The Gap Between Code and Reality
BNBC 2020 is a technically sound building code, substantially aligned with international standards. However, the gap between what BNBC requires and what is actually built in Bangladesh is significant. Understanding this gap is essential for any professional evaluating, leasing, or managing buildings in Bangladesh.
This is not about criticising Bangladesh construction — it's about equipping professionals with the knowledge to assess what they're actually getting, manage risks, and make informed decisions.
What You Typically Find in Dhaka
Concrete cover to reinforcement varies 40-80mm with inconsistent application
No fire compartmentation between floors in most pre-2015 buildings
Mixed electrical wiring standards (IEC/BS) without proper RCCB/RCD protection
No mechanical ventilation in most commercial buildings below Grade A
Stairwell widths often below minimum; single staircase in many multi-storey buildings
What BNBC 2020 Requires
Minimum 25-50mm concrete cover per exposure class with consistent quality control
Fire-rated compartmentation (minimum 2-hour rating) between floors and unit separations
IEC-compliant electrical installation with RCCB/RCD at distribution boards and proper earthing
Mechanical ventilation meeting BNBC Part 8 minimum air change rates for each occupancy type
Minimum two staircases for buildings above 3 floors with code-compliant width and fire rating
Structural Quality — What You Find
| BNBC Requires | Common Reality | Frequency | Risk |
|---|---|---|---|
| Concrete min 25 MPa (structural) | Actual strength 15-20 MPa common in older buildings. Manual mixing, inconsistent water-cement ratio. | Very common in pre-2010 | High |
| Proper curing — 7 days minimum | Curing often limited to 1-3 days. Bangladesh heat accelerates moisture loss. | Common | High |
| Specified rebar — correct grade, lap length | Substitution of lower grade rebar. Short lap lengths. Missing stirrups in beam-column joints. | Common in non-engineered | High |
| Adequate cover — 40-50mm | Cover often 15-25mm — corrosion starts within 5-10 years in Bangladesh climate. | Very common | Medium-High |
| Foundation per soil investigation | Soil investigation done for large projects. Small-medium buildings often skip it. | Common for smaller buildings | Medium-High |
| No unauthorised modifications | Extra floors added, columns cut for parking, load-bearing walls removed. | Common in residential | High |
Fire Protection — What You Find
| BNBC Requires | Common Reality | Frequency | Risk |
|---|---|---|---|
| Fire-rated stairwell enclosure | Open staircases common. No fire doors. Stairs used for storage. | Very common | High |
| Sprinkler system (high-rise, large commercial) | Absent in majority of buildings, including many high-rise. | Very common | High |
| Fire alarm system (commercial) | Many buildings have no alarm. Some have non-functional systems. | Common | High |
| Minimum 2 exit stairs per floor | Single staircase common. Second stair often locked or blocked. | Common | High |
| Fire resistance ratings (FRR) | Never verified in existing buildings. Fire stopping absent at penetrations. | Universal | Medium-High |
| Emergency lighting | Absent in most buildings. Some have non-functional battery units. | Common | Medium |
Electrical Quality — What You Find
| BNBC Requires | Common Reality | Frequency | Risk |
|---|---|---|---|
| IEC 60364 compliant installation | Installation quality ranges from excellent to dangerous within the same building. | Common | High |
| Adequate earthing (≤5Ω) | Earthing often >10Ω or non-functional. Earth pits dry out in dry season. | Very common | High |
| MCB/RCCB protection | Main panel may have MCBs but sub-distribution often unprotected or incorrectly rated. | Common | Medium-High |
| Proper cable sizing and routing | Overloaded circuits, cables running through walls without conduit, junction boxes exposed. | Common | Medium-High |
| Generator ATS with testing | Generator common but ATS testing rare. Transfer time untested. | Common | Medium |
Mechanical Systems — What You Find
| BNBC Requires | Common Reality | Frequency | Risk |
|---|---|---|---|
| Mechanical ventilation per ASHRAE 62.1 | Most buildings rely on split AC with no fresh air intake. Ventilation is recirculated only. | Very common | Medium |
| Lift per EN 81 / ASME A17.1 | Lifts installed but maintenance quality varies. Annual BSEC inspection often perfunctory. | Common | Medium |
| Plumbing per code | Plumbing generally functional but cross-connection risks, no backflow prevention. | Common | Low-Medium |
Building Grade Assessment — What to Expect in Dhaka
| Building Grade | Description | Typical BNBC Compliance | % of Dhaka Stock | Typical Occupants |
|---|---|---|---|---|
| Grade A | Purpose-built commercial, post-2015, named developer | 60-80% — structural and fire better, energy and accessibility gaps | ~5% | MNCs, banks, embassies |
| Grade B | Commercial, 2000-2015, reasonable construction | 40-60% — structural OK, fire protection gaps | ~15% | Large local corporates, some MNCs |
| Grade C | Mixed-use or converted residential, pre-2000 | 20-40% — significant gaps across all systems | ~30% | SMEs, local businesses |
| Grade D | Non-engineered, residential converted to commercial | <20% — fundamental structural and safety concerns | ~50% | Small businesses, garment subcontractors |
Where Bangladesh Construction Excels
- New Grade A buildings — purpose-built commercial buildings by established developers (e.g., Bashundhara, Summit, Navana) generally have good structural design and reasonable MEP systems.
- Garment export sector — post-Rana Plaza, Accord/Alliance-assessed factories have significantly improved structural and fire safety standards.
- Foundation engineering — for large buildings, soil investigation and pile foundation design are generally well-executed.
- Concrete technology — ready-mix concrete from established plants (e.g., Concord, Mir Concrete) provides consistent quality.
How to Assess an Existing Building
- Document review — ask for RAJUK approval, structural drawings, fire licence, electrical layout. What's missing tells a story.
- Visual structural walk — look for cracks (diagonal = shear, horizontal = settlement), spalling, exposed rebar, water staining.
- Fire safety walk — check exit stairs (open or enclosed? doors? lighting?), fire alarm (exists? functional?), sprinklers (exists?), extinguishers (serviced?).
- Electrical check — panel condition, earthing test (request readings), generator test run, cable routing.
- Commission assessments — for anything above a small office, commission: structural PE (RVS minimum), fire risk assessment, electrical safety audit.
References
- BNBC 2020 — Bangladesh National Building Code
- ACI 318 — Structural Concrete
- NFPA Standards
- IEC 60364 — Electrical Installations
- Post-Rana Plaza Accord/Alliance Assessment Reports
- RAJUK — Capital Development Authority
Insights & Guidance
- BNBC 2020 is technically sound — the gap is between code requirements and construction reality.
- Structural: concrete strength often 15-20 MPa vs required 25 MPa in older buildings. Inadequate cover leads to early corrosion.
- Fire: ~70-80% of commercial buildings lack fire alarm systems. Sprinklers absent in most high-rise buildings.
- Electrical: earthing commonly fails the ≤5Ω requirement. Installation quality varies enormously.
- Only ~5% of Dhaka building stock qualifies as Grade A with 60-80% BNBC compliance.
- Post-Rana Plaza reforms significantly improved garment sector construction — but improvements haven't spread to general commercial stock.
Every building professional operating in Bangladesh needs an honest understanding of what they're likely to find. This isn't about criticism — it's about informed decision-making, risk management, and knowing where to focus due diligence efforts.
- Assumed quality — taking "engineered" at face value without verification.
- Hidden modifications — extra floors or removed walls that compromise structural integrity.
- Electrical fires — poor wiring and earthing are a leading cause of building fires in Dhaka.
- RAJUK building approval and as-built drawings
- Concrete test reports (cube/cylinder strength at 28 days)
- Fire licence from FSCD
- Electrical installation test certificate
- Concrete condition — cracking, spalling, exposed rebar?
- Fire stairs — enclosed, clear, fire doors, emergency lighting?
- Electrical panels — neat, labelled, no exposed wiring?
- When was this building constructed? To which code edition?
- Have any floors been added since original construction?
- When was the last structural assessment?
- Is the fire alarm system functional and tested?
- Any building above 4 storeys for pre-lease DD — structural engineer for RVS.
- Any building for MNC occupancy — fire protection consultant for FRA.
- Electrical safety — certified electrical engineer for safety audit.