Covered Multifamily Dwellings: Design Rules and Safe Harbors

Under the Fair Housing Act, covered multifamily dwellings are residential buildings with four or more units that were built for first occupancy after March 13, 1991. The label matters because it triggers seven federal design and construction requirements meant to make housing usable by people with disabilities. Miss them, and the cost of retrofitting a finished building, plus civil penalties that now exceed $26,000 per violation, can dwarf what compliance would have cost during construction.

Which Buildings Meet the Definition

The statutory definition sits in 42 U.S.C. § 3604(f)(7) and has two parts. A covered multifamily dwelling is either a building with four or more units that has one or more elevators, or the ground-floor units in a building with four or more units that has no elevator.¹ Everything else about the coverage question flows from that structure.

The four-unit count applies to a single structure, not an entire development. Three duplexes on one lot do not qualify. One building holding four condominiums does. The rules cover apartments, condos, and cooperative housing, rental or for sale, private or federally funded. Mixed-use buildings qualify when the residential portion holds four or more units.

The HUD/DOJ joint guidance also reaches housing types builders sometimes assume are outside the Act: single-story townhouses inside a four-unit building, timeshares, dormitories, and homeless shelters or transitional housing intended for extended stays. What matters is the unit count within one structure, not the purpose of the building or the length of a resident’s stay.

The March 13, 1991 First-Occupancy Cutoff

The design requirements apply only to buildings constructed for first occupancy after March 13, 1991.² Older buildings are not required to be retrofitted, though they remain subject to the Fair Housing Act’s other anti-discrimination protections.

Under 24 C.F.R. § 100.201, “first occupancy” means a building that has never before been used for any purpose.³ A building is also treated as exempt if the last building permit or renewal was issued on or before June 15, 1990, regardless of when construction actually wrapped up. Delaying move-in on a project designed and permitted after those dates will not push it outside the rule. Enforcement typically turns on building permits, certificates of occupancy, and construction records.

Which Units Inside the Building Are Covered

The elevator question decides how much of the building has to comply.

In buildings with one or more elevators, every unit on every floor is covered. Each has to include an accessible interior route, usable kitchens and bathrooms, reinforced bathroom walls, and the rest of the design features the Act requires. The elevator gives residents with mobility impairments access to every floor, so the law expects every unit on those floors to be usable once they arrive.

In buildings without elevators, only ground-floor units must meet the design standards.⁴ Upper-story units in walk-ups are exempt. A ground floor is a level with a building entrance on an accessible route. On a sloped or terraced site, a single building can have more than one ground floor if multiple levels provide direct entry from a sidewalk, parking area, or other arrival point. Every unit on those entry levels counts, which is why hillside construction often ends up with far more covered units than a flat site with the same layout.

Townhouses and In-Unit Elevators

Townhouse configurations can shift the analysis. A single-story townhouse inside a building with four or more units is covered and must meet all the design requirements. A multistory townhouse in the same building is generally not covered when the building has no elevator, because the whole unit is not on a ground floor. Any single-story units in that same building still have to comply, and the public and common areas of the development have to be accessible.

An elevator inside a townhouse unit changes the classification. Once a unit contains an elevator, the building is one that “has one or more elevators” for statutory purposes, so that unit is covered and the common areas of the development must comply as well. That result holds even when the elevator is only roughed in for later installation, such as a stacked-closet shaft designed to accept one.

Renovations, Conversions, and Additions

The design and construction rules apply to new construction, not to renovation of existing buildings.² Remodeling kitchens, replacing floors, or updating bathrooms in a pre-1991 building carries no obligation to bring those spaces up to the seven design standards.

Converting a non-residential building into housing works the same way. A warehouse or office building turned into apartments is not covered, because the Act targets buildings designed and built as housing from the start. The exception is façadism: when a developer preserves only the exterior walls and constructs an entirely new interior, including new structural floors and ceilings, HUD treats it as a new building subject to full compliance.

Additions get parallel treatment. Four or more new units built as an extension of an existing building are treated as a new building and must meet all seven requirements. The older portion of the structure is unaffected.

The Seven Design and Construction Requirements

The Fair Housing Act and its implementing regulation at 24 C.F.R. § 100.205 require seven specific features in every covered dwelling.⁵ HUD’s Fair Housing Act Design Manual spells out the technical details.²

An accessible building entrance on an accessible route connecting parking, sidewalks, and public transportation stops, unless terrain makes it impractical.
Accessible public and common use areas, including lobbies, hallways, mailrooms, laundry rooms, leasing offices, and recreational facilities.
Usable doors. Doors intended for passage into and within a unit must provide at least 32 inches of nominal clear width when open at 90 degrees.
An accessible route into and through the unit. Interior hallways and passages must be at least 36 inches wide, narrowing to 32 inches only at doorways.
Light switches, outlets, thermostats, and other environmental controls placed in accessible locations, mounted between 15 and 48 inches above the floor with no obstruction.⁶
Reinforced bathroom walls around toilets, tubs, and showers so grab bars can be installed later. Typical construction uses solid wood blocking between studs or heavy plywood over them, positioned so grab bars can be mounted with their centerline 33 to 36 inches above the floor.⁷
Usable kitchens and bathrooms. Kitchens need at least 40 inches of clearance between opposing counters and a 30-by-48-inch clear floor space at each appliance. U-shaped kitchens need a 60-inch turning circle or removable base cabinets under the sink or cooktop. Bathrooms need a 30-by-48-inch clear floor space outside the door swing and specified clearances around the toilet, lavatory, and bathing fixtures.⁸

Reinforcement is the item that most often gets missed. The Act does not require grab bars at move-in. It requires the walls to be built so that a resident can install grab bars later without opening up the structure. Skipping that step during framing means expensive demolition after the drywall is up.

The Site Impracticality Exception

The accessible-entrance requirement has a narrow exception for steep terrain. If the slopes between the planned entrance and every vehicular or pedestrian arrival point within 50 feet exceed 10 percent on both the undisturbed site and the planned finished grade, providing an accessible entrance at that location is treated as impractical. The developer, not HUD or the complainant, has to prove it.

For developments with more than one building, a site-wide analysis is available. A licensed engineer or surveyor uses a topographic survey with two-foot contour intervals to calculate the percentage of total buildable area with natural grades under 10 percent slope. The share of ground-floor units that must be accessible matches that percentage. Even under the site-wide method, any ground-floor unit served by an entrance on a route with a slope of 8.33 percent or less has to be accessible.

Most urban and suburban sites do not come close to qualifying, and HUD’s stated position is that developers should design sites to maximize accessible units rather than engineer around the requirement.

Common Areas, Parking, and Amenities

Accessibility does not stop at the apartment door. Under 24 C.F.R. § 100.205, all public and common use areas within a covered development must be readily accessible.⁵ Lobbies, hallways, mailrooms, laundry rooms, and management offices are all covered, along with outdoor amenities like clubhouses, fitness centers, and playgrounds.

Parking is a common source of violations. At least 2 percent of the parking spaces serving covered units must be accessible and on an accessible route. Visitor parking has to include a “sufficient” number of accessible spaces near grade-level entrances, without a specific count in the guidelines. Facilities like pools and recreation buildings need at least one accessible space each.⁹

Pools are a frequent point of confusion. The Fair Housing Act requires the pool deck and surrounding area to be accessible. It does not require a ramp or mechanical lift into the water. Pool lifts may be required separately under the Americans with Disabilities Act, but only if the pool is open to the general public rather than limited to residents and their guests.⁹

HUD-Recognized Safe Harbors

HUD recognizes a list of building codes and accessibility standards that, when followed in full without modification or waiver, satisfy the Act’s design and construction requirements. Builders who follow a recognized safe harbor can point to that code instead of proving each unit independently meets the statute.¹⁰

The current safe harbors include HUD’s Fair Housing Accessibility Guidelines (1991, with the 1994 Q&A supplement), the Fair Housing Act Design Manual (1996/1998), several editions of the International Building Code from 2000 through 2018, and multiple editions of the ANSI/ICC A117.1 standard.⁵ The 2018 IBC is the newest edition with safe harbor status as of the December 2020 rulemaking. Editions published later have not been designated.

The “without modification” language matters. Mixing provisions from more than one safe harbor, or obtaining a local waiver of a specific code provision, can strip away safe harbor protection. Once that happens, the developer bears the burden of showing that each unit independently meets the Act’s requirements.

How This Differs From the ADA

The Fair Housing Act applies to virtually all residential housing with four or more units, whether private or federally funded. Its design requirements are a one-time obligation attached to new construction. The Act does not require retrofitting buildings that predate March 13, 1991, though property owners must allow reasonable modifications by residents with disabilities at any time.

The Americans with Disabilities Act applies to places of public accommodation, not to private residential communities. A residential complex generally does not have to meet ADA accessibility standards unless it opens amenities like pools, gyms, or clubhouses to the general public. When that happens, the ADA imposes an ongoing obligation to upgrade accessibility features whenever doing so is “readily achievable,” even in older buildings. A property that keeps its amenities limited to residents and guests typically falls outside the ADA.

Larger developments often have to satisfy both laws. Designing to whichever standard is stricter for each feature, and tracking which spaces trigger which law, is the practical answer.

Penalties for Getting It Wrong

Design and construction violations are enforced through HUD administrative complaints, private lawsuits, and Department of Justice pattern-or-practice cases. A HUD complaint has to be filed within one year of the last discriminatory act.¹¹ A private lawsuit has to be filed within two years of the alleged discriminatory practice.

Civil penalties in administrative proceedings adjust for inflation each year. The statutory base amounts are $10,000 for a first violation, $25,000 with one prior violation in five years, and $50,000 with two or more priors in seven years.¹² After the most recently published inflation adjustment, those figures stand at $26,262, $65,653, and $131,308.¹³ The numbers apply per violation, so a single building with dozens of noncompliant units can generate dozens of separate violations. DOJ enforcement actions in larger cases routinely produce settlements requiring physical retrofit of entire developments, monetary damages for affected residents, and penalties well into six figures.

1
Office of the Law Revision Counsel. 42 USC 3604 – Discrimination in the Sale or Rental of Housing and Other Prohibited Practices
2
U.S. Department of Housing and Urban Development. Fair Housing Act Design Manual
3
eCFR. 24 CFR 100.201 – Definitions
4
HUD User. Fair Housing Act Design Manual
5
eCFR. 24 CFR 100.205 – Design and Construction Requirements
6
HUD User. Fair Housing Act Design Manual – Chapter 5 – Light Switches, Electrical Outlets, Thermostats, and Other Environmental Controls in Accessible Locations
7
HUD User. Fair Housing Act Design Manual – Chapter 6 – Reinforced Walls for Grab Bars
8
HUD User. Fair Housing Act Design Manual – Chapter 7 – Usable Kitchens and Bathrooms
9
HUD User. Fair Housing Act Design Manual
10
Federal Register. Fair Housing Act Design and Construction Requirements – Adoption of Additional Safe Harbors
11
U.S. Department of Housing and Urban Development. Learn About FHEOs Process to Report and Investigate Housing Discrimination
12
Office of the Law Revision Counsel. 42 USC 3612 – Enforcement by Secretary
13
Federal Register. Adjustment of Civil Monetary Penalty Amounts for 2025