Owl Square Group has operated Hong Kong subdivided flat properties since 2018. Over 8 years we have managed 500+ units across 40+ locations in Hong Kong and Kowloon. We have handled compliance issues relating to units of almost every structure type, age, and landlord situation imaginable.
After the BHU legislation took effect in 2026, we began engaging with large numbers of landlords facing compliance for the first time. In this process, we observed certain repeatedly occurring misconceptions — not isolated judgment errors by individual landlords, but widespread blind spots prevalent across the market.
This article sets out the 5 most common misconceptions we have seen and explains why they end up doubling landlords' compliance costs.
Misconception 1: "Wait for Other Landlords to Go First and See How It Works"
The Landlord's Real Thinking
Many landlords' first reaction to the legislation is to "wait and see". Their logic typically runs as follows:
- I'm not sure how vigorously the government will enforce — let me watch first
- Once others have gone through it, I'll know what the costs look like
- The grace period runs until 2030 — there's no rush right now
This thinking is understandable, but it is expensive to act on.
Why This Misconception Is Costly
BHU compliance involves three key resources, all of which tighten as enforcement day approaches:
Authorized Persons (Specified Professionals)
The number of registered architects, registered professional engineers, and registered professional surveyors in Hong Kong is finite. BHU certification requires them to conduct in-person surveys and sign certification reports. When tens of thousands of landlords are competing for their services simultaneously, wait times for appointments will stretch from the current "2–3 weeks" to "3–6 months".
Renovation Contractors
Compliance renovation involves plumbing, electrical, fire protection, and mechanical ventilation works. Contractors in these trades will be oversubscribed from the second half of 2026 through the first half of 2027. We have already observed some contractors with construction schedules booked out to Q3 2027.
Buildings Department Approval Queue
The BD's BHU Regulation Division has limited staffing. The approval queue is expected to peak in the 6–12 months before enforcement day. Approvals that currently take 8–12 weeks may stretch to 16–24 weeks.
The Real Cost of Waiting
Among landlords we have served, a 6-month difference in start time typically results in a 20–40% difference in total cost. The reasons:
- Authorized Person service fees rise when supply and demand are imbalanced
- Contractors increase prices or refuse smaller jobs
- Extended BD supplementary submission handling indirectly increases landlord management costs
The more hidden cost: if the situation drags until the grace period ends in 2030, the landlord loses all legal protection entirely — every day of continued letting is illegal.
Our Recommendation
You do not need to launch the full compliance process immediately, but at least complete an assessment first. A written assessment report costing HKD 3,000 will tell you:
- The actual condition of your unit
- The renovation scope and cost range
- A realistic timeline
Armed with this report, you can enter the full service at the right moment and avoid the peak period.
Misconception 2: "I'll Just Find a Friend Who's an Architect to Sign Off"
The Landlord's Real Thinking
Some landlords think: "It's just a matter of getting an architect to sign something, isn't it? I have a distant relative who's an architect — I'll ask him to sign it off at a reduced rate."
Why This Misconception Is Costly
The certification process for BHU is considerably more complex than landlords imagine:
Certification Involves Multiple Professional Disciplines
Under the Regulation, Authorized Persons include registered architects, registered professional engineers (building, civil, structural, fire, building services), and registered professional surveyors (building surveying category). Different professionals cover different aspects of the certification scope.
For example:
- Structural assessment: requires a structural engineer
- Mechanical ventilation assessment: requires a mechanical engineer
- Fire safety certification: requires a fire engineer or building surveyor
- Overall certification report: typically coordinated by a building surveyor
The landlord's "architect friend" may only be able to cover one component.
Certification Requires In-Person Inspection and Written Documentation
Under the BHU Code of Practice, the Authorized Person must conduct an "in-person inspection" and "prepare the report within 14 calendar days". This is not a signing act — it is a professional responsibility.
If an Authorized Person signs a certification without conducting a thorough inspection, they may be in breach of professional conduct rules and face disciplinary proceedings. Any responsible professional will decline to do this, unless the landlord can persuade them to accept the risk — which typically means paying a "personal favour fee" well above the market rate.
The Consequences of a Defective Certification Fall on the Landlord
If the content of the Authorized Person's certification does not match the unit's actual condition and this is discovered in a BD spot check, the certification may be revoked. The landlord must reapply and may face fraud allegations.
Our Recommendation
Engage a service provider with established experience in BHU compliance and a stable working relationship with an Authorized Person team. The HKIS-published starting fee for 3–4 subdivided flats is approximately HKD 15,000 — this is a reasonable market rate; do not try to compress it significantly.
Misconception 3: "Just Get the Certification — No Renovation Needed"
The Landlord's Real Thinking
"My unit has been subdivided and let for years with no problems. Certification is just a paperwork exercise — there's no need for any construction work."
Why This Misconception Is Costly
Many existing subdivided flats genuinely require only limited renovation, but virtually no unit requires absolutely no work at all.
The BHU minimum living space standards include the following requirements:
- Minimum floor area of 8 m² (approximately 86 sq ft)
- Ceiling height of at least 2.3 m
- Independent bathroom with water supply point
- Mandatory installation of separate water and electricity meters
- Certain fire safety installations (fire door, smoke detector, fire extinguisher)
- Adequate ventilation (natural or mechanical)
Among the units we have served, the most frequently required renovation items are:
Separate Utility Metering
Many older subdivided flat arrangements operate on a "shared meter" basis (the landlord pays the aggregate and tenants share the cost). This does not meet certification requirements; separate water and electricity meters must be applied for. This process involves applications to the Water Supplies Department and the electricity company, plus installation works, and typically takes 4–8 weeks.
Fire Safety Upgrades
Subdivided flats fitted out before 2010 rarely meet current fire safety standards. The most common required works: fire-rated smoke doors (with 1-hour fire and smoke resistance certification), smoke detectors (with Fire Services Department Form FS251 application), and fire extinguishers.
Ventilation
Some interior rooms (without windows) require mechanical ventilation to be installed. Even for rooms with windows, some older buildings' window openings do not meet the required ratio and may need adjustment.
The Housing Bureau's Official Estimate
It is worth noting that the Housing Bureau has estimated "approximately 70% of existing subdivided flats require only minor renovation or no major renovation". While this figure appears optimistic, "minor renovation" still represents a real cost to landlords — typically in the range of HKD 30,000–80,000.
Only approximately 5–10% of units require no renovation whatsoever.
Our Recommendation
Landlords should not assume their unit is one of the rare exceptions that requires no work at all. Complete an assessment first to understand the actual renovation scope required, and then make an informed decision.
Misconception 4: "Compliance Costs Too Much — Easier to Exit the Market"
The Landlord's Real Thinking
Some landlords react strongly when they hear compliance costs: "Just the certification and renovation could run to over HKD 100,000? I'd rather stop letting altogether!"
Why This Misconception Is Costly
We agree that compliance costs are real. However, landlords making an exit decision typically underestimate the "hidden cost of non-compliance".
Rental Income Gap: Whole-Unit vs Subdivided Letting
A typical scenario in core Hong Kong districts:
- A 600 sq ft residential unit subdivided into 4 rooms: total monthly rental income may reach HKD 30,000
- The same unit let as a whole: monthly rent typically HKD 15,000–20,000
- Monthly income gap: HKD 10,000–15,000
If compliance costs HKD 100,000, the landlord typically recovers the investment from the incremental rental income within 7–10 months. Over the full 5-year certification period, the remainder is all net gain.
Hidden Costs of Selling
If the landlord chooses to sell and exit:
- Agent commission approximately 1% (typically paid by the buyer, but reflected in the transaction price)
- Legal fees HKD 10,000–30,000
- Loss of future rental cash flow
At an annual rental income of HKD 360,000, the 10-year cash flow (without accounting for rental growth) is HKD 3.6 million. Even discounted, this far exceeds compliance costs.
Our Recommendation
The decision to exit should not be based on the instinct that "compliance costs a lot in one go", but on a complete financial calculation. Our written assessment reports include cost range estimates and payback period calculations to help landlords make a fact-based decision.
Exit is only genuinely rational in a small number of situations:
- The unit structure is severely deteriorated and renovation costs exceed a reasonable payback period
- The OC or DMC prohibits renovation and cannot be negotiated around
- The landlord was already planning to sell the property in the near term
Misconception 5: "Just Go With the Cheapest Service Provider"
The Landlord's Real Thinking
A landlord compares quotes from several service providers, finds significant price variation, and naturally gravitates towards the cheapest. "It's the same work being done — isn't cheaper better?"
Why This Misconception Is Costly
Price differences between BHU compliance service providers are usually not "pure price competition for identical quality" — they reflect substantive differences in scope of service:
What Cheaper Providers May Cut
- Simplified or absent written assessment reports
- Lower-grade construction materials (e.g. cheap fire doors without a 1-hour fire and smoke resistance certificate)
- Authorized Person certification conducted to a "bare minimum" standard (higher risk)
- BD communication and supplementary submission handling left to the landlord
These Omissions Surface After Enforcement
Real situations we have seen (de-identified to protect landlord privacy):
- Landlord uses a cheap service provider to obtain certification; BD spot check reveals fire doors do not meet the required standard; certification revoked
- Landlord must replace fire doors with compliant units and reapply for certification
- Total cost ends up higher than if the landlord had engaged a proper service provider at the outset
The Money Saved Is Often "Cost That Should Have Been Spent"
The true cost of BHU compliance is essentially fixed:
- Authorized Person professional time (cannot be compressed)
- Compliant construction materials (cannot be downgraded without breach)
- Official BD fee (HKD 3,000 per subdivided flat)
- Labour cost (market rate)
Any quote significantly below market price means someone is subsidising some element — which is usually not the provider's goodwill, but a compromise on quality.
Our Recommendation
When comparing service providers, do not look at the total price alone — compare:
- The level of detail in the written assessment report (transparent providers clearly itemise each renovation requirement in the report)
- The professional credentials of the Authorized Person team (registered and in good standing; track record of past work)
- Specification of construction materials (whether they meet official certification requirements)
- Clarity of the service agreement (what is included, what is excluded, scope of warranty)
- Years in operation (avoid newly established providers without a track record)
Choosing a reputable provider at the mid-market price point is typically the safest decision.
Conclusion: Approach Compliance Honestly
Eight years of property management experience has shown us: BHU compliance is not a burden on landlords — it is asset protection. But only if landlords approach it the right way.
At their core, all 5 misconceptions we have observed stem from the same problem: landlords underestimate the complexity of compliance and try to simplify or avoid it. But the complexity is objectively real — legislation, technical standards, government process, and market supply all remain complex regardless of how simple a landlord wishes they were.
The genuine path to cost reduction is not "finding shortcuts" — it is "starting early, engaging the right people, and following the complete process".
This is also the message Owl Standard wants to share with all landlords: slow is fast — investing a little more time in assessment and planning ultimately delivers the lowest total cost.
References
- Buildings Department — Official BHU Regulation Website
- Hong Kong Institute of Surveyors — Statement on the BHU Regulation, March 2026
- Housing Bureau — BHU Policy Information