Hong Kong's First Certified BHUs: Inside a Sham Shui Po "1-into-3" Conversion at HKD 50,000 Per Unit
- In June 2026, the Housing Bureau issued Hong Kong's first BHU certifications
- A Sham Shui Po "one-into-three" conversion passed at around HKD 50,000 renovation cost per unit
- Key works: FD30 fire door, toilet three-fixture set (flush toilet + washbasin + shower), mechanical ventilation at 5 ACH, and independent utility meters
In June 2026, the Housing Bureau issued Hong Kong's first certifications under the Basic Housing Units Ordinance (Cap. 658), marking the start of formal BHU recognition in the city. These early certified units offer the clearest real-world evidence of what "passing" looks like in practice — what works were required, what the costs came to, and how the certification process unfolded from registration through to the specified professional's site visit.
The Case: A Sham Shui Po One-into-Three Conversion
The property in question was a mid-floor unit in a pre-war tenement building in Sham Shui Po — one of Hong Kong's oldest residential neighbourhoods and a district with a high concentration of subdivided flats. The owner had converted a single larger flat into three separate rental units several years prior to the ordinance coming into effect.
When the Basic Housing Units Ordinance was gazetted, the owner engaged an authorised architect (the "specified professional" under the ordinance) to assess all three units against the Schedule 1 technical standards. The assessment identified several gaps between the existing condition and the certification requirements — all of which were addressed through targeted renovation rather than structural alteration.
The owner submitted the grace-period registration before 31 August 2026, qualifying for the full waiver of the Housing Bureau filing fee. Following completion of the renovation works, the specified professional conducted an on-site inspection of each unit and submitted the required reports to the Housing Bureau. Certifications were issued in June 2026.
What the Renovation Covered — and Why
Each item of renovation work traces directly to a requirement in Schedule 1 of Cap. 658. Understanding why each work was needed clarifies what the Housing Bureau is actually checking during certification.
Floor Area and Ceiling Height
The three units each measured between 9.5 and 11 sq m of internal floor area — comfortably above the Schedule 1, section 1 minimum of 8 sq m (bathroom included). Clear ceiling height throughout all three units exceeded 2.3 m at every point, satisfying section 2. No structural work was required on either dimension.
Fire Safety: FD30 Fire Door
Schedule 1, section 3 requires each BHU's entrance door to be an FD30-rated fire door (30-minute fire resistance). The existing hollow-core timber doors in all three units did not meet this standard. All three were replaced with compliant FD30 steel fire doors, fitted with self-closing mechanisms and correct door seals. Annual fire detector inspection was also set up as required under the same section.
Dedicated Toilet: The Three-Fixture Set
Under Schedule 1, section 5, every BHU must have a private toilet room containing all three of the following fixtures: a flush toilet (水廁), a washbasin (盥洗盆), and either a bathtub or a shower (浴缸或淋浴花灑). All three are mandatory — a unit with only a toilet and washbasin but no shower would fail this standard.
In this case, one of the three units lacked a shower fitting; the other two already had the full set. A shower tray and mixer fitting were installed in the deficient unit's toilet room, completing the three-fixture requirement across all units.
Kitchen Water Point Outside the Toilet
Schedule 1, section 6 requires that the unit's kitchen water point (for food preparation) be located outside the toilet room. In all three units, the cooking area and its water connection were already situated in the main living space, separate from the toilet — so no works were required on this point.
Ventilation: Mechanical at 5 ACH
Schedule 1, section 7 requires each BHU to have adequate ventilation. Where natural ventilation (windows opening to an external air shaft or the outside) does not meet the standard, mechanical ventilation must be installed providing at least 5 air changes per hour (ACH). The three units in this building had no windows of sufficient size opening to external air, so mechanical ventilation fans were installed in each unit's ceiling — rated to meet the 5 ACH standard at each unit's volume.
Independent Utility Meters
Schedule 1, section 8 requires each BHU to have its own independent water meter (from the Water Supplies Department) and its own independent electricity meter (from CLP or HK Electric, as appropriate). Shared or sub-metered arrangements do not satisfy this requirement. In this case, the three units had been operating on a shared electricity supply, with the owner collecting a flat electricity contribution from each tenant. Separate individual meters were applied for from the utility provider and installed before the specified professional's inspection.
Cost Breakdown: How HKD 50,000 Per Unit Was Spent
The total renovation cost across all three units came to approximately HKD 150,000 — averaging HKD 50,000 per unit. The breakdown below reflects the actual scope in this case; costs vary significantly depending on existing conditions.
| Work Item | Cap. 658 Ref. | Cost (3 units) |
|---|---|---|
| FD30 fire door supply & installation (×3) | Sch. 1, s.3 | ~HKD 30,000 |
| Shower installation in 1 deficient toilet room | Sch. 1, s.5 | ~HKD 12,000 |
| Mechanical ventilation fans (×3 units) | Sch. 1, s.7 | ~HKD 30,000 |
| Independent electricity meter application & wiring | Sch. 1, s.8 | ~HKD 24,000 |
| Independent water meter application (WSD) | Sch. 1, s.8 | ~HKD 12,000 |
| Annual fire detector inspection setup | Sch. 1, s.3 | ~HKD 6,000 |
| Specified professional (authorised architect) — site inspection + report (3 units combined) | s.17(2) | ~HKD 15,000–25,000 |
| Housing Bureau filing fee | Sch. 2 | HKD 0 (early-bird waiver) |
Note on the Housing Bureau filing fee: landlords who submitted their grace-period registration between 1 March and 31 August 2026 (the first six months of the grace period) and apply for certification before 1 March 2029 are entitled to a full fee waiver — HKD 0 per unit. The standard certification fee is HKD 3,000 per unit. Grace-period registration itself is also free (HKD 0) for all registrations submitted before 28 February 2027.
Note on cost variability
The HKD 50,000 per unit figure applies specifically to this case, where partition walls, ceiling heights, and floor areas were already compliant. Units requiring structural partition changes, toilet room construction from scratch, or piped drainage runs will cost significantly more. Always commission an on-site assessment from a specified professional before budgeting.
3 Practical Lessons for Other Landlords
The toilet three-fixture rule catches more landlords than any other standard
Many subdivided units have a toilet and washbasin but no shower or bathtub. Under Schedule 1, section 5 of Cap. 658, all three fixtures are mandatory. This is one of the most frequently failed standards in pre-certification assessments — and one of the cheapest to fix when caught early. A shower installation in an existing toilet room typically costs HKD 8,000–18,000 depending on drainage access.
The early-bird fee waiver makes registering before 31 August 2026 financially significant
Across three units, the grace-period fee waiver saves HKD 9,000 in Housing Bureau filing fees (3 × HKD 3,000). For landlords with larger portfolios, the saving scales proportionally. The waiver requires both registration before 31 August 2026 and certification application before 1 March 2029 — neither condition alone is sufficient.
The specified professional's site inspection cannot be replaced by remote or document-based review
Under section 17(2) of Cap. 658, the report submitted by the specified professional must be based on an actual site inspection of the unit. Floor plans, photographs, or video calls do not satisfy this requirement. Budget for on-site professional time from the outset — typically HKD 5,000–10,000 per unit for the inspection and written report, sometimes lower when multiple units in the same building are assessed together.
⚠️ Enforcement Timeline and Penalties
Under the Basic Housing Units Ordinance (Cap. 658), from 1 March 2027, non-compliant landlords face fines up to HKD 300,000 + 3 years' imprisonment under indictable procedure, plus HKD 20,000 for each continuing day of offence. Under summary procedure, a level 6 fine and up to 2 years' imprisonment apply. Grace-period registration closes 28 February 2027 — units still in operation after this date without a valid certification or pending registration will be treated as non-compliant.
Frequently Asked Questions
When were Hong Kong's first BHU certifications issued?
In June 2026, the Housing Bureau issued Hong Kong's first batch of Basic Housing Unit (BHU) certifications. The first certified cases were units that had registered early and completed all required renovation works before the inspection.
Why was the renovation cost only around HKD 50,000 per unit in the Sham Shui Po case?
The cost depends on the existing condition of the flat. In this case, the original units had relatively basic toilet facilities and partition walls in place. Key renovation focused on FD30 fire doors, upgrading the toilet to the three-fixture set (flush toilet, washbasin and shower), mechanical ventilation, and independent water and electricity meters — keeping unit costs within the HKD 50,000 range.
What are the three required toilet fixtures under the BHU ordinance?
Under the Basic Housing Units Ordinance (Cap. 658) Schedule 1, section 5, every subdivided unit's toilet must contain: (a) a flush toilet, (b) a washbasin, and (c) a bathtub or shower. All three are mandatory — any missing fixture will cause the application to fail.
Must the specified professional conduct a physical site inspection?
Yes. Under section 17(2) of the Basic Housing Units Ordinance (Cap. 658), the report submitted by the specified professional must be based on an actual site inspection of the unit. Remote assessment based on documents or photographs alone does not satisfy this requirement.
What is the Housing Bureau filing fee for BHU certification?
The fee depends on when you registered and when you apply for certification. Landlords who submitted their grace-period registration between 1 March and 31 August 2026 (first six months) and apply for certification before 1 March 2029 pay HKD 0 — a full waiver. The standard fee is HKD 3,000 per unit. Grace-period registration itself is free (HKD 0) until 28 February 2027.