Renting a room in the home you live in
The spare bedroom is empty, the mortgage is not, and a friend of a friend needs a place. Renting out a room in your own home is one of the oldest ways to make a house pay for itself. It is also the arrangement people most often start with no paperwork at all, because it feels like having a roommate rather than being a landlord. Legally, you are being a landlord.
Your roommate is a tenant
Once someone pays you rent to occupy space in your home, a tenancy exists, whether or not anything is signed. That person has the rights that come with it: a habitable place to live, notice before you enter their room, and removal only through proper notice followed by the court process if they do not leave. Sharing a bathroom does not make them a guest. This is the fact owner-occupants most often learn the hard way, usually at the point where they want the person gone and discover that changing the locks is illegal. See how a guest becomes a tenant and why lockouts backfire.
The exemption people misread
The federal Fair Housing Act exempts owner-occupied buildings of four or fewer units from most of its requirements, which is why an owner renting a room in their own house has more freedom to choose who shares it than a landlord renting a separate apartment does. Two things get missed. First, the exemption does not cover advertising: a listing that states a discriminatory preference is still unlawful. Second, many states and cities have their own fair housing laws that narrow or eliminate the exemption. Check your state and city rules, and keep your listing about the room, not the person you hope will take it. For the broader framework, see tenant screening without fair housing violations.
Shared space is where it goes wrong
Rent and deposit rarely cause the fight. The kitchen does. So does the living room, the guest who stays four nights, the thermostat, and the dishes. A room rental agreement earns its keep in the shared-space section:
- Which room is exclusively the renter's, and that you give notice before entering it.
- Which areas are shared, with any limits (kitchen hours, fridge space, laundry days).
- Overnight guest rules, including how many nights and whether you want to be told.
- Quiet hours, smoking, pets, parking.
- Who cleans what, and how often.
- Who pays utilities, or how they are split.
Written rules feel formal between people who share a fridge. They are also the only version anyone remembers the same way six months later.
Deposits, notice, and ending it
Deposit caps, return deadlines, and itemization rules generally apply to room rentals the same as any tenancy, so hold and return the deposit under your state rules. Set the tenancy as month-to-month unless you want a fixed term, and state the notice each side gives to end it. When it does end, follow the notice period and, if the person stays past it, file rather than force. Some states have a faster lodger removal process for owner-occupied homes; where it exists it is still a legal process, not a lock change. See termination notice by state and deposit limits.
Taxes and insurance, briefly
Rent is income, reportable on your return, with a deduction for the portion of home expenses attributable to the rented space. Tell your homeowner's insurer, because a paying occupant can change your coverage or call for an endorsement, and an undisclosed rental is a bad surprise during a claim. If the room is a separate unit with its own entrance rather than a bedroom in your house, see renting out a basement apartment, where more of the standard landlord rules apply in full.