Basic Housing Units Ordinance
(Cap. 658): Complete Guide

This article unpacks the key provisions of the Basic Housing Units Ordinance (Cap. 658) — commonly known as the "BHU Ordinance" — from a landlord's perspective, covering scope, statutory obligations, the compliance pathway, and penalties. If you only want to know "what should I do," jump directly to Section 4: "Landlord Compliance Pathway."

1. Core Purpose of the Ordinance

The issue popularly known as "subdivided units" has been discussed in Hong Kong for over a decade — subdivided units commonly lack independent toilets, have inadequate fire safety provisions, and have undersized floor areas, and have repeatedly been the source of fatal fires. After years of review, the Government gazetted the Basic Housing Units Ordinance (Cap. 658) on 3 October 2025 and began phased implementation from 1 March 2026, replacing a longstanding regulatory grey area with a statutory recognition scheme.

The Ordinance establishes a certification scheme to ensure minimum standards of living conditions rather than banning subdivided renting outright. The Government has been explicit that an outright ban would worsen housing conditions for lower-income residents — the Ordinance therefore opts for a recognition model, allowing compliant units to continue operating legally as Basic Housing Units.

According to Housing Bureau registration figures, by 25 June 2026 approximately 20,000 building units had completed grace-period registration — about 18% of the Government's estimated 110,000 subdivided units territory-wide. The Government estimates roughly 220,000 residents live in subdivided units, of which nearly 80,000 units are expected to require only minor works to meet the standard. This reflects the Ordinance's underlying policy choice: phase out non-compliant premises gradually through certification, rather than a blanket ban, while preserving a legitimate path for compliant units.

For landlords, the Ordinance also closes a long-standing legal grey area — subdivided renting previously had no clear statutory living standard to follow, and liability in the event of an incident was difficult to establish. Once a unit holds BHU recognition, its compliance status is grounded in law, which also strengthens the landlord's position in the tenancy relationship.

2. Scope of the Ordinance

The Ordinance applies to subdivided units within the following two categories of property:

• Subdivided units within private residential buildings (domestic buildings)
• Subdivided units within the residential portions of composite (mixed-use) buildings

Not applicable to: industrial buildings, commercial buildings, public rental housing (PRH), and Home Ownership Scheme / Green Form Subsidised Home Ownership Scheme flats on which the premium has been fully paid (PRH and HOS have separate governing regimes).

Statutory definition of "subdivided unit": a flat within a domestic building that has been partitioned in a manner not shown in the building's reference plans, resulting in 2 or more compartments, at least 2 of which are designed as separate residential tenancy subjects, and at least 1 of which was created by that partitioning.

A boundary case worth noting: compartments formed on a rooftop, podium, garden, or yard through building works that contravene the Buildings Ordinance (Cap. 123) do not count as "subdivided units" under the BHU Ordinance. In other words, unauthorised rooftop structures fall outside the BHU recognition regime — but they may still constitute offences under the Buildings Ordinance. Landlords should not mistake "outside BHU scope" for "no obligation at all."

Hostels, transitional housing, Light Public Housing units, units let by non-profit organisations for social service purposes, units acquired by the Urban Renewal Authority, hotels and guesthouses, care and attention homes, residential care homes for persons with disabilities, child care centres, drug dependent persons treatment and rehabilitation centres, and units let by registered schools to students are all governed by their own specific ordinances and are expressly excluded from the BHU Ordinance's scope.

Sub-letting through an operator does not change who is regulated. Many subdivided units are in practice operated by a "sub-landlord" — an intermediary who leases the whole flat from the owner and then re-lets subdivided portions to individual tenants. The existence of a sub-letting arrangement does not exempt anyone from the Ordinance: the flat owner remains the statutory party responsible for registration and recognition applications, while the sub-landlord falls within section 8(2)(b) — "a person who lets the principal flat under a head tenancy" — and can equally be held liable. A landlord cannot avoid registration or recognition obligations on the basis that "the unit is managed by a sub-landlord."

3. Landlord's Statutory Obligations

Under the Ordinance, the landlord is the primary responsible party. Even if the unit is sub-let through an operator, the landlord remains responsible for ensuring the unit holds a valid recognition. Specific obligations include:

• Register: Submit a grace-period registration application to the Housing Bureau within the 12-month registration period (1 March 2026 – 28 February 2027), demonstrating the subdivided unit was subject to a residential tenancy at some point during the 3 months ending on the gazettal date (i.e. 4 July 2025 – 3 October 2025). No fee applies during the registration period.
• Obtain recognition: Before the grace period expires (28 February 2030), engage a Specified Professional (a registered architect, registered structural/geotechnical engineer, or a registered professional surveyor in the building surveying division) to carry out an on-site inspection and produce a report confirming the unit meets the minimum standards of living conditions, then apply to the Housing Bureau for BHU recognition on that basis.
• Maintain compliance: Keep the unit compliant with the minimum standards of living conditions throughout the 60-month (5-year) validity period, including inspecting independent fire detectors and fire extinguishers at least once every 12 months, and not allowing later alterations to take the unit out of compliance.
• Renew: Apply for renewal before the 60-month recognition validity period expires (renewal fee: HKD 2,400 per BHU) to avoid a gap in valid recognition.

4. Landlord Compliance Pathway

For the vast majority of landlords, the compliance pathway has just 4 steps — but the quality of execution at each step directly affects the time and cost of the steps that follow:

1. Register (March 2026 – 28 February 2027): Submit a grace-period registration application to the Housing Bureau at no cost, showing only that the unit was let residentially within the specified 3-month window. Registration secures 36 months of grace-period protection, until 28 February 2030.
2. Assess (start as early as possible — do not leave it until the end of the grace period): Have a Specified Professional inspect the unit on site against the 8 minimum standards of living conditions set out in Schedule 1 (floor area, ceiling height, fire safety, load-bearing capacity, independent toilet facilities, water point and sink, lighting and ventilation, water and electricity meters), and provide a written list of required works with an indicative cost range.
3. Renovate (scope and cost vary by unit): Carry out the works identified in the assessment report — for example, installing independent fire detectors, improving ventilation, or adding a bathtub/shower to the toilet. The Government estimates nearly 80% of registered units need only minor works, but individual units (for example with insufficient floor area or unauthorised partitioning) may require more substantial structural changes, or in some cases may not be able to meet the standard at all.
4. Certify (must be completed before the grace period ends on 28 February 2030, though leaving it to the final stage is not advisable): Have the Specified Professional submit the report together with the prescribed fee to apply to the Housing Bureau for BHU recognition. The fee depends on the combination of registration timing and application timing — landlords who register earliest may qualify for a fully waived recognition fee; late applications are charged a flat HKD 3,000 per subdivided unit.

The difference between self-managing the process and engaging a professional team lies in time cost, the accuracy of professional judgement, and efficiency in communicating with the Housing Bureau. We recommend landlords at minimum have a free consultation to understand their unit's actual condition before deciding whether to proceed independently.

5. Consequences of Non-Compliance

Part 2 of the BHU Ordinance (the offence provisions, section 8) takes effect on 1 March 2027. From that date, where 2 or more subdivided units within a flat are let under separate residential tenancies, and the flat has no valid grace-period registration and at least one of those subdivided units has no valid BHU recognition, the person letting the unit, the person letting the principal flat under a head tenancy, and any other person entitled to collect the relevant rent may all be liable.

The Ordinance also provides statutory defences: a landlord may raise a defence by establishing that they did not know, and had no reason to suspect, that the subdivided unit was let in contravention of the Ordinance, or that the contravention could not have been avoided despite reasonable efforts. The burden of proof, however, rests with the landlord — in practice, a defence based solely on "not knowing" is difficult to sustain, and obtaining recognition early remains the only reliable way to avoid liability. It is also worth noting that while the offence provisions only take effect in March 2027, registration and recognition application procedures already began in March 2026 — landlords should not assume "nothing needs to be done before the enforcement date," since the full assessment-renovation-recognition process often takes longer than expected.

6. Respective Responsibilities of Landlord, Tenant, and Operator

The three parties have different responsibilities under the Ordinance:

Although these responsibilities are listed separately, in practice they are often intertwined — for example, when a tenant complains that a unit is being let without valid recognition, the Housing Bureau's investigation typically holds the landlord responsible rather than the operator, because the statutory registration and recognition obligations always rest with the owner of the flat. A private compliance agreement between landlord and operator is a civil arrangement between the two parties; it cannot override the Housing Bureau's or a court's power to hold the landlord accountable under the Ordinance itself.

7. Common Misconceptions

Misconception 1: The "subdivided unit ordinance" and the "BHU Ordinance" are two different laws. "Subdivided unit" (colloquially "sub-divided flat") is the informal, commonly used term; the Basic Housing Units Ordinance (Cap. 658) is the sole statutory name, and industry and media commonly refer to it by the colloquial term as well — both refer to the same piece of legislation. A unit is legally called a "subdivided unit" before it holds recognition, and may only be called a "Basic Housing Unit" once it holds valid BHU recognition.

Misconception 2: Recognition is valid for "5 years," so renewal can wait until year 5. The Ordinance's text specifies the validity period as "the period of 60 months beginning on the date of recognition." 60 months and 5 years are the same length of time, but the Ordinance uses "60 months" as its precise basis for calculation, running from the recognition date (not the application date). We recommend landlords start arranging renewal assessment at least 3 to 6 months before the validity period expires, to avoid a gap in valid recognition during which the unit cannot legally be let. Both misconceptions may look like minor details, but they matter in practice — using the wrong terminology can cause confusion when communicating with a Specified Professional or the Housing Bureau, and can lead landlords to misjudge their own deadlines for action.