Accessible housing requirements in the United States vary by federal law, state codes, and local ordinances. This article explains how many accessible units are typically required in multifamily buildings, what drives the count, and how developers can plan to meet the standards while maintaining practical, livable designs for all residents.
Key terms you will see include the Fair Housing Act (FHA) Accessibility Guidelines, the Americans with Disabilities Act (ADA) as it applies to common areas, and state or local amendments that may increase the baseline requirements. Although the exact number can differ, understanding the main rules helps builders and property owners plan for compliant, inclusive housing from the outset.
Understanding Federal Requirements
Federal accessibility rules generally come from the Fair Housing Act (FHA) Accessibility Guidelines. These guidelines apply to covered multifamily dwellings built with federal funding or located in jurisdictions that follow FHA standards. The FHA guidelines specify that certain units must be accessible to people with disabilities. The required percentage and the configuration of accessible units can depend on the building’s size, number of stories, and whether it includes an elevator.
In practice, many multifamily developments are designed so that a portion of the units are fully accessible and adaptable, with additional units designed to be easily adaptable to different disability needs. This approach helps ensure compliance with FHA standards while providing flexibility for future residents. It is important to note that the FHA guidelines are minimums; some projects may be required to exceed these standards based on state or local laws.
How Local Codes Influence Accessible Unit Counts
State and local jurisdictions frequently adopt or enhance federal requirements. Some states codify specific percentages of accessible units, while others rely on the FHA framework and apply it alongside state accessibility codes. Local building departments may also require accessible routes, wider doorways, reachable controls, and other features in addition to unit-level accessibility. Compliance is typically verified through plan review and, in some cases, third-party inspections.
Factors that affect the required count include whether the building is elevator-equipped, the total number of units, and if the project is funded with public money or tax credits. Projects financed with certain federal programs or located in certain cities may face stricter targets. For developers, early consultation with code officials and accessibility consultants helps ensure the correct percentage is planned and documented during entitlement and permitting.
Common Rules For New Construction
The most common pattern in practice is a tiered approach based on building size and the presence of an elevator. While exact numbers vary, several well-recognized patterns emerge in new construction across jurisdictions:
- Small, non-elevator buildings (4–6 units): Often require at least one accessible unit, typically designed to be adaptable to different needs.
- Mid-sized buildings (6–20 units) with an elevator: A higher minimum is often applied, commonly around two accessible units or a small percentage (commonly around 2%–4%) of the total units, depending on local rules.
- Large buildings (20+ units) with an elevator: The percentage-based approach becomes more common (for example, 2%–4% of total units) or a specified minimum number of accessible units (for example, 2–4 units), combined with accessible common areas and routes.
In all cases, accessible units are typically designed to be fully usable by residents with mobility impairments, including features such as zero-step entry, wide doors, reachable controls, accessible bathrooms and kitchens, and appropriate storage. The FHA also requires corresponding accessible routes to parking, public spaces, and building amenities when applicable.
Practical Planning And Compliance
To effectively plan for accessibility compliance, developers and property owners should consider these best practices:
- Start early with an accessibility strategy: Engage a qualified accessibility consultant during early design phases to determine the required number of accessible units and how best to layout accessible routes and features.
- Incorporate flexible design: Use adaptable or convertible units that can be easily modified for different disability needs without extensive reconstruction.
- Document compliance decisions: Maintain clear records of how the design meets FHA guidelines and any local variations, including calculations for required units and the locations of accessible units within the building.
- Coordinate with permitting authorities: Ensure plans align with both federal requirements and local codes, and prepare for inspections or third-party verifications where required.
- Plan amenities and common areas accordingly: Accessible paths of travel, entrances, parking, laundry facilities, and amenity spaces should be designed to be usable for residents with disabilities.
For developers, the practical takeaway is to view accessible unit counts as a design parameter that shapes floor plans, parking, and circulation, not just a compliance checkbox. A thoughtful approach improves usability, reduces retrofit costs later, and aligns with universal design principles that benefit all residents.
Table: Example Scenarios By Building Size
| Building Type | Typical Minimum Accessible Units | Notes |
|---|---|---|
| Small non-elevator buildings (4–6 units) | 1 unit | |
| Mid-sized building with elevator (6–20 units) | 2 units or about 2%–4% of total units | |
| Large building with elevator (20+ units) | 2–4 units or about 2%–4% of total units |
These figures illustrate common industry practice rather than a universal mandate. Always verify with local codes and recent updates to FHA guidelines for precise requirements in a given jurisdiction.
What That Means For Building Owners
Owners should view accessibility as a core design element that enhances marketability, resilience, and compliance. By proactively planning the required accessible units and related features, buildings become more attractive to a broader resident base and avoid costly retrofits. Regular reviews of local amendments and updates to federal guidelines help ensure ongoing compliance as codes evolve.
Resources And Next Steps
For more precise guidance, consult:
- U.S. Department of Housing and Urban Development (HUD) – Fair Housing Act Accessibility Guidelines
- State or local building codes and accessibility amendments
- Certified access specialists or accessibility consultants with experience in multifamily housing
Engaging these resources early reduces design changes later and supports compliant, inclusive communities that serve a wide range of residents.