Is it legal to rent out my basement?

In most cases yes, but it depends on your local zoning, building code, and (in some cities) a separate registration or permit for accessory dwelling units. Before you list it, check with your city or county building department. Some neighborhoods allow basement rentals only if certain code requirements are met (egress, ceiling height, separate entrance).

What is the egress requirement for a basement bedroom?

Most jurisdictions follow some version of the International Residential Code: every legally rentable basement bedroom needs an egress window or door big enough for a person to escape and a firefighter to enter. The typical minimums are roughly a 5.7 sq ft opening, at least 24 inches tall and 20 inches wide, with the sill no higher than 44 inches off the floor. Window wells need to be a minimum size and have a ladder if deep. Confirm exact figures with your local code.

Do I need carbon monoxide detectors?

Almost always, yes. Most states require a working CO detector on every level that has a fuel-burning appliance (furnace, water heater, gas dryer) or an attached garage. Smoke detectors are required in every bedroom and on every level. Replace batteries on move-in and document it.

Should I use a Room Rental Agreement or a full Residential Lease?

Use a Room Rental Agreement when the tenant shares any part of the home (entry, kitchen, laundry, utilities) with you or other tenants. Use a Residential Lease when the basement is a fully separate unit with its own entrance, kitchen, and bathroom and the tenant has no shared spaces with you. The difference matters for privacy, house rules, and what you can include in the lease.

How do I split utilities for a basement tenant?

Three common options: (1) bundle all utilities into rent, which is simplest but locks the rate; (2) charge a flat utilities add-on per month based on a reasonable estimate; (3) sub-meter electricity and bill actual usage. Pick one and write it into the lease. Whichever you pick, do not change methods mid-lease without an amendment.

Can I keep house rules (no overnight guests, quiet hours) in the lease?

Yes, as long as the rules are reasonable, applied consistently, and do not violate fair-housing rules. House rules work better in a Room Rental Agreement, where shared-space behavior is part of the deal. In a fully separate basement unit, you have less authority to dictate guest or noise rules beyond what disturbs the rest of the property.

Does renting my basement affect my homeowner's insurance?

Yes, almost certainly. A standard homeowner's policy may not cover liability from a tenant. Call your insurer before the tenant moves in and ask whether you need a landlord endorsement or a separate rider. The cost is usually modest. The cost of being uninsured when something goes wrong is not.

How much can I charge for a basement apartment?

Look at comparable basement and accessory units in your area, factor in whether utilities are included, and check our Fair Market Rent Lookup for the HUD baseline by county and bedroom count. Basement units typically rent at a discount to above-grade units in the same neighborhood, but a separate entrance, full kitchen, and good light close that gap.

Renting Out a Basement Apartment

A basement rental is the best return-per-square-foot most homeowners will ever see. It is also the part of your house with the strictest code requirements. Here is how to do it cleanly.

Step 1: Confirm it is a legal rental

Before you write a listing, find out whether your jurisdiction allows the basement to be rented at all. Three things to check:

Zoning. Some single-family zones do not permit a second dwelling unit. Others allow it as an accessory dwelling unit (ADU) with permits.
Building code. Egress, ceiling height (typically 7 feet minimum), and separate-entrance rules vary by state and city.
Registration or permit. Many cities now require landlords to register rental units, get a certificate of occupancy, or pass a basic inspection before renting.

A 30-minute call to your local building department saves you from advertising a unit you cannot legally rent.

Step 2: Hit the safety basics

These are the items that come up in nearly every state and that landlords most often miss:

Egress window or door in every basement bedroom. The opening has to be big enough for an adult to climb out and a firefighter to climb in. Window wells need a ladder if deep.
Smoke detectors in every bedroom and on every level, hardwired with battery backup in newer construction.
Carbon monoxide detectors on every level with a fuel-burning appliance and outside sleeping areas.
GFCI outlets in bathrooms, kitchens, and any outlet within 6 feet of a sink.
Stair handrails and adequate lighting on the basement stairs.
Posted address visible from the street so emergency services find the right entrance.

Step 3: Pick the right lease type

The decision is really about how separate the unit is from the rest of your home.

Use a Room Rental Agreement when the tenant shares any space

If the basement does not have its own kitchen, the tenant uses your laundry, the bathroom is shared, or there is a single entry to the house, this is a roommate situation in legal terms. A Room Rental Agreement covers shared-space rules: quiet hours, guest policy, kitchen use, common area cleaning, and what utilities are bundled in.

Use a Residential Lease when the basement is a true separate unit

If there is a separate entrance, full kitchen, full bathroom, and the tenant never has to walk through your living space, treat it as a standalone apartment. A Residential Lease Agreement is the right document. The tenant's privacy expectations are higher and the lease should reflect that.

Shared spaces: Room Rental Separate unit: Residential Lease

Step 4: Decide how to handle utilities

You usually have three workable options. Pick one before the listing goes up.

Bundled. Rent includes all utilities. Easy to advertise, but you absorb price spikes. Best when usage is hard to separate.
Flat add-on. Rent plus a fixed monthly utilities charge based on a reasonable estimate. Adjust at lease renewal, not mid-term.
Sub-metering. Install a separate electric sub-meter and bill actual usage. Fairest but requires upfront cost and metered billing each month.

Whichever you pick, write it into the lease. "We'll figure it out" is the most expensive utility plan ever invented.

Step 5: Insurance and tax

Two calls to make before move-in:

Your insurer. Ask whether you need a landlord endorsement or a separate rider for the rented unit. A standard homeowner's policy often excludes liability for paying tenants.
A tax pro. Renting part of your primary residence changes how you report income and what you can deduct. The percentage of the home rented matters for utilities, depreciation, and (if you ever sell) the capital-gains exclusion on your home.

Step 6: Set the rent

Use our Fair Market Rent Lookup to see HUD's baseline for your county and bedroom count. Compare against local listings for basement and ADU units. Adjust for whether utilities are bundled, parking, private entrance, and amount of natural light.

Need to screen applicants? Run the income through our Rent-to-Income Qualifier for a quick approve, borderline, or decline call using the standard 3x rule.

Bottom line

Get the code stuff right, pick the lease type that matches the level of separation, and write down the utilities plan before anyone signs. The basement rental that turns into a problem is almost always one that skipped one of those three.