To rent a room in your house legally, you need to confirm the property qualifies under local zoning and building codes, put the arrangement in a written agreement, follow federal fair housing rules when you advertise and screen, tell your insurer and mortgage servicer, and report the rent as income to the IRS. Each of those steps has traps that can cost more than the rent itself, so work through them in order before anyone moves in.
Lodger or Tenant
When you rent a room in a home where you still live and keep access to every part of the house, the occupant usually qualifies as a lodger rather than a tenant. Lodgers have fewer legal protections in many states, which affects how much notice you owe and whether you must go through formal eviction. Some states, though, treat any paying occupant as a tenant regardless of shared living arrangements. Until you confirm which category applies where you live, put everything in writing and follow the stricter landlord-tenant rules.
Check Zoning, Building Code, and HOA First
Local zoning decides whether your home can legally house someone who is not a family member. Single-family residential zones sometimes cap unrelated occupants or limit the number of boarders per household. Call your city or county planning department before you advertise the room and ask two questions: does the zone allow room rentals, and do you need a rental license or updated certificate of occupancy. Annual rental license fees vary widely by municipality, typically running from about $35 to $350.
The room itself has to be habitable under your local building code. Most jurisdictions follow the International Residential Code, which requires a minimum ceiling height of seven feet and an egress window with a net clear opening of at least 5.7 square feet (5.0 on the ground floor) so occupants can escape a fire. Smoke alarms belong inside every sleeping room and on every floor, and many jurisdictions also require carbon monoxide detectors near bedrooms. A code enforcement inspection that finds any of this missing can shut the arrangement down and leave you with fines.
If your neighborhood has a homeowners association, read the CC&Rs. Some HOAs ban room-only rentals outright, others require board approval, and violating a covenant can bring daily fines and forced termination of the rental.
Advertising and Screening Under Fair Housing Law
The Fair Housing Act prohibits discrimination based on race, color, religion, sex, national origin, familial status, and disability.1U.S. Department of Housing and Urban Development (HUD). Housing Discrimination Under the Fair Housing Act An exemption under 42 U.S.C. 3603(b), often called the Mrs. Murphy exemption, lets owner-occupants of dwellings with four or fewer units apply personal preferences when choosing a roommate.2Office of the Law Revision Counsel. 42 USC 3603 – Effective Dates of Certain Prohibitions If you live in the home and are renting a single room, that exemption almost certainly applies to your selection.
The exemption stops at the door of your listing. The statute carves out Section 3604(c), which bans discriminatory language in any rental advertisement.3Office of the Law Revision Counsel. 42 USC 3604 – Discrimination in the Sale or Rental of Housing You can privately prefer a roommate of a particular background; the moment you put that preference on a listing site or a flyer, you have violated federal law. Keep the ad focused on the room, the rent, and the house rules.
Background and Credit Checks
If you pull a credit report or background check on an applicant, the Fair Credit Reporting Act applies. Landlords have a permissible purpose to request consumer reports on rental applicants, but written consent is standard and required by most screening services. The rule that trips people up comes after the report: if you reject an applicant based even partly on what the report says, you must notify them in writing and identify the reporting agency that supplied the information.4Federal Trade Commission. Using Consumer Reports: What Landlords Need to Know Skipping that notice creates liability under 15 U.S.C. 1681m.
Some states cap what you can charge for the screening. Limits run from $20 to about $65 depending on the state, and a few states ban application fees entirely. Where there is no cap, the average nationally is around $50. Check your state’s landlord-tenant statute before setting a fee, because charging more than the legal limit can void the fee altogether.
The Written Agreement
A handshake deal with someone living in your house is a recipe for conflict. A written agreement should cover at minimum:
- Full legal names of both parties, the address, and the specific room being rented.
- Rent amount, due date, accepted payment methods, and any late fee.
- Whether the arrangement is month-to-month or fixed-term, and how much notice either side must give to end it.
- Which shared areas the occupant can use (kitchen, bathroom, laundry) and which are off-limits.
- House rules on guests, quiet hours, parking, smoking, pets, and cleaning.
- Whether utilities are included in rent or billed separately, and if separate, the method for splitting them.
For utilities, a flat charge folded into the rent keeps billing simple but means you absorb any spikes. The alternative is to prorate the actual bill using the room’s share of total square footage or a per-occupant formula. Whichever you pick, spell it out so a January heating bill does not turn into an argument.
If your home was built before 1978, federal law requires you to give the occupant a lead-based paint disclosure before the agreement starts. The disclosure warns of potential hazards and must include any reports or records you have about lead paint in the home. Both parties sign it, and you must keep a copy for at least three years from the start of the rental.5eCFR. 24 CFR Part 35 Subpart A – Disclosure of Known Lead-Based Paint Hazards Upon Sale or Lease of Residential Property Failing to provide it can bring fines of over $19,000 per violation and gives the occupant grounds for damages in court.
Security Deposits
Most states cap the security deposit at one to two months’ rent, with the exact limit varying by whether the room is furnished and, in some states, by the size of the landlord. Collecting more than the legal maximum can force you to return the entire deposit regardless of any damage. Look up your state’s specific limit before you collect anything.
Beyond the cap, states regulate how you handle the money. Roughly a dozen require you to hold the deposit in a separate interest-bearing account and pay the accrued interest to the occupant, either annually or at move-out. When the occupant leaves, most states give you 14 to 30 days to return the deposit with an itemized list of any deductions. That list should describe each repair, its cost, and attach receipts if a deduction exceeds a set threshold. Vaguely described cleaning fees without documentation lose small-claims cases.
Move-In Day
Both parties sign and date all copies of the agreement, the occupant hands over the first month’s rent plus the security deposit, and you provide the keys or access codes.
Before the occupant unpacks, walk through the room and every shared area together with a checklist. Note existing scratches, stains, appliance issues, and anything less than perfect. Both of you sign and date the checklist. That document becomes the baseline for evaluating damage at move-out, and without it you will struggle to justify any deposit deduction. Take timestamped photos as a backup.
For rent going forward, several states require a written receipt for every cash payment, and others require receipts on request. Even where no law requires it, a dated note with the amount, the period covered, and both signatures protects both sides.
Insurance and Mortgage
A standard homeowner’s policy is written for owner-occupied residences, not rental properties. Collecting rent changes the risk profile, and many insurers will deny a fire or liability claim if they discover an undisclosed paying occupant. Call your insurance company before move-in and ask whether you need a rental endorsement or a different policy. For a single room in a house you still live in, a rental endorsement on your existing policy is usually the simplest fix.
Your mortgage deserves the same call. Most conventional mortgages include an occupancy clause requiring the property to be your primary residence. Renting a room while you still live there typically does not violate that clause, but some lenders read any rental activity as a change in use, particularly for FHA-backed loans. Review your loan documents; if the language is unclear, ask the servicer. Failing to disclose a rental that breaches your mortgage terms could theoretically trigger a due-on-sale clause and force you to pay the remaining balance.
Reporting the Rent to the IRS
Every dollar of rent you collect is taxable income.6Internal Revenue Service. Topic No. 414, Rental Income and Expenses Room rental income generally goes on Schedule E (Form 1040). If you provide substantial services to the occupant, such as regular cleaning or meals, the IRS treats the income as self-employment income reported on Schedule C instead.7Internal Revenue Service. Instructions for Schedule E (Form 1040)
One narrow exception: if you rent the room for fewer than 15 days during the entire year, you do not report the income and you cannot deduct any rental expenses. The income is excluded from gross income under 26 U.S.C. 280A(g).8Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home Cross the 15-day line and all of the income becomes reportable.9Internal Revenue Service. Topic No. 415, Renting Residential and Vacation Property
When you rent year-round, you can deduct a proportional share of household operating costs against the rental income. The IRS accepts any reasonable allocation method; the two common ones are dividing by room count or by square footage.10Internal Revenue Service. Publication 527, Residential Rental Property If the rented room is 10% of your home’s square footage, you can deduct 10% of your mortgage interest, property taxes, utilities, insurance, and maintenance. Depreciation on the rental portion of the home is also available under a 27.5-year recovery period, and it is the largest deduction most room-renting homeowners miss. Depreciation gets recaptured when you eventually sell, so keep the records.
One important ceiling: when the home is also your personal residence, your rental deductions for the year generally cannot exceed your gross rental income from that year. Any excess carries forward.
Ending the Arrangement
Month-to-month room rentals end with written notice from either side. The required notice period varies by state, with 30 days most common, some states requiring as little as 15, and others 60 days for long-standing tenancies. Fixed-term agreements end on their stated date, though many states still require a reminder notice before the term expires. Deliver notice in writing and keep proof of delivery.
If the occupant refuses to leave after proper notice or stops paying rent, use your state’s formal legal process. Every state prohibits self-help eviction for residential occupants. Changing the locks, shutting off utilities, or removing belongings without a court order is illegal and can bring criminal misdemeanor charges and civil penalties. The lawful path is to file an unlawful detainer or eviction action in your local court, which typically involves serving a pay-or-quit notice, filing a complaint, attending a hearing, and obtaining a court-ordered writ of possession. Expect several weeks at minimum from filing to removal.