. Where kitchen facilities sit within another room, Hillingdon wants an extra 3.7m2 of floor area on top. In a Ruislip semi, that often decides whether the front room stays a lounge or becomes a letting room. Bedrooms must also meet the national minimums, mandatory licence conditions since 2018: 6.51 square metres for one adult, 10.22 for two, and no sleeping room under 4.64.
Mandatory licensing does not reach a flat in a purpose-built block of three or more self-contained flats; where such a flat is shared, it is the council's additional scheme, if any, that applies.
Kitchens and bathrooms grow with the household. Hillingdon sets one bathroom, with a fixed bath or shower, per 5 sharers as the minimum, and one fixed impervious worktop of 1500 x 600 mm or more for each group of 5 using one set of kitchen facilities. Extractor fans must be humidistat controlled, at least 60 l/s in kitchens and 15 l/s in bathrooms. We plan the drainage and duct runs for these at the Ruislip survey.
Fire safety and sound between lettings in a Ruislip HMO
Fire protection shapes an HMO conversion more than any other part of the build. The stair and hall become a protected escape route, with fire doors and self closers on every letting room, a linked detection and alarm system to the grade the licence asks for, and emergency lighting where the layout needs it. The LACORS housing fire safety guidance is the recognised guide that councils use. A change from a house to a C4 HMO is not itself a material change of use under the Building Regulations. The building work done for it in Ruislip still has to comply with Part B.
Sound matters more in a shared house than in a family one, because each room is someone's home. Interwar floors in a Ruislip semi carry footsteps easily, so we add insulation and resilient ceilings under the rooms above where the design calls for it. Energy counts too. Under the MEES Regulations, a property rated below E on its EPC has not been lettable since 1 April 2020 unless an exemption applies, so insulation goes in while the floors are open.
- Electrics extended to every bedroom, certified by a registered electrician
- Large HMO conversions for seven or more, once planning is granted
- Service holes sealed so each bedroom and the kitchen stay separate fire compartments
VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Ruislip. Counts rounded by the VOA.
Trusted HMO Conversions in Ruislip
An HMO answers to three documents at once: the planning consent, the licence conditions and the Building Regulations, and they do not always agree on fire doors, room sizes or kitchens. We ask for all three before pricing, then build the fire protection, bathrooms and kitchens in an order that lets building control and the licensing officer see them. The landlord or their agent makes the applications. We give them the programme and the installers' certificates, and one person on our side answers the landlord throughout.
- Existing HMOs brought up to licence conditions, fire works first
- One point of contact on the phone, not a call centre
- Fire doors, closers and seals fitted to every door on the escape route
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
FAQ
Frequently Asked Questions about HMO Conversions Ruislip
How much does an HMO conversion cost in Ruislip?
Published figures put a light HMO conversion for four to six tenants at £40,000 to £75,000 in construction, and a full conversion with an en-suite to every bedroom at £90,000 to £150,000 (Mayfair Studio, 2026). A Ruislip house moves within that range with the fire works, the extra bathrooms and the kitchen size. Planning and licence fees are the landlord's and sit outside our quote.
Does an owner need planning permission to turn a Ruislip house into an HMO?
Yes. Hillingdon now requires planning permission everywhere in the borough before a home becomes an HMO shared by 3 or more unrelated people. Full Council agreed on 27 November 2025 to implement the borough-wide Article 4 direction that removed the old permitted route. Your agent or designer makes the application, and we build to the approved layout once it is granted.
Which HMO licences apply to a shared house in Ruislip?
Two schemes cover Ruislip. The mandatory one is for large HMOs, with 5 or more unrelated occupants. Hillingdon's boroughwide additional HMO licensing scheme covers smaller shared homes, below five people, drawn from two or more households, and those licences last five years. The landlord applies, and the property then has to meet the conditions attached to the licence.
How big does a shared living room in a Ruislip HMO need to be?
Hillingdon's HMO standards say a common living room in a shared house should be at least 10m2. Floor space beneath a ceiling of less than 1.53m, as in a room in the roof, is not counted. Measure the rooms early, because a lounge that looks generous can fall short once the sloping areas are taken out.
How many bathrooms does a Ruislip HMO need?
One for every 5 sharers at least, each with a fixed bath or shower, under Hillingdon's minimum standards for HMOs. A house for six people therefore needs two. We plan the drainage runs for the extra bathroom at the survey stage, because a soil pipe route through a semi often decides where the second bathroom can go.
When is a Ruislip HMO sui generis rather than C4?
When more than six people live there. The London Plan glossary puts shared houses for three to six people in Use Class C4, and anything larger outside the use classes as sui generis. A large HMO in Hillingdon also has to meet Policy DMH 5 on access to amenities, public transport and living conditions.
What happens if a Ruislip landlord lets an unlicensed HMO?
The penalty can be an unlimited fine, GOV.UK warns, for renting out an HMO that should be licensed and is not. Under Hillingdon's additional scheme the deadline to apply was Sunday 23 August 2026, and enforcement became possible the next day. Apply before the rooms are let, and give us the conditions so the works match them.
Does the London Plan protect existing HMOs?
Yes, in general terms. London Plan 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. For a landlord upgrading an existing shared house, that policy supports bringing it up to the licence standards rather than taking it out of use.
What fire safety work does a Ruislip HMO conversion need?
A shared house normally needs a protected escape route through the hall and stair, fire doors with self closers on each letting room, and a linked detection and alarm system. The exact grade depends on the number of storeys and occupiers, and the licence conditions and building control set it. We fit the doors, detectors and fire stopping to the specification and hand over the commissioning certificate.
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