The minimum square footage per person in a home comes from the International Property Maintenance Code, the model housing code most U.S. cities and counties adopt. Under that code, every habitable room must be at least 70 square feet, and any bedroom shared by more than one person must provide at least 50 square feet per occupant. Those are the baseline numbers. The figures that actually bind your property are set by the local government where it sits, and federal fair housing law limits how a landlord can apply them.
The Baseline Per-Person Numbers
The International Property Maintenance Code (IPMC), published by the International Code Council, is the model code most local governments start from when writing housing and occupancy rules. The 2024 edition sets these minimums:
- Any habitable room: at least 70 square feet.
- Shared bedrooms: at least 50 square feet per person. A bedroom for two needs 100 square feet; for three, 150.
- Living rooms: at least 120 square feet when the unit houses three to five occupants.
- Dining rooms: at least 80 square feet for three to five occupants, and 100 square feet for six or more.
Read the bedroom rule carefully. The 50-square-foot-per-person figure applies only when more than one person shares a bedroom. A bedroom used by one person still needs 70 square feet, because that is the floor for any habitable room.1UpCodes. IPMC 2024 Chapter 4 Light, Ventilation and Occupancy Limitations Kitchens and other nonhabitable spaces cannot be used as sleeping areas at all, no matter how large they are.
What Counts as Habitable Space
Occupancy math only uses habitable space, meaning rooms designed for living, sleeping, eating, or cooking. Bathrooms, closets, hallways, utility rooms, and unfinished basements or attics do not count. A 900-square-foot apartment with 200 square feet of hallways, closets, and bathrooms has roughly 700 square feet of habitable area for occupancy purposes.
Ceiling Height
A room also has to meet a minimum ceiling height to qualify as habitable. The IPMC requires at least 7 feet of clear ceiling height in habitable rooms, hallways, bathrooms, and finished basements.1UpCodes. IPMC 2024 Chapter 4 Light, Ventilation and Occupancy Limitations Basement spaces used only for laundry, study, or recreation can drop to 6 feet 8 inches, with 6 feet 4 inches allowed under beams or ducts.
Sloped Ceilings
Finished attics and bonus rooms with sloped ceilings follow a modified calculation. At least one-third of the required floor area has to sit under a ceiling of 7 feet or more, and only the portions of the room with ceilings of at least 5 feet count toward floor area at all. A finished attic bedroom that measures 150 square feet wall to wall but has 60 square feet under ceilings below 5 feet has only 90 square feet of usable floor area for code purposes.1UpCodes. IPMC 2024 Chapter 4 Light, Ventilation and Occupancy Limitations
Manufactured Homes Follow Different Rules
Mobile and manufactured homes are not covered by the IPMC. They are governed by federal construction standards under 24 CFR Part 3280, known as the HUD Code, and the per-person numbers come out differently:
- Main living area: at least 150 square feet of gross floor area.
- Any bedroom: at least 50 square feet.
- Shared bedrooms: 70 square feet for two people, plus 50 square feet for each additional person beyond two.
A manufactured-home bedroom for two needs 70 square feet, where the IPMC would require 100. A bedroom for three needs 120 under the HUD Code and 150 under the IPMC.2eCFR. 24 CFR Part 3280 Manufactured Home Construction and Safety Standards Ceilings must be at least 7 feet over at least 50 percent of a room’s floor area.3eCFR. 24 CFR 3280.104 Ceiling Heights
Local Code Is What Actually Binds You
The IPMC is a model, not a law. It becomes enforceable only when a city or county formally adopts it, and jurisdictions often modify the numbers. Some set higher minimums, some lower. A few write their own housing codes without using the IPMC at all. The legal minimum square footage for your property depends entirely on where it sits.
To find the rules that apply, search for your city or county’s “property maintenance code” or “housing code.” Most municipalities post these on their official websites. If you cannot find them online, call the local building department, code enforcement office, or public health department. These agencies administer the code and can tell you the exact occupancy limits for a specific address.
In a dispute about overcrowding, a housing inspector or court looks at the locally adopted code, not the model version. A landlord is bound by whatever the local government has on the books.
Fair Housing Law Limits How Landlords Apply Occupancy Caps
Square-footage rules do not sit alone. The Fair Housing Act makes it illegal to refuse to rent, or to impose different terms, because of familial status, which includes households with children under 18.4Office of the Law Revision Counsel. 42 USC 3604 Discrimination in the Sale or Rental of Housing An occupancy policy that disproportionately shuts out families with children can trigger a discrimination claim even if it reads as neutral.
The Two-Per-Bedroom Guideline
HUD’s policy statement on occupancy standards, often called the Keating Memo, treats a two-person-per-bedroom policy as generally reasonable. That standard is rebuttable, though. A landlord cannot just announce “two per bedroom” and assume the policy is lawful.5HUD. Fair Housing Enforcement Occupancy Standards Statement of Policy HUD weighs several factors:
- Bedroom size. Capping a small 80-square-foot bedroom at one person may be reasonable; applying the same cap to a 200-square-foot master bedroom looks suspect.
- Unit configuration. A den or study that can function as sleeping space adds livable area the policy should account for.
- Age of children. Two parents and an infant in a one-bedroom unit is a different situation from two adults and a teenager.
- Building systems. Septic or water capacity can legitimately limit total occupancy.
- Local code. A policy that mirrors the locally adopted occupancy code gets more deference.
Policies that cap children specifically, rather than total occupants, raise discrimination flags. So does uneven enforcement against families with children.5HUD. Fair Housing Enforcement Occupancy Standards Statement of Policy
Rules Landlords Cannot Impose
A landlord cannot require that children of different genders have separate bedrooms, forbid a child from sharing a room with a parent, or insist that each child have a dedicated bedroom. Requirements like these functionally exclude larger families and generally fail the Fair Housing Act analysis. Occupancy policies must apply uniformly to all applicants.6eCFR. 24 CFR Part 100 Discriminatory Conduct Under the Fair Housing Act Some local codes also exclude infants under one year old from occupancy counts, which can give new parents a buffer. Check with the local code enforcement office.
What Happens If a Unit Is Overcrowded
Overcrowding violations can land on the landlord, the tenant, or both.
Landlords who rent an overcrowded unit, or who tolerate occupancy creep, face code enforcement. The process usually starts with a notice of violation from the local building or health department. If the problem is not corrected within the stated window, daily fines accrue. Amounts vary by jurisdiction but can reach several hundred dollars a day. Repeated violations can lead to court orders, loss of a rental license, or condemnation of the unit.
Tenants who move extra occupants in beyond what the lease or code allows are in breach. The landlord can serve a notice to cure or vacate and, if nothing changes, start eviction proceedings. Occupancy limits apply to everyone actually living in the unit, not only the people named on the lease, so a partner, friend, or parent who moves in can push a tight unit over the line.
The consequences can also run the other way. Most states recognize an implied warranty of habitability, which obligates the landlord to deliver a unit that meets basic code. A unit that is too small for the number of occupants the landlord approved, that lacks required windows, or that has sub-code ceiling heights may breach that warranty. Depending on the state, the tenant may be able to terminate the lease without penalty, recover a portion of rent already paid, seek moving costs, or withhold rent until the landlord brings the unit into compliance. Withholding generally requires strict adherence to notice procedures, so check the specific rules in your state before trying it.