Fair housing and the owner-occupied exemption for buildings of four units or fewer

What the law says

42 U.S.C. 3603(b)(2) exempts rooms or units in dwellings containing living quarters occupied or intended to be occupied by no more than four families living independently of each other, if the owner actually maintains and occupies one of the living quarters as a residence. It is often called the Mrs. Murphy exemption. Subsection (b)(1) is a separate exemption for certain single-family houses an owner sells or rents, with its own conditions.

Notice the conditions. The building has four units or fewer. The owner lives in one of them as their own home. A landlord who owns a fourplex but lives across town does not qualify.

What the exemption does not cover

• Advertising. Section 3604(c) makes it unlawful to make, print or publish any notice, statement or advertisement for a rental that favors or limits people based on a protected trait. The exemptions in 3603(b) cover section 3604 only other than subsection (c), so the ad rule still applies.
• State and local laws. Many states and cities have their own fair housing laws, often with a smaller exemption or none, and sometimes protecting more groups than federal law does (source of income is a common example). Check your state agency.

The federal protected traits listed in section 3604(a) are race, color, religion, sex, familial status and national origin, and disability is covered in the subsections that follow.

Why most owners do not rely on it

Relying on an exemption means you have to be right about every fact: that you really occupy a unit, that the unit count is correct, that your state has no stricter rule and that your ad said nothing it should not. One mistake and the exemption is gone, and the complaint is about what you did, not what you could have done.

A simpler habit protects you: use the same written criteria for every applicant, hand them to each applicant, answer every inquiry the same way and keep a record of who applied and why you chose one over another.

Example a made-up duplex owner lives upstairs and rents the lower unit. Three applicants ask. The owner's written criteria say income of three times rent, no evictions in seven years and a clean reference from the last landlord. All three get the same sheet. The owner picks the first who meets every line and keeps the other two applications in a folder. If anyone asks later why, the answer is on paper.

Words to leave out of a listing

The ad rule is the one owners trip on, because it feels harmless to describe a home's perfect tenant. Describe the home, not the person: bedrooms, rent, appliances, pet rules, lease length and the date it is available. Phrases about who a place is "ideal for" or "not suitable for" can read as a limit. Our post on AI and fair housing risks lists the same traps for generated text.

How DoorKeeping handles it

You can ask your own Claude or ChatGPT, connected to DoorKeeping, to reread a draft listing for wording about people instead of the home, and nothing is published without your approval. DoorKeeping costs $2 per unit per month with every feature included. It gives no legal advice, so check your state fair housing agency for the rules where you live.

Sources

1. 42 U.S.C. 3603, Effective dates of certain prohibitions (exemptions in (b)), read Oct 30, 2026
2. 42 U.S.C. 3604, Discrimination in the sale or rental of housing (advertising in (c)), read Oct 30, 2026

Questions

Does the owner-occupied exemption let me pick tenants any way I like?

No. It never covers discriminatory ads or notices, and state and local laws often have no such exemption. Using the same written criteria for everyone is the safer path.

How many units can the building have?

The federal exemption in 42 U.S.C. 3603(b)(2) covers buildings with no more than four units where the owner lives in one of them.

Does a landlord who lives elsewhere qualify?

No. The text requires that the owner actually maintains and occupies one of the living quarters as a residence.