This page tracks the planning applications made for HMOs by searching through all of the applications.
There are currently 27 applications under consideration for HMOs.
In the last six months 13 have been approved, and 22 refused.
These figures were last updated today.
Read below to see why there are more applications than there have been before.
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ⓘ Why are there more HMO applications than before?
HMO Planning Requirements Before December 2025
Before the new rules took effect, Hillingdon operated under a "two-tier" system based on the size and location of the property. Large HMOs—defined as properties housing seven or more unrelated people—were classified as sui generis and have always required a formal planning application across the entire borough.
However, small HMOs (housing between three and six people) were generally considered "permitted development". This meant owners could convert a family home into a small HMO without any planning permission, provided the property was not located in a restricted area.
Specifically, planning applications for small HMOs were only mandatory if the property was located within the former Brunel or Uxbridge South wards. In those two wards, an Article 4 Direction was already in place to protect the character of neighborhoods surrounding the university. In all other parts of the borough, these conversions could proceed without council oversight.
HMO Planning Requirements After December 2025
As of December 11, 2025, the council implemented a borough-wide immediate Article 4 Direction. This removed permitted development rights for small HMOs in all 21 wards of Hillingdon, eliminating the distinction between "hotspot" wards and the rest of the borough.
Now, every new HMO conversion, whether for three people or ten, requires a full planning application before the change of use can legally occur. This gives the council the power to assess every proposal against local policies regarding parking, waste storage, and the impact on residential amenity.
Why Planning Applications Have Increased
There are significantly more planning applications for HMOs today than a year ago because the council effectively closed the legal route that previously allowed small HMOs to be created without oversight. The increase is driven by three main factors:
Mandatory Compliance: New conversions in the 19 wards that previously allowed permitted development must now submit formal applications.
Regularisation: Landlords with existing small HMOs are now filing for Certificates of Lawful Use to officially document that their properties were established before the new restrictions began.
Increased Enforcement: The council now requires investigation into all HMO complaints to verify their planning status, as many small HMOs no longer have automatic rights to operate without permission.
Change of use from Use Class C4 (House in Multiple Occupation) to a Sui Generis 7-bed, 7-person HMO and resubmission and extension of the approved dormer extension. Amendments to fenestration. Provision of refuse and cycle storage (part retrospective).
Validated: 26 Nov 2025(3 months ago)
Click to see the 9 applications older than 6 months ↓
Change of use from a dwellinghouse (Use Class C3) to a 6 person HMO (Use Class C4) (Application for a Certificate of Lawful Development for a Proposed Development).
Change of use from C4 small HMO to C3(b), erection of a single-storey rear extension following amendments to fenestrations (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from a 6-bedroom small House in Multiple Occupation (HMO) (Use Class C4) to a 7-bedroom HMO (Use Class Sui Generis) for up to 7 people, including new cycle store (part-retrospective)
Change of use from use Class C3 (dwellinghouse) to use Class C4 (HMO for up to 6 persons) (Application for a Certificate of Existing Use for a Proposed Development)
Proposed conversion of existing dwellinghouse from Class C3 (single family dwellinghouse) to Class C4 (small scale HMO) with the addition of 1 obscure glazed window in the upper floor side elevation (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from Dwellinghouse (Class C3) to Large 11-bed House in Multiple Occupation (Sui Generis), including conversion of roof space to habitable use with a rear dormer, 3 side facing roof lights, 2 front facing roof lights and two storey rear extension. Erection of outbuilding serving as co-working space in the rear garden.
Details pursuant to the discharge of Conditions 7 (Parking Provision) of planning permission ref. 75428/APP/2023/443, dated 19-05-23 (Conversion of Class C3 Dwellinghouse into 7B7P Sui Generis HMO with two storey side extension and part double storey rear extension)
Details pursuant to the discharge of Condition 3 (landscape scheme) of planning permission ref. 13428/APP/2024/992, dated 12-07-2024 (Change of use from Class C4 House in Multiple Occupation (HMO) to Sui Generis HMO (6 persons to 7) and conversion of the garage to habitable use with associated cycle parking to the front)
Change of use from a dwellinghouse (Use Class C3) to a House in Multiple Occupation (HMO) (Use Class C4) (Application for a Certificate of Lawful Development for an Existing Development)
Change of use from Class C3 (Dwellinghouse) to C4 (Small HMO) up to six persons (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use of a single dwellinghouse (Class C3) to a 3 x bedroom HMO accommodation (Class C4) (Application for a Certificate of Lawful Development for a Proposed Development)
Conversion of roof to habitable accommodation to include a hip to gable roof extension and rear dormer and 2 side facing windows and alterations to fenestration. Change of use from a Class C3 dwelling to a 6-room House of Multiple Occupation (HMO) with retention of a self-contained annexe to be used as a separate dwelling.
Change of use from Class C3 (Dwellinghouse) to Class C4 (HMO) for a maximum of 6 persons (Application for a Certificate of Lawful Development for a Proposed Development)
Extension and conversion of first floor of 15b Station Road to a 6-bed HMO, change of use Class C3 (dwelling house) to Class C4 (HMO) including alterations to the existing first floor to provide external amenity space. Erection of ground floor retail (Class E) storage space and bike and bin storage.
Validated: 25 Sep 2025(5 months ago)
Click to see the 10 applications older than 6 months ↓
Conversion from a residential dwellinghouse (Class C3) to a 6-bed HMO (Class C4) (Application for a Certificate of Lawful Development for a Proposed Use)
Change of use from a Class C3 (Dwellinghouse) to a Class C4 (Small HMO) for up to 6 people(Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from a dwellinghouse (Use Class C3) to a House in Multiple Occupation (HMO) (Use Class C4) for up to 6 people. (Application for a Certificate of Lawful Development for a Proposed Development).
Conversion of an existing house (Use Class C3) into an HMO (House in Multiple Occupation, Use Class C4) (Application for a Certificate of Lawful Development for a Proposed Development)
Conversion of first floor of 15b Station Road to a 3-bed HMO, change of use Class C3 (dwelling house) to Class C4 (HMO) including alterations to the existing first floor to provide external amenity space. Erection of ground floor retail (Class E) storage space
Change of use from Class C3 (Dwellinghouse) to Class C4 (small HMO) for up to 6 persons including the erection of a single storey rear extension and cycle storage (amended description)
Change of use from Use Class C3 (Dwellinghouse) to a 7-Bedroom (9-person) House in Multiple Occupation (HMO) (Use Class Sui Generis)(Retrospective application)
Change of use from Class C3 (Dwelling) to Class C4 (HMO) including conversion of garage to habitable use (Application for a Certificate of Lawful Development for a Proposed Development).
Change of use from Use Class C3 (dwellinghouse) to Use Class C4 (House in Multiple Occupation for up to 6 people) (Application for a Certificate of Lawful Development for a Proposed Development).
Change of use from dwellinghouse (Use Class C3) to a 6-person House in Multiple Occupation (Use Class C4), including the conversion of roof space to habitable use, construction of a rear dormer, and installation of 2 front roof lights (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from Class C3 (dwellinghouse) to Sui Generis (6 bed-7 person HMO) with the erection of a first-floor rear extension and loft conversion to include a rear dormer, front rooflights and hip to gable end. Private amenity space, refuse area, cycle/car parking (amended description)
Change of use from Use Class C3 (dwellinghouse) to Use Class C4, to form a six-bedroom, six-person House in Multiple Occupation (HMO) with cycle store. Erection of a single storey extension to the rear, conversion of roof space to habitable use to include a rear dormer
Validated: 30 Dec 2025(2 months ago)
Click to see the 8 applications older than 6 months ↓
Conversion of roof space to habitable use to include a hip to gable roof extension, rear dormer and 3 front roof lights, single storey rear extension and change of use to 5-bedroom 5-person House in Multiple Occupation (HMO) (Part retrospective application).
Conversion of roofspace to habitable use to include a hip to gable roof extension, rear dormer and 3 front rooflights, single storey rear extension and change of use to 6bedroom 6person HMO.(Part retrospective).
Change of use from (C3 use class) to a small House in Multiple Occupation (HMO) (C4 use class) (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from Class C3 (Residential Dwelling) to Class C4 (Houses in Multiple Occupation) for 5 persons (Application for a Certificate of Lawful Development for a Proposed Development)
Conversion of roof space to habitable use to include a rear dormer, 2 front roof lights and conversion of roof from hip to gable end. Change of use from Class C3 (Dwellinghouse) to Class C4 (House in Multiple Occupation). (Application for a Certificate of Lawful Development for a Proposed Use and Development)
For change of use from C4- house in multiple occupancy (HMO) to Sui Generis HMO (7 bedroom and 7 persons)with no external alterations.(Retrospective application)
Validated: 16 Dec 2025(2 months ago)
Click to see the 5 applications older than 6 months ↓
Conversion of an HMO (House in Multiple Occupation, (Use Class C4) into a Residential Institution, (Use Class C2) (Application for a Certificate of Lawful Development for a Proposed Development).
Details pursuant to the discharge of Condition 2 (Cycle parking, refuse) of Appeal Decision ref: APP/R5510/W/23/3319240, (Hillingdon Council ref. 27994/APP/2021/3851), dated 24-01-2024 (Change of use from Class C4 house in multiple occupancy (HMO) to Sui Generis HMO for 7 bed and 7 persons with no external alterations.)
Details pursuant to the discharge of Condition 2 (Cycle parking, refuse) of Appeal Decision ref: APP/R5510/W/23/3319240, (Hillingdon Council ref. 27994/APP/2021/3851), dated 24-01-2024 (Change of use from Class C4 house in multiple occupancy (HMO) to Sui Generis HMO for 7 bed and 7 persons with no external alterations.)
Change of use from a 5-bedroom residential property (Class C3) to an 8 bedroom HMO (Sui Generis) with associated amendments to front garden and car parking.
Change of Use from a 2-Bedroom Ground Floor Flat (Use Class C3) to a 4-Person House in Multiple Occupation (Use Class C4) and associated replacement of windows and doors, provision of bike storage, and bin storage.
Validated: 26 Feb 2026(15 days ago)
Click to see the 3 applications older than 6 months ↓
Change of use from Class C3 (Dwellinghouse) to C4 (Small HMO) up to six persons (Application for a Certificate of Lawful Development for a Proposed Development)
Demolition of existing garage. Erection of a single storey extension to side. Change of use from Class C3 (Dwellinghouse) to Sui Generis (House in Multiple Occupation).
Demolition of the existing rear extension and construction of a new single-storey rear extension (retrospective), and change of use from a C4 small HMO to an 8-unit HMO (sui-generis) (proposed), including associated amenity, refuse and cycle storage (revised plans 10.02.26).
Existing use of the property as a Small HMO Class C4 (HMO) for up to 6 persons (Application for a Certificate of Lawful Development for a Existing Use)
Change of use from Class C3 (Dwellinghouse) to Class C4 (Small Scale HMO), along with the erection of a single storey rear extension (Application for a Certificate of Lawful Development for a Proposed Development)
Lawful certificate seeking confirmation continued Class C3 residential use or change of use to C4 House in Multiple Occupation up to six persons. (Application for a Certificate of Lawful Development for a Proposed Development)
Validated: 10 Oct 2025(5 months ago)
Click to see the 5 applications older than 6 months ↓
Change of use from (C3 Use Class) to a small House in Multiple Occupation (HMO) (C4 Use Class) (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from existing 6-bed, 6-person HMO (Use Class C4) to a 7-bed, 7-person HMO (Use Class Sui Generis) with associated refuse and cycle storage provision
Proposed change of use from a Residential dwelling (Class C3) to a 6-persons max small HMO (Class C4) (Application for a Certificate of Lawful Development for a Proposed Development)
Proposed change of use from C3( Residential Family Dwelling) to C4 for 6 persons max (Small HMO) (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from C3 to a small House in Multiple Occupation (Use Class C4) for up to six unrelated persons, together with the demolition of existing garages to provide three off-street car parking spaces, six cycle parking spaces and a refuse store (retrospective).
Change of use from Class C3 dwellinghouse to C4 HMO for up to 6 persons. (Application for a Certificate of Lawful Development for a Proposed Development)
Validated: 29 Dec 2025(2 months ago)
Click to see the 18 applications older than 6 months ↓
Details pursuant to the discharge of Conditions 5 (Bicycle Storage) of planning permission ref. 47363/APP/2023/1245, dated 22-06-2023 (Change of use from a Class C4 (HMO) to a Sui Generis 6-bed, 7 person HMO with the conversion of roof space to habitable use to include a rear dormer and one front roof light; including associated bin and bike storage).
Erection of a two storey side extension and a single storey extension to the rear, following the demolition of the existing store room, smoking room and conservatory. Change of use from a dwelling with up to six people living together as a single household and receiving care (Use Class C3(b)) to a 7-bed house in multiple occupation for seven residents living together as a single household where care is provided for residents (Use Class C2) (Amended Description)
Conversion of roof space to habitable use, including the construction of a rear dormer and from hip to gable end roof extension. Change of use from dwellinghouse (Use Class C3) to House in Multiple Occupation (Use Class C4) (maximum six-person HMO) (Application for a Certificate of Lawful Development for a Proposed Development)
Proposed Change of Use from Class C3 Dwellinghouse to Class C4 House in Multiple Occupation (Application for a Certificate of Lawful Development for a Proposed Use)
Change of use from dwellinghouse (Class C3) to small house in multiple occupation (Class C4), including conversion of garage space to habitable space and amendments to fenestrations.
Validated: 20 Jan 2026(1 month ago)
Click to see the 1 applications older than 6 months ↓
Change of use from Use Class C3 (dwellinghouse) to Use Class C4 (small House in Multiple Occupation for up to six people) (Application for a Certificate of Lawful Development for a Proposed Use).
Erection of rear extension, hip-to-gable roof conversion and rear dormer, and conversion of property from Class C3 (dwellinghouse) to Class C4 (small HMO) for up to 6 persons (Part retrospective application).
Validated: 23 Dec 2025(2 months ago)
Click to see the 2 applications older than 6 months ↓
Conversion of existing residential dwelling (Class C3) into a 6-bedroom HMO (Class C4) (Application for a Certificate of Lawful Development for a Proposed Development).
Rear and side Dormer (introduction and enlargement) and amendments to the rear fenestration to accommodate the conversion of dwellinghouse (Class C3) to small House in Multiple Occupation (Class C4) (up to 6 persons) with associated parking, cycle store and amenity space.
Change of use from a Class C4 small HMO to an 8-person Sui Generis large HMO including erection of a first floor rear extension with amendments to fenestration and associated alterations (revised description 15.08.25)
Change of use from a 2-bedroom flat (Use Class C3) to a 3-bedroom 3-person small House in Multiple Occupation (Use Class C4) (Application for a Certificate of Lawful Development for a Proposed Development)
Confirmation of change of use from a dwellinghouse (Use Class C3) into a House in Multiple Occupation (HMO) (Use Class C4) (Application for a Certificate of Lawful Development for a Proposed Use)
Confirmation of continuous use of the property as a C4 HMO for 6 people. Erection of single-storey side extension. Erection of single-storey rear extension. (Application for a Certificate of Lawful Development for an Existing Development)
Confirmation of the existing and continued use as a Class C4 House in Multiple Occupation (Application for a Certificate of Lawful Development for a Existing Development).
Change of use from a dwelling with up to six people living together as a single household and receiving care (Use Class C3(b)) to a 7-bed house in multiple occupation for seven residents living together as a single household where care is provided for residents (Use Class C2) (Amended Description)
Change of use from Class C3 (Dwellinghouse) to Class C4 (HMO) for up to 6 persons, Erection of single-storey rear and side extension, including cycle storage and bin storage to the front.
Erection of a single storey side and rear wrap around extension, insertion of window to first floor flank wall, change of use from single family residential to 5 bed 5 person HMO.
Change of use from Class C3 (Dwellinghouse) to Class C4 (Small House in Multiple Occupation) of up to six persons (Application for a Certificate of Lawful Development for a Proposed Development) (Amended Description)
Proposed conversion of existing dwellinghouse from Class C3 (single family dwellinghouse) to Class C4 (small scale House in Multiple Occupation) with the addition of 1 obscure glazed window in the upper floor side elevation (Application for a Certificate of Lawful Development for a Proposed Development)
Two storey rear extension, first floor side extension, conversion of the garage to habitable use, extension of front porches, alterations to fenestration, conversion and extension of the roof space to habitable use to include raising of ridge, a rear rooflight and dormer, side dormer and rooflight, two front rooflights and Use of property as a large House in Multiple Occupation (10 to 12 residents) (Sui Generis) (Retrospective application)
Conversion of an existing residential dwelling (Use Class C3) into a four-bedroom House in Multiple Occupation (Use Class C4) (Application for a Certificate of Lawful Development for a Proposed Development).
Change of use from Class C3 (Dwellinghouse) to Class C4 (HMO) for up to 6 person, conversion of roof space to habitable use with rear dormer, 1x front roof light, following removal of chimney. (Application for a Certificate of Existing use for an Existing Development).
Change of use from Class C3 (dwellinghouse) to Class C4 (HMO for up to 6 persons), including the conversion of the existing garage into habitable accommodation, a corridor to connect the dwellinghouse to the converted garage, and the erection of a part single part two-storey rear extension, following the demolition of the existing conservatory.
Construction of a part two - part single storey rear extension; together with the conversion of a single family dwellinghouse (Use Class C3) into a six bed person HMO, with a maximum occupancy of six people and associated works.
Change of use from Class C3 (Dwellinghouse) to Class C4 (HMO) for a maximum of 6 persons (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from Use Class C3 (dwellinghouse) to Use Class C4 (House in Multiple Occupation for up to 6 people) (Application for a Certificate of Lawful Development for a Proposed Development).
Validated: 29 Oct 2025(4 months ago)
Click to see the 16 applications older than 6 months ↓
Details pursuant to the discharge of Conditions 4 (Cycle Storage), 5 (EV Parking) and 6 (Waste Storage) of planning permission ref. 57783/APP/2025/866, dated 04-07-2025 (Change of use from Class C3 (Single dwellinghouse) to Sui Generis (Large House in Multiple Occupation))
Change of use from dwellinghouse (Class C3) to small House in Multiple Occupation (Class C4) (Application for a Certificate of Lawful Development for a Proposed use)
Change of use from Class C3 (Dwellinghouse) to Sui Generis (Large House in Multiple Occupation), and conversion of roof space to habitable use to include a rear dormer, 1no. front roof light, and removal of chimney.
Change of use from a 6 person House in Multiple Occupation (Class C4) to a 7 person House in Multiple Occupation (Sui Generis) (Application for a Certificate of Lawful Development for a Proposed Use).
Change of use from a Dwellinghouse (Class C3) to a House in Multiple Occupation (Class C4) (Application for a Certificate of Lawful Development for a Proposed Use).
Change of use from (C3 Use Class) to a small House in Multiple Occupation (HMO) (C4 Use Class) (Application for a Certificate of Lawful Development for a Proposed Development)
Details pursuant to the discharge of Conditions 3 (refuse storage), 4 (cycle storage) and 5 (charging point) of planning permission ref. 70356/APP/2022/2654, dated 28-03-2023 (Change of use from a 6 unit small HMO (Use Class C4) to a 7 unit HMO (Sui Generis) for up to 7 people with amendments to the existing rear extension)
Change of use from residential house (Class C3) to a 4-bed House in Multiple Occupation (HMO) (Class C4) (Application for a Certificate of Lawful Development for a Proposed Use)
Conversion of roof space to habitable use to include rear dormer. Change of use from Class C3 (Dwelling) to Class C4 (Small HMO) (Application for a Certificate of Lawful Development for a Proposed Development)
Erection of a rear dormer and conversion of roof from hip to gable end. Change of use to use from residential property (Class C3) to an 7 bedroom HMO (Sui Generis).
Erection of a single storey extension to the rear, change of use from C3 residential to C4 6 person HMO (Application for a Certificate of Lawful Development for a Proposed Development).
Change of use from a dwellinghouse (Use Class C3) to a House in Multiple Occupation (HMO) (Use Class C4) (Application for a Certificate of Lawful Development for an Existing Development).
Details pursuant to the discharge of Conditions 3 (Construction management plan), 4 (Air quality management plan), 5 (Materials), 7 (Fire strategy), 8 (Refuse and recycling), 9 (Refuse and recycling), 10 (Cycle Storage) and 11 (Secure Door) of planning permission ref. 17076/APP/2022/3201, dated 16-02-2023 (Erection of a single storey upwards extension at second floor level to provide 5 HMO bedrooms and communal living/kitchen/dining space with associated external alterations to the building frontage).
Change of use from Class C3 (Dwellinghouse) to Class C4 (HMO) for a maximum of 6 persons (Application for a Certificate of Lawful Development for a Proposed Development)
Change of use from Class C3 (Dwellinghouse) to Class C4 (Small Scale HMO), along with the erection of a single storey rear extension (Application for a Certificate of Lawful Development for a Proposed Development)
Erection of a single storey side and rear wrap around extension, insertion of window to first floor flank wall, change of use from single family residential to 5 bed 5 person HMO.
Conversion of roof space to habitable use to include a hip to gable roof extension, rear dormer and 3 front roof lights, single storey rear extension and change of use to 5-bedroom 5-person House in Multiple Occupation (HMO) (Part retrospective application).