What Building Accessibility Means
Building accessibility ensures that people of all abilities — including those with mobility impairments, visual or hearing impairments, cognitive disabilities, and temporary injuries — can enter, navigate, use, and evacuate a building independently and with dignity. It is both a legal requirement in most jurisdictions and an ESG Social responsibility.
Applicable Standards
| Standard | Scope | Publisher |
|---|---|---|
| ADA Standards | Accessibility requirements for public and commercial buildings (USA) | US DOJ |
| ISO 21542 | Building construction — accessibility and usability of the built environment | ISO |
| UN CRPD | Convention on the Rights of Persons with Disabilities (Article 9: Accessibility) | United Nations |
| BNBC 2020 Chapter 3.10 | Requirements for physically disabled persons | HBRI, Bangladesh |
| WELL v2 | Movement concept — universal design and accessibility | IWBI |
Key Accessibility Requirements
| Element | Standard Requirement | Good Practice |
|---|---|---|
| Building entrance | At least one accessible entrance at grade or with ramp (max 1:12 slope) | Main entrance is accessible; automatic doors |
| Corridors | ≥ 1,200 mm clear width | 1,500 mm+ for two wheelchair passing |
| Doors | ≥ 900 mm clear opening; lever handles; ≤ 22 N opening force | Automatic doors at main circulation points |
| Lifts | ≥ 1 accessible lift per lift bank; 1,100 × 1,400 mm car minimum | All lifts accessible; audible floor announcements; Braille buttons |
| Ramps | Max 1:12 slope; 1,200 mm wide; handrails both sides; level landings every 9 m | 1:20 slope preferred; tactile warnings at top/bottom |
| Toilets | ≥ 1 accessible toilet per floor; 1,500 × 1,500 mm clear turning circle | Accessible toilets on every floor; gender-neutral option |
| Wayfinding | Tactile floor indicators; Braille signage; high-contrast signs | Multi-sensory wayfinding; digital directories at accessible height |
| Parking | 2% of spaces accessible; located nearest to entrance | 5% accessible; van-accessible spaces; EV charging at accessible spots |
| Emergency egress | Refuge areas on each floor above ground; visual alarms + audible alarms | Evacuation chairs; personal emergency evacuation plans (PEEPs) |
Bangladesh Context
- BNBC 2020 Chapter 3.10: Requires accessible provisions including ramps, accessible toilets, and lift access. Compliance is mandatory for new construction but enforcement is limited.
- Persons with Disabilities Rights and Protection Act, 2013: Guarantees right to accessible public buildings and transportation. Implementation gap remains significant.
- Reality: Most existing commercial buildings in Dhaka have limited accessibility. Steps at entrances, no accessible toilets, small lifts, and absent wayfinding are common.
- MNC requirement: Multinational tenants (especially from EU, US, UK headquarters) require accessibility compliance regardless of local enforcement levels.
- Cost of retrofit: Adding accessibility features post-construction costs 3-5× more than designing them in. However, many improvements (lever handles, signage, ramp additions) are relatively low-cost.
References
- ADA Standards for Accessible Design
- ISO 21542 — Accessibility and Usability of the Built Environment
- UN Convention on the Rights of Persons with Disabilities (CRPD)
- WELL Building Standard v2 — Movement Concept
- BNBC 2020 — Chapter 3.10: Requirements for Physically Disabled Persons
Insights & Guidance
- Building accessibility is both a legal requirement and ESG Social responsibility — it affects people with permanent, temporary, and situational disabilities.
- Key requirements: accessible entrance (ramp 1:12 max), 900mm+ door clear width, accessible lift and toilet on every floor, tactile wayfinding.
- BNBC 2020 Chapter 3.10 requires accessibility for new buildings in Bangladesh — enforcement is limited.
- MNC tenants from EU/US/UK require accessibility regardless of local enforcement.
- Retrofit is 3-5× more expensive than designing accessibility in — but many improvements are low-cost.
15% of the global population lives with a disability (WHO). Accessibility is a human rights obligation under the UN CRPD, a legal requirement in most countries, and a WELL/LEED credit category. For corporate tenants, inaccessible buildings create legal liability, limit talent pools, and contradict DEI commitments. In Bangladesh, the Persons with Disabilities Act 2013 mandates accessible buildings — the enforcement gap does not eliminate the legal obligation.
- Legal liability — discrimination claims from employees or visitors unable to access building or facilities.
- Talent exclusion — inaccessible offices prevent hiring or retaining people with disabilities.
- Emergency evacuation failure — no refuge areas or evacuation chairs means wheelchair users are stranded during fire.
- Tenant rejection — MNCs walk away from buildings that fail accessibility audits.
- Accessibility audit report — professional assessment against ISO 21542 or ADA standards
- Building plans showing accessible routes, toilet locations, refuge areas
- PEEP (Personal Emergency Evacuation Plan) procedures
- Maintenance records for accessible features (lifts, automatic doors, ramps)
- Can you enter the building in a wheelchair? Is the main entrance accessible?
- Are there accessible toilets on every occupied floor?
- Do lifts have Braille buttons and audible announcements?
- Are corridors wide enough for wheelchair passage?
- Is there tactile paving at stairs and pedestrian crossings?
- Are emergency exits accessible? Are refuge areas marked?
- Has an accessibility audit been conducted?
- Are accessible toilets available on every floor?
- What provisions exist for emergency evacuation of people with disabilities?
- Do lifts meet accessible dimensions (1,100 × 1,400 mm minimum)?
- Is there a plan to improve accessibility of existing deficiencies?
- Accessibility audit — certified access consultant for comprehensive assessment.
- Retrofit design — architect with accessible design experience for cost-effective improvements.
- WELL certification — WELL AP for Movement concept requirements.