Renting an ADU (Granny Flat / Back House) in Los Angeles: A Renter's Guide

Los Angeles is full of them: the converted garage out back, the little cottage behind the main house, the studio above the detached garage. These are accessory dwelling units (ADUs) — and thanks to a wave of state laws designed to ease California's housing shortage, they have become one of the most common types of rental in LA. If you are renting one (or thinking about it), the rules are a little different from a standard apartment. This guide explains what an ADU is, whether rent caps apply to yours, how to handle permit and habitability problems, and what rights you have as a tenant.

CertRent is a free, verified renter-profile platform. This guide is educational information about California and Los Angeles law, not legal advice for your specific situation.

What is an ADU?

An ADU is a secondary, self-contained living unit on a lot that already has a primary home. It has its own kitchen, bathroom, and sleeping area. You will hear ADUs called many informal names — granny flat, in-law unit, back house, backyard cottage, casita, or secondary unit. California's Department of Housing and Community Development (HCD) treats all of these as ADUs. There is also a smaller category called a junior ADU (JADU), which is carved out of the existing main house (often a converted bedroom), maxes out around 500 square feet, and may share a bathroom with the main home.

Renting an ADU is completely legal in California. State law (Government Code sections 65852.2 and following) actively encourages ADUs and blocks cities from banning them or piling on unreasonable restrictions. What matters most for you as a tenant is not whether the unit is allowed — it is — but whether it was permitted, and which rent and eviction rules cover it.

Do AB 1482 rent caps apply to my ADU?

This is the question renters ask most, and the honest answer is: it depends on your specific unit. Do not accept a flat "yes" or "no" from a landlord — check the facts.

California's Tenant Protection Act (AB 1482), codified at Civil Code section 1947.12, caps annual rent increases at 5% plus the local change in the cost of living, or 10%, whichever is lower. For the Los Angeles / Orange County metro area, the allowable increase is 8.0% from August 1, 2025 through July 31, 2026, and 8.7% from August 1, 2026 through July 31, 2027. AB 1482 also requires "just cause" before a landlord can evict, and it applies to units that are at least 15 years old. Because the 15-year window rolls forward each year, a unit's covered/exempt status can change over time — always verify against the current date.

Here is where ADUs get tricky. Two AB 1482 exemptions matter:

• The "new construction" exemption. Any unit with a certificate of occupancy issued within the previous 15 years is exempt. Most ADUs in LA were built recently, so a large share are currently exempt on this basis alone. But this is temporary — an ADU that got its certificate of occupancy in, say, 2016 will lose the exemption 15 years later and become covered.
• The single-family / owner-occupied exemptions generally do NOT rescue an ADU. The statute expressly states that the two-unit owner-occupied exemption does not apply when either unit is an ADU or JADU. And the separate single-family-home exemption requires the property to be "separately alienable" (able to be sold on its own) — an ADU usually cannot be sold apart from the main house, so it typically does not qualify. The practical result: once an ADU passes the 15-year mark, it is often covered by AB 1482.

To check your own unit, find out (1) the date the ADU received its certificate of occupancy or final permit sign-off, and (2) whether your landlord served the required written exemption notice. For a single-family-home exemption to be valid, the landlord must give you written notice stating: "This property is not subject to the rent limits imposed by Section 1947.12 of the Civil Code and is not subject to the just cause requirements of Section 1946.2 of the Civil Code." No proper notice, no exemption. If you cannot confirm the age or the notice, assume AB 1482 may apply and treat any large rent hike or no-cause eviction with suspicion.

Separately, the City of LA Rent Stabilization Ordinance (RSO) generally covers rental units built on or before October 1, 1978, so a newly built ADU is almost never RSO-controlled. But the City of LA Just Cause Ordinance can still apply to non-RSO units, layering eviction protections on top of AB 1482. Confirm your unit's status with the LA Housing Department (housing.lacity.gov, or call 311). If your ADU is in unincorporated LA County rather than the City, the County's own rent and eviction rules (RSTPO) apply instead — check dcba.lacounty.gov.

Unpermitted ADUs, permits, and your rights

Some LA back houses and garage conversions were built or converted without permits. This does not make your tenancy illegal or strip you of tenant rights. In California, if you pay rent and occupy the unit as a home, you are a tenant with the full protections of landlord-tenant law — even if the unit itself is unpermitted.

An unpermitted unit can actually create more leverage for a tenant, because the landlord may be violating building and safety codes. But it also carries risk: if the city discovers the unit, it could order repairs or, in a worst case, order the unit vacated. If that happens, you may be entitled to relocation assistance. Do not let a landlord use "the unit isn't permitted" as a threat to make you accept illegal treatment — that argument does not erase your rights.

Habitability: your ADU must be safe and livable

Every rental in California, ADU or not, comes with an implied warranty of habitability under Civil Code sections 1941 and 1942. Your landlord must provide working plumbing, hot and cold water, heat, safe electrical, weatherproofing (no leaks), working locks, and a unit free of pests and mold. Garage conversions and older back houses sometimes fall short — poor insulation, no permitted heat source, faulty wiring, or dampness.

If your ADU has serious problems, put your request to fix them in writing and keep a copy. If the landlord ignores a reasonable request, California law gives you options: the repair-and-deduct remedy (pay for the repair yourself, up to one month's rent, and deduct it) under Civil Code 1942, or filing a code complaint. For code violations in the City of LA, contact the LA Housing Department or call 311; LAHD investigates habitability complaints. Never simply stop paying rent without legal advice — that can expose you to eviction.

Deposits, leases, and rent rules

ADUs follow the same deposit and lease rules as any California rental. As of the 2024 change to Civil Code section 1950.5 (via AB 12), a security deposit is generally capped at one month's rent, whether the unit is furnished or unfurnished. (A small-owner exception allows up to two months in limited cases.) After you move out, the landlord must return your deposit — with an itemized statement of any deductions — within 21 days. Under AB 2801, landlords face tighter rules on cleaning deductions and must document the unit's condition with photos.

A few other points for ADU renters:

• Get a written lease that names the exact unit, rent, deposit, and who pays for utilities. ADUs sometimes share a meter with the main house, so clarify utility billing up front to avoid disputes.
• Source-of-income protection. Under SB 329 and SB 267, a landlord cannot refuse you simply because you use a Housing Choice Voucher (Section 8), and must consider alternative proof of ability to pay (such as bank records). LA voucher administrators are HACLA (city) and LACDA (county).
• Entry rules. Even though the landlord may live in the main house feet away, they must give you reasonable written notice (generally 24 hours) before entering your ADU, except in emergencies.

Tenant rights recap

Renting an ADU gives you the same core protections as any tenant: a habitable home, a capped deposit and timely return, protection from source-of-income discrimination, and — depending on the unit's age and location — rent-increase caps and just-cause eviction protection under AB 1482 or a local ordinance. The biggest variable is the rent-cap question, which turns on your specific unit's age and paperwork. When in doubt, verify with LAHD (City) or DCBA (County) before agreeing to a large increase or moving out. You can also learn more in our related guides on AB 1482 rent caps and habitability and repairs.

Frequently asked questions

Can my landlord rent me an ADU while living in the main house?

Yes. It is completely legal for an owner to live in the front house and rent out the back ADU (or vice versa). Owner occupancy does not remove your tenant rights, and it does not automatically exempt the ADU from AB 1482 — the statute specifically says the owner-occupied two-unit exemption does not apply when a unit is an ADU.

Is my ADU covered by rent control?

Probably not the City of LA RSO, which mostly covers pre-October 1978 buildings, since ADUs are typically newer. But your ADU may be covered by state AB 1482 once it is 15 years old, and the LA Just Cause Ordinance may protect you against no-cause eviction even if rent caps do not apply. Confirm the unit's age and status with the LA Housing Department at housing.lacity.gov or by calling 311.

My ADU wasn't permitted. Do I still have tenant rights?

Yes. If you pay rent and live there, you are a tenant with full legal protections, regardless of whether the unit was permitted. An unpermitted unit can actually give you leverage if it violates code — though there is a risk the city could order repairs or, rarely, order it vacated, which may trigger relocation assistance.

How much can my landlord charge for a security deposit on an ADU?

Generally no more than one month's rent under Civil Code 1950.5 (as amended by AB 12), for both furnished and unfurnished units. A limited exception lets certain small owners charge up to two months. Your deposit, minus any itemized deductions, must be returned within 21 days of move-out.

The ADU has no real heat and the wiring feels unsafe. What can I do?

Your landlord must keep the unit habitable under Civil Code 1941. Request repairs in writing and keep a copy. If they are ignored, you can use the repair-and-deduct remedy (up to one month's rent) under Civil Code 1942, or file a code complaint with the LA Housing Department or by calling 311. Get legal advice before withholding rent, which can be risky.