Accessibility in multifamily: CBC 11A meets the federal Fair Housing Act

California multifamily lives under two overlapping accessibility regimes: CBC Chapter 11A, the state's covered-multifamily design standards, and the federal Fair Housing Act's design-and-construction requirements — 42 U.S.C. § 3604(f)(3)(C), implemented at 24 C.F.R. § 100.205. They overlap heavily but are not the same, and compliance with one is not automatic compliance with the other.

The stakes are asymmetric: design defects under the federal Act attach to the building, and DOJ and HUD design-and-construction enforcement has reached projects years after completion. Common and public areas — including the leasing office — additionally pull CBC Chapter 11B and the ADA. On any acquisition of post-1991 product, accessibility is a diligence line, not a design footnote.

Chapter 11A applies to covered multifamily dwellings — apartment buildings of three or more units and condominiums of four or more — and its organizing idea is the adaptable unit: built with conventional finishes but designed so it can be converted for a resident with a disability without reconstruction. The standards run through accessible routes into and through the building, primary entries, door widths, and bathroom and kitchen clearances and reinforcement.

Chapter 11A governs the dwelling side; Chapter 11B — California's ADA-aligned public-accommodation standards — governs the common and public areas, from parking and pool decks to the leasing office, which is a place of public accommodation in its own right. A compliant unit mix does not cure a noncompliant clubhouse, and vice versa.

The federal design-and-construction rules cover buildings of four or more units first occupied after March 13, 1991. In buildings with an elevator, every unit is covered; in non-elevator buildings, all ground-floor units are. The regulation sets out seven requirements:

• The seven federal requirements:
• An accessible building entrance on an accessible route
• Accessible public and common-use areas
• Doors usable by a person in a wheelchair
• An accessible route into and through each covered unit
• Light switches, outlets, thermostats and controls in reachable locations
• Reinforced bathroom walls for later grab-bar installation
• Usable kitchens and bathrooms with adequate maneuvering space

HUD recognizes a specific list of federal safe harbors (the Fair Housing Act Design Manual and certain ANSI-based standards among them) — and California's Chapter 11A is not an automatic federal pass. Careful teams design and document to a recognized federal safe harbor and the CBC, because plan check only verifies the state side.

DOJ and HUD have brought design-and-construction cases against builders, architects and owners years after completion, and the practical remedy — retrofitting units, routes and common areas — lands on whoever owns the building when the claim arrives. Buying post-1991 product means buying its as-built accessibility, known or not.

• Underwriting watch-outs:
• Commission an as-built accessibility survey (unit sampling plus full common-area and route review) on any acquisition of post-March 1991 product, and price the retrofit list into the deal.
• Allocate accessibility risk expressly in the purchase agreement — generic condition reps rarely reach federal design-defect exposure.
• Federally assisted deals stack Section 504/UFAS obligations on top — typically 5% mobility-accessible and 2% hearing/vision units in new construction — see Section 8, HOME and labor layers.
• In renovations, alteration work can trigger 11B path-of-travel upgrades — coordinate with the CEBC analysis in the CEBC and adaptive reuse.