5 Surprising Findings from the BHU Registration Register
Under the Basic Housing Units Ordinance (Cap. 658), the Housing Bureau maintains a public register of all grace-period registrations. Since opening in March 2026, the register has accumulated data that reveals patterns the industry didn't fully anticipate — from district concentration to owner-profile anomalies.
- Over 70,000 units registered as of August 2026, but an estimated 40,000 remain unregistered — the single biggest source of future enforcement risk.
- Registration was heavily front-loaded: the highest activity occurred in March–August 2026 when the early-bird $0 certification fee window was open.
- Kowloon's older districts dominate the register, while many New Territories landlords appear not yet to have acted.
BHU Register Key Figures
| Metric | Figure | Note |
|---|---|---|
| Grace-period registrations | 70,000+ | Housing Bureau published figure, August 2026 |
| Estimated citywide SDUs | ~110,000 | Government estimate |
| Estimated registration gap | ~40,000 | Unregistered; facing enforcement risk |
| Registration deadline | 28 February 2027 | Late fee rises to HKD 745 per flat |
Sources: Housing Bureau; Basic Housing Units Ordinance (Cap. 658), Part 3 and Schedule 2
Finding 1: Kowloon's Old Districts Account for a Disproportionate Share
Mapping register entries by district shows that Sham Shui Po, Kwun Tong, and Mong Kok — the three traditional high-density subdivided-flat areas — account for a share of total registrations well above their population share. This broadly matches industry expectations about where subdivided units are concentrated, but the degree of concentration exceeds earlier estimates.
New Territories districts — including Yuen Long, Tuen Mun, and the Northern District — show markedly lower registration density relative to their estimated subdivided-unit stock. This almost certainly reflects variation in landlord awareness rather than actual unit numbers: the landlord population in newer or peri-urban areas appears to have acted later and more slowly than their inner-Kowloon counterparts.
Implication for landlords
A higher proportion of unregistered units in the New Territories is not a reason to wait — enforcement under Cap. 658 is citywide, and the 28 February 2027 registration deadline applies equally to all landlords.
Finding 2: Multi-Unit Landlords Make Up a Higher Share Than Expected
The register shows that a substantial proportion of registered addresses have multiple subdivided units registered at the same flat or building. This means landlords who own more than one subdivided unit in a single property are more prevalent in the market than earlier estimates suggested.
For these owners, certification involves strategic sequencing decisions that a single-unit landlord never faces: whether to batch certification applications, how to schedule renovation work across units, and whether a single specified professional can inspect all units in one visit to reduce cost. The register's data quantifies this group in a way that wasn't previously possible, with real implications for both policy planning and service demand.
Further reading
For certification sequencing strategies for multi-unit landlords, see: Multiple Subdivided Units in One Property: BHU Certification Strategy
Finding 3: Registration Was Heavily Front-Loaded
Analysing the timing of entries in the register reveals a clear front-loading pattern: registration activity was substantially higher in March through August 2026 than in the months that followed. This timing coincides precisely with the early-bird fee window — landlords who registered in those first six months locked in a $0 certification application fee for any recognition filed before 28 February 2029.
From September 2026 onward, the pace of new registrations slowed noticeably. This suggests that landlords most attuned to compliance acted early; those still waiting may underestimate both the time pressure (fewer than five months to the 28 February 2027 cut-off as of September 2026) and the cost implication of the narrower fee-waiver window that applies to later registrants.
⚠️ Time pressure
The March–August 2026 $0 early-bird window is closed. Landlords who register now (September 2026 onward) have a free-application period only until 29 February 2028; from 1 March 2028 to 28 February 2029, the fee is HKD 1,500 per subdivided unit; from 1 March 2029, it rises to HKD 3,000.
Finding 4: Partial-Registration Patterns Appear Within Single Buildings
One of the more unexpected register patterns is the frequency of buildings where some, but not all, subdivided units are registered. Within a single property, the compliance awareness and action speed of different landlords can diverge substantially.
This partial-registration pattern is more pronounced in older walk-up tenements without a building management company, compared to properties with an Owners' Corporation or a managing agent involved. For individual landlords, the fact that a neighbour has not yet registered does not reduce their own legal exposure — under section 8(1), liability under Cap. 658 is assessed per subdivided unit, not per building.
Finding 5: A 40,000-Unit Gap Remains the Primary Enforcement Risk
The most consequential register finding is the persistent gap between the number of registered units and the estimated total stock. With over 70,000 registered as of August 2026 against a government estimate of roughly 110,000 subdivided units citywide, approximately 40,000 units remain unregistered.
Landlords with unregistered units face the following from 1 March 2027, when section 8 of the Ordinance commences:
- Conviction on indictment: fine of HKD 300,000 + up to 3 years' imprisonment
- Summary conviction: level 6 fine + up to 2 years' imprisonment
- In either case: a further fine of HKD 20,000 for each day the offence continues (section 8(3))
The register's public nature also makes targeted enforcement more straightforward: the Housing Bureau can cross-reference the register against its estimates to identify unregistered buildings by address, rather than relying solely on complaints or inspections. Those 40,000 unregistered units are the primary source of enforcement pressure in the months ahead.
⚠️ Important distinction
Grace-period registration and BHU recognition (certification) are two separate legal steps. Completing registration only gains a landlord the grace period running to 28 February 2030. Recognition still requires a report from a specified professional based on an on-site inspection confirming compliance with all Schedule 1 minimum living-conditions standards before the unit can be called a "basic housing unit."
Frequently Asked Questions
What is the BHU registration register?
The registration register is the public record kept by the Housing Bureau under Part 3 of the Basic Housing Units Ordinance (Cap. 658). It lists all flats that have completed grace-period registration. Anyone can search the register by property address to verify whether a flat has registered. Registration and BHU recognition (certification) are two separate processes — registration gives landlords the grace period; it does not mean the subdivided unit has been recognised as a basic housing unit.
How can landlords and tenants search the register?
The Housing Bureau's website (bhu.gov.hk) provides a searchable register. Enter the property address to see whether it has been registered, along with the registration number and the period for which the registration remains valid.
Does being in the register mean a unit is already BHU-certified?
No. Grace-period registration is the first step: it gives landlords until 28 February 2030 to obtain BHU recognition. Recognition requires a report from a specified professional — a registered architect, registered professional engineer (building / building services / civil / fire / structural), or registered professional surveyor (building surveying division) — who must conduct an on-site inspection and certify that the unit meets all Schedule 1 minimum living-conditions standards before the Housing Bureau grants recognition.
How many units had registered as of August 2026?
The Housing Bureau reported that over 70,000 subdivided units had completed grace-period registration as of August 2026. The government estimates approximately 110,000 subdivided units exist citywide, implying a registration gap of roughly 40,000 units that have yet to register.
What happens if landlords miss the 28 February 2027 deadline?
Under section 8 of the Ordinance, from 1 March 2027, letting an unregistered and unrecognised subdivided unit is a criminal offence. On conviction on indictment: a fine of HKD 300,000 and up to 3 years' imprisonment. On summary conviction: a level 6 fine and up to 2 years' imprisonment. In either case, a further fine of HKD 20,000 for each day the offence continues (section 8(3)). The Secretary for Housing may postpone the 1 March 2027 commencement date by gazette notice (section 1(4)); unless that happens, any subdivided unit that is still unregistered and unrecognised from that date is exposed to the section 8 offence.