Five lift ops want to split your two-bedroom in Breckenridge. Your instinct is to write "maximum four occupants" into the ad and move on. That instinct is how landlords end up on the wrong end of a familial status complaint, because the same flat cap that keeps a fifth roommate out also keeps out a family of five, and the second one is the version HUD investigates.
The workable answer has three layers, in this order: the building and health code that applies to your unit, any reasonable state or local occupancy ordinance, and a written policy that applies identically to roommates and families. HUD's two-per-bedroom figure is a starting point inside that framework, not a rule you can hide behind.
Where the two-per-bedroom number comes from
It comes from a 1991 internal HUD memo that Congress later directed HUD to adopt as policy. The published version says the department believes an occupancy policy of two people per bedroom is, as a general rule, reasonable under the Fair Housing Act. Landlords tend to stop reading there. The next sentence is the important one: the reasonableness of any occupancy policy is rebuttable, and HUD will not decide compliance based solely on the number of people permitted in each bedroom.
The memo then lists what HUD does look at. Bedroom size and overall unit size, so that two large bedrooms plus generous living space may reasonably hold more than four people while a small two-bedroom mobile home may not. The age of the children, since an infant sharing a bedroom with two parents reads differently than a teenager doing the same. Unit configuration, including whether there's a den or study. Physical limits like septic, sewer, or building system capacity. And state or local occupancy requirements, which HUD treats as a circumstance tending to show a landlord's policy is reasonable when the policy reflects them.
Two lines from that guidance deserve to be taped to your desk. A policy limiting the number of children per unit is less likely to be reasonable than one limiting the number of people. And HUD counts it against you if you enforce your occupancy policy only against families with children.
The Fair Housing Act itself says nothing in the Act limits the applicability of reasonable local, state, or federal restrictions on maximum occupants. That is the safe harbor. It protects a code-based limit. It does not protect a number you made up.
Start with the code
Most towns in tourism country have adopted a version of the International Property Maintenance Code, and its occupancy section is specific. Under IPMC 404.4.1, a bedroom must contain at least 70 square feet, and a bedroom occupied by more than one person must contain at least 50 square feet per occupant. A 120-square-foot bedroom holds two under that math. A 160-square-foot bedroom holds three.
That changes the lift op problem. If your Frisco condo has one 170-square-foot bedroom and one 110-square-foot bedroom, the code answer is three in one and two in the other, and five people is not automatically overcrowding. If both bedrooms are 105 square feet, you have a defensible reason to say four.
Call your town or county building department and ask which code edition they've adopted and whether they've amended the occupancy sections, because local amendments are common. Then check the things the code cares about that a square-footage calculation misses: egress windows in each sleeping room, one bathroom's worth of plumbing capacity, and septic system sizing, which in unincorporated Teton County or the outskirts of Truckee can be the real constraint. Septic capacity is on HUD's own list of legitimate limiting factors, so document it if you're relying on it.
Then check the local ordinance, and know that some of them are gone
Ski towns spent decades capping the number of unrelated people who could share a house. In Colorado those caps are no longer enforceable. The 2024 HOME Act, codified at C.R.S. 29-20-111(3), tells local governments they may not limit how many people live together in a dwelling based on familial relationship, and leaves them authority to set limits based only on demonstrated health and safety standards, meaning building code, fire code, wastewater and water quality standards, or affordable housing program guidelines. The state's guidance to local governments spells out the distinction.
For a Summit County owner, that means the old mental model is dead. "Three unrelated adults maximum" is not a rule you can borrow from a neighboring town's code, because that neighboring town had to repeal it. What survives is capacity: square footage, egress, fire, septic.
Other states haven't done this, and rules vary town by town. Wyoming and California owners should read their actual municipal code rather than assume either way. Two more layers catch people out. Deed-restricted workforce units carry their own occupancy and eligibility conditions through the housing authority that administers them, and those conditions can be stricter than code. Short-term rental permits often carry a separate, lower occupancy cap that has nothing to do with what a long-term lease may allow.
Write one policy and apply it to everyone
The cleanest structure is a written occupancy standard tied to the unit rather than the applicant: this unit permits X occupants, based on bedroom dimensions under the applicable property maintenance code and the septic permit. Then apply it identically. Five lift ops and a family of five get the same answer, and you can prove it, because the answer came from the unit.
Where landlords get caught is inconsistency. Letting four roommates share a two-bedroom while telling a couple with two kids that the same unit is limited to three people is the exact pattern HUD's guidance flags as evidence that the stated policy is a pretext.
A lease clause that holds up looks something like this: occupancy of the premises is limited to the persons named in this lease, not to exceed X occupants, consistent with applicable building and health codes. All adult occupants sign, all adult applicants get screened against the same published criteria, and children are not counted differently from adults.
The concerns underneath the cap, and what to do about them instead
Landlords rarely want a headcount limit for its own sake. They want to control wear, parking, utilities, and noise. Each of those has a neutral mechanism.
Wear and damage. Take a deposit at the maximum your state allows, document condition with dated photos at move-in and move-out, and inspect at a defined interval written into the lease. Charge for damage you can document rather than for the number of people you suspect will cause it.
Parking. Assign a fixed number of spaces per unit and enforce it. In a town where a fifth roommate means a fifth truck on a snow route, the parking rule does the work you wanted the occupancy rule to do, and it's tied to a real resource.
Utilities. Sub-meter where you can, or build a flat utility allowance into rent with overage billed on the actual statement. Avoid per-head surcharges: applied to a household with children, a per-person charge starts to look like charging families more, which is where familial status claims come from.
Guests. Set one guest policy, a maximum consecutive-night limit for anyone not on the lease, and enforce it for every household. That handles the friend who arrives for a powder week and stays until April without your policy touching anyone's family.
Listing language that draws complaints
Advertising is where an occupancy policy usually becomes evidence. Each example below is non-compliant. TurnSeasons runs a fair housing filter on housing listings at submission, so language like this gets flagged before it publishes, but the underlying rule applies wherever you post.
Don't write: "Perfect for 4 single lift ops. No kids." This states a preference against families with children, which is familial status discrimination in advertising. The occupancy number may be fine; the exclusion is not.
Don't write: "Adults only" or "Mature tenants preferred." Same problem, less obviously. Outside qualified housing for older persons, which a seasonal rental will not be, an adults-only rental is not lawful.
Don't write: "Students only" or "Young professionals." This signals a familial status preference, tends to screen out households with children, and in states that protect age or marital status in housing it reaches those classes too. Say what you actually mean, which is usually the lease term and the rent.
Don't write: "Maximum 2 children." HUD's guidance says a policy limiting the number of children is less likely to be reasonable than one limiting the number of people. Limit people, not children.
Write instead: "Two-bedroom, occupancy limited to 4 under local code. 6-month lease, $X, all adult occupants on the lease."
Who's protected, and by which law
Federal law lists race, color, religion, sex, national origin, familial status, and disability. Familial status covers households with a child under 18, pregnant people, and anyone in the process of securing custody, which is why occupancy policy is a familial status issue rather than an abstract one.
State law adds more, and in the towns TurnSeasons covers it adds a lot. Colorado's Anti-Discrimination Act covers marital status, sexual orientation, gender identity and expression, and ancestry alongside the federal classes, and California's Fair Employment and Housing Act is comparably broad. Colorado also prohibits source-of-income discrimination, though the Civil Rights Division notes exceptions for landlords with three or fewer rental units and, for housing choice vouchers, owners of five or fewer single-family homes. Federal guidance on sexual orientation and gender identity has shifted repeatedly since 2021, but state law in Colorado and California is unambiguous, so for owners in those states the practical answer hasn't changed.
Wyoming is its own case. The state has a Fair Housing Act at Wyo. Stat. § 40-26-101 et seq., but as a 2025 U.S. Commission on Civil Rights advisory report documented, it has no state agency HUD has certified to enforce it, which means a Jackson tenant's complaint generally goes to HUD directly.
None of this is a substitute for advice on your specific unit, and occupancy questions get fact-specific fast. Measure the bedrooms, call the building department, write the policy down, and apply it the same way to every household that asks. When the policy is ready, put the number in the listing itself. Owners who list seasonal housing with clear occupancy and lease terms field fewer dead-end inquiries, and the city pages will show you how comparable units in your town are pricing this season. The seasonal lease terms that go around the occupancy clause matter just as much.