ADUs (accessory dwelling units) are one of the few US rental types expanding by design rather than only by illegal subdivision. They sit behind or beside a main house and can undercut apartment rents when they are permitted: Rent in the United States.
How do ADUs differ from ordinary apartments?
An ADU is usually a self-contained unit with kitchen, bath, and sleeping space on a single-family lot. Owner-occupancy next door is common, which can mean faster repairs and less anonymity. Backyard cottages in Los Angeles and California cities, Seattle DADUs (detached ADUs), and Portland backyard cottages show up often in mover searches: Renting in Los Angeles, Renting in Seattle, and Living in Portland.
They are not the same as an unpermitted basement room. Illegal units still create vacate risk: Basement apartments. Tiny primary apartments are a different product again: Tiny apartments.
What should renters verify?
Ask for proof the ADU is permitted, how utilities are metered, who maintains the shared driveway, and guest parking rules. Get a written lease, not a cash-only handshake: How to rent a home and Rental contracts and deposits. Tour in person: Avoid rental scams.
Common misconceptions
Assuming every “guest house” listing is legal fails without permits.
Assuming ADU rent always includes utilities also fails when separate meters or flat utility fees apply.
Summary
Rent a US ADU when you want small private space and verified permits. Confirm legality, utilities, and owner-on-site rules before the backyard charm decides for you.
Sources
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