Maryland rental occupancy limits are not set by a single statewide number. Three layers of rules combine to decide how many people can legally live in a rental: local zoning ordinances (which usually cap unrelated occupants at five), building codes adopted from the International Property Maintenance Code (which require at least 70 square feet of bedroom space for one person and 50 square feet per person when a bedroom is shared), and federal fair housing law (which treats two people per bedroom as a reasonable benchmark). The actual number for a given property depends on where it sits, how many bedrooms it has, and whether the occupants are related.
The Zoning Cap on Unrelated Occupants
The first limit most renters run into comes from how a local jurisdiction defines “family” in its zoning code. Residential zones generally allow any number of related people to share a home, subject to the physical capacity of the space, but they cap unrelated occupants. In Montgomery County, no more than five unrelated people may live together as a single housekeeping unit.1Montgomery County Government. Q and As – Being Good Neighbors: Maintaining the Residential Character of County Neighborhoods The City of College Park enforces the same five-person cap, and it comes up regularly around the University of Maryland where student rentals push against it.
This kind of rule has been settled law for half a century. In Village of Belle Terre v. Boraas (1974), the U.S. Supreme Court held that a municipality may define “family” to exclude groups of unrelated people, as long as the classification is rationally related to a legitimate purpose such as controlling density, noise, or neighborhood character.2Justia Law. Village of Belle Terre v Boraas 416 US 1 (1974) Maryland local governments rely on that ruling when they enforce their own caps.
Zoning also decides what kind of housing can exist on a lot at all. Montgomery County’s R-60 zone is for single-family detached homes; R-20 permits multi-unit residential buildings.3Montgomery County Department of Permitting Services. Section 4.4.9 Residential – 60 Zone R-60 Standard Method Development Standards Renting out a single-family home as several separate units, without the zoning approval to do so, is a common violation. Baltimore City has historically restricted such conversions in most residential districts, though the pending Housing Options and Opportunity Act before the city council would open some single-family areas to duplexes, triplexes, and fourplexes.4Baltimore City. Baltimore City Announces Interactive Map Highlighting Housing Options and Opportunities Act Impact Until it passes, the older restrictions still apply.
What the Building Code Requires
Maryland adopted the International Property Maintenance Code as the basis for its statewide Minimum Livability Code, which sets baseline habitability standards for every residential rental in the state.5Maryland Department of Labor. Maryland Minimum Livability Code – Building Codes Administration Counties may adopt newer editions or add stricter rules, but every jurisdiction must at least meet these floors.
Bedroom Square Footage
A bedroom for one person must have at least 70 square feet of floor area. When two or more people share a bedroom, the room must provide at least 50 square feet per occupant.6UpCodes. Chapter 4 Light, Ventilation and Occupancy Limitations – IPMC 2021 A couple sharing a 90-square-foot bedroom falls short of the 100-square-foot minimum for two occupants, even if the room feels adequate. Landlords who market small rooms as bedrooms to boost occupancy hit this limit constantly.
Ceiling Height
A room does not count as habitable space unless the ceiling is at least 7 feet high. A sleeping room with a sloped ceiling must maintain that 7-foot clearance over at least one-third of the required floor area. Basements used only for laundry or recreation can drop to 6 feet 8 inches, but a basement bedroom still needs the full 7 feet. That single rule takes most unfinished basements and low-ceilinged attic rooms off the table as legal sleeping space.
Egress and Fire Safety
Every bedroom must have at least one emergency escape route, usually a window large enough for a person to climb through. Smoke detectors and carbon monoxide alarms must meet state fire code. Multi-family buildings often carry additional requirements such as sprinklers and fire-rated walls between units. Basement apartments must satisfy all of these, and many do not, which is why illegal basement rentals are among the most common enforcement targets in Maryland’s denser jurisdictions.
Plumbing and Utilities
Each dwelling unit must have its own working toilet, sink, and bathtub or shower, plus a kitchen sink and cooking facilities. Rooming houses and other shared arrangements have their own per-occupant ratios for shared bathrooms. Electrical capacity is regulated too. Properties built as single-family homes and later chopped into rental units often fail here because the original systems were never sized for the added load.
The Federal Two-Per-Bedroom Guideline
On top of local rules, occupancy policies have to comply with federal fair housing law. HUD’s 1998 guidance, often called the Keating Memo, treats two people per bedroom as generally reasonable under the Fair Housing Act.7Department of Housing and Urban Development. Fair Housing Enforcement – Occupancy Standards Notice of Statement of Policy It is a benchmark, not a hard cap, and HUD uses it to test whether a policy discriminates against families with children.
HUD weighs several factors when deciding whether a stricter or looser limit is justified:
- Bedroom and unit size, since a physically large bedroom may reasonably hold more than two.
- Unit configuration, since dens, studies, or other extra rooms can support higher overall occupancy.
- The age of any children involved, since an infant sharing a bedroom with two parents differs from a teenager doing the same.
- Building system capacity, such as septic, sewer, or water limits.
- State and local law: a policy that mirrors local requirements is treated as evidence of reasonableness.
A landlord who sets a limit below two per bedroom needs a legitimate, non-discriminatory reason. Policies that cap the number of children rather than the total number of people are an immediate red flag. The Fair Housing Act prohibits unreasonable restrictions on families with children, outright refusal to rent to them, and steering families with children into particular parts of a property.8Department of Justice: Civil Rights Division. The Fair Housing Act
Group Homes and Reasonable Accommodations
The federal Fair Housing Act and the Maryland Fair Housing Act (State Government Article §§20-701 through 20-710) prohibit occupancy rules that discriminate on the basis of race, disability, familial status, or other protected characteristics.9Montgomery County, Maryland Office of Human Rights. Fair Housing for Persons With Disabilities This matters most for group homes serving people with disabilities. A local cap on unrelated occupants can conflict with fair housing law when it blocks, say, six unrelated adults with disabilities from sharing a home in a single-family zone. In that situation, the property owner or residents can request a reasonable accommodation asking the jurisdiction to make an exception so people with disabilities have an equal opportunity to live in the community.
The request is submitted in writing and explains the link between the disability and the needed accommodation. The housing provider or zoning authority has to respond within a reasonable timeframe, and unreasonable delay is treated as a denial. The accommodation must be practical and feasible; the provider does not have to make changes that impose an undue financial or administrative burden. Blanket refusals to consider such requests have consistently been held to violate fair housing law.
Enforcement and Penalties
Occupancy problems usually come to a jurisdiction’s attention through neighbor complaints, and enforcement falls to local housing code officers or zoning officials. The process starts with an inspection. If violations are confirmed, the landlord gets a written notice specifying what has to be corrected and by when.
Many Maryland jurisdictions also require a rental license, and that license becomes the practical enforcement lever. Montgomery County requires every residential rental to be licensed with the Department of Housing and Community Affairs before it can be rented or advertised, and the property must comply with all zoning, housing, building, fire, and safety codes to qualify. Operating without a license triggers a $500 civil citation, and landlords who receive a Notice of Violation must correct all listed problems within 10 days.10Montgomery County Government. Landlord Rental License – Housing and Community Affairs A pattern of overcrowding violations can lead to license suspension or revocation, which effectively shuts down the rental.
Montgomery County
Zoning violations in Montgomery County carry civil fines that accrue daily for each day the violation continues.11American Legal Publishing. Montgomery County Zoning Code – Sec 59-A-1.3 Violations, Penalties, and Enforcement Criminal violations default to Class A, with a maximum fine of $1,000 per offense.12American Legal Publishing. Montgomery County Code – Sec 1-19 Fines and Penalties Combined with the risk of losing the rental license, exposure adds up quickly.
Baltimore City
Violating Baltimore’s building code is a misdemeanor. After a Notice of Violation, the landlord has 14 days to fix the problem. Every additional day the violation continues counts as a separate offense with a fine of up to $500.13City of Baltimore Law Library. Baltimore City Building Code – Section 114 Violations Ignoring the notice for a month adds roughly $8,000 in fines on top of the misdemeanor conviction.
What Happens to Tenants
Enforcement usually targets landlords, but tenants are not untouched. Subletting without authorization or bringing in extra occupants against the lease can lead to eviction. Tenants who moved into what turns out to be an illegal unit, such as an unpermitted basement apartment, have separate protections. Maryland’s warranty of habitability, codified at Real Property Article §8-212, requires landlords to keep every rental unit fit for human habitation throughout the tenancy.14Maryland General Assembly. Maryland Code Real Property Article 8-212 If the unit itself violates building codes, the tenant can notify the landlord in writing, and if repairs are not made within a reasonable time, the tenant may sue for damages, withhold rent as an affirmative defense, or both.
When a Guest Becomes an Occupant
One gray area catches both sides of the lease off guard: the point at which a guest turns into an unauthorized occupant. Most Maryland leases restrict how long a guest may stay before they count against occupancy. A common threshold in lease agreements is 14 consecutive days, though the exact number varies by lease and jurisdiction. Signs a guest has crossed the line include receiving mail at the address, keeping personal belongings there permanently, and having their own key. A landlord who identifies an unauthorized occupant can treat it as a lease violation and begin enforcement. For the guest, overstaying can cut the other way: in some circumstances, a person who has established residency picks up tenant protections that make removal harder than simply asking them to leave.