Rental Law

California ADU Rental Laws (2026): What You Can and Can't Do

By Cathy Canales· May 29, 2026· 10 min read

If you build an ADU in California in 2026, you can rent it long-term to anyone you want under state law, and your city is broadly preempted from forbidding that. You can rent it as a short-term vacation rental (Airbnb-style) only if your specific city allows it, and you cannot rent it for less than 30 days in many jurisdictions. California also no longer requires you to live in the main house to rent the ADU, the state’s 2020 reforms removed local owner-occupancy mandates statewide.

The most important practical detail: California’s ADU rules are state-protected (Gov Code §65852.2), and local ordinances that try to restrict ADU rental beyond what state law allows are generally unenforceable. But cities still control short-term rental (STR) rules, fire safety, and zoning overlays in special districts (coastal, historic). Verify locally before you list.

The short version: Long-term rentals (30+ days): allowed statewide, no owner-occupancy required. Short-term rentals (<30 days): only if your city explicitly allows STRs for ADUs. AB-1033 (effective 2024): some cities now let you condo-ize your ADU and sell it separately. Standard CA tenant protections apply once a tenant moves in.

What state law guarantees (and overrides local rules)

California’s ADU statute makes several rental rights automatic and locally unblockable:

No owner-occupancy requirement. Cities CAN’T require you to live in the main house to rent out the ADU. This was reformed in 2020 and applies to all ADUs permitted after January 1, 2020. (ADUs permitted before that date may still have a deed-recorded owner-occupancy covenant, check yours.)
No discrimination against tenant household structure. Standard CA fair-housing law applies, you can’t refuse to rent based on family status, source of income, etc.
Long-term rental is by-right. Cities can’t require additional permits or fees specifically for renting your ADU long-term (30+ days).
Streamlined approval applies to rental-purpose ADUs. The 60-day ministerial review applies whether you plan to rent or have family live there. The state doesn’t care which.

What cities still control

Cities still write local rules on:

Short-term rentals (<30 days). Most California cities now restrict or ban ADU short-term rentals (Airbnb, VRBO). Examples we routinely deal with:
- Santa Cruz: No new short-term rentals in residential zones.
- Los Gatos: STRs banned in single-family neighborhoods.
- Salinas / San Jose: STRs allowed with permits and limits (~30 to 60 days/year max for some ADUs).
- Carmel-by-the-Sea: Extensive STR regulations, primary-residence-only rules.
- Marina: Coastal Commission overlay, STRs restricted near coast.
Specific lease-length minimums. Many cities require 30+ days for ADUs in any rental arrangement.
Parking exemption proof. If you’re claiming the transit-parking exemption, the city verifies you’re within the half-mile boundary.
Coastal Commission rules. Coastal cities (Aptos, Capitola, Marina, Pacific Grove) have extra approvals for rentals that fall within the Coastal Zone.

Always check your specific city’s planning website or call the planning department before listing your ADU for rent. It takes 10 minutes and prevents major headaches.

Long-term rental: the rules you’ll actually deal with

For the most common scenario, you’re renting your ADU on a year or month-to-month lease to a single tenant or family, here’s the practical playbook for California:

Lease basics

Minimum term: California has no state minimum, but most cities require 30+ days for ADUs.
Written or verbal: Either is legally binding for terms under one year; written required for one year or more.
Security deposit cap: Two months’ rent for unfurnished, three months for furnished (Civil Code §1950.5). New 2024 rule: down to one month for landlords with 1 to 2 rental units.
Last month’s rent: You can collect, but it must be returned or applied to the actual last month.

Annual rent increase limits (Tenant Protection Act / AB 1482)

California’s statewide rent cap applies to most ADUs after 15 years of certificate of occupancy. Until then, you can raise rent freely (subject to local ordinances, see below). After 15 years:

5% + local CPI, max 10% per year (whichever is lower).
You must serve proper notice (30 days for increases ≤10%, 90 days for >10%).
Local cities can have stricter caps that override the state cap.

Just-cause eviction (AB 1482)

After a tenant has lived in the unit for 12+ months (or 24+ months if there are multiple tenants), you can only evict for specific “just causes”, non-payment, lease violations, owner move-in, withdrawal from rental market, etc. You can no longer evict simply because the lease ended for tenants past that threshold. (ADUs in your primary residence have a partial exemption, see below.)

Owner-occupancy exemption for AB 1482

If the ADU is on the same property as your primary residence AND you live in either the main house or the ADU, AB 1482’s rent cap and just-cause eviction rules may not apply. This is one of the few perks of an owner-occupied ADU rental. Talk to a CA landlord-tenant attorney to confirm for your specific setup.

Required disclosures (CA state mandates)

You must disclose to tenants:

Lead paint (pre-1978 buildings only, doesn’t apply to new factory-built ADUs).
Mold history.
Bedbug history.
Death in the unit within the last 3 years.
Sex-offender registry information.
Wildfire-hazard zone (CA Civil Code §2079.10a), applies to most California areas now.

Short-term rental (Airbnb / VRBO): mostly restricted

If your ADU dream included Airbnb income, adjust expectations. The state’s 2020s housing-pressure reforms hit short-term rentals hard. Most California cities now require:

30-day minimum stay for any ADU rental (effectively banning Airbnb-style listings).
Primary-residence-only STRs (you must live on the property; the ADU can be the rental only if the main house is your home).
STR permits with annual caps (e.g., max 90 days/year of STR use).
No new STR permits in saturated tourist areas (Santa Cruz, Carmel, parts of Monterey).

The financial math also rarely works out: long-term rental on a 660 sq ft 2BR yields $2,400 to $2,800/mo = $28,800 to $33,600/year of gross rent without any of the cleaning, turnover, marketing, or vacancy hassle of STR. STR has to clear about $90 to $130 per night with 75% occupancy to beat that, which is achievable only in tourist coastal markets where it’s also most heavily regulated.

Plan for long-term rental as your base case. Treat STR as an upside only if your specific city allows it and your specific location makes the nightly rates work.

AB-1033: condo-ize and sell your ADU separately

A 2024 California law (AB-1033) lets local cities allow ADUs to be converted to condominiums and sold separately from the main house. This is huge, it gives ADUs the same financial structure as a townhome unit, which dramatically increases their financeability and resale value.

Status as of 2026: AB-1033 is opt-in at the city level. Each city has to pass its own ordinance authorizing condo-ization. As of early 2026, the cities in our service area that have adopted or are actively considering AB-1033 ordinances:

San Jose: Adopted. ADUs can be condo-ized after meeting standard subdivision requirements.
Santa Cruz: Considering. Public comment period open.
Salinas: Not yet adopted as of 2026.
Los Gatos / Los Altos: Considering.
Carmel / Pacific Grove: Not adopted (coastal-zone complications).

If condo-ization is part of your long-term strategy (e.g., build the ADU now, sell it separately in 10 years to fund retirement), check with your city’s planning department about their AB-1033 timeline. We track this for all our service-area cities in our feasibility study. For a deeper walkthrough of the conditions, lender consent, and how it affects value, see our full guide on whether you can sell an ADU separately in California.

Tax implications of renting your ADU

Quick overview, for the full picture talk to a CPA.

Rental income is taxable. Reported on Schedule E (federal) and FTB Form 540 (CA).
Operating expenses are deductible, property tax (proportional to the ADU’s share), insurance, utilities you pay, maintenance, depreciation.
Depreciation is one of the biggest deductions: roughly 1/27.5 of the ADU’s cost per year as a paper loss against rental income. On a $287K ADU, that’s about $10,400/yr in depreciation, often enough to make rental income tax-free for many years.
At sale: Depreciation recapture applies (you pay tax on the depreciation you took), and any gain above your basis may be capital gains. Primary-residence exclusion ($250K single, $500K married) applies to your portion if it’s still your residence.
Property tax: Only the ADU is reassessed, your main home’s Prop 13 basis is unchanged. See our property-tax guide.

Renting to family members

A common scenario: you build the ADU primarily for an aging parent or adult child, but you also want the “family rent” they pay to count toward something useful (paying down your HELOC, depreciation deduction, etc.). California allows this, with a catch:

Below-market rent (less than fair market value) means the IRS treats the ADU as a personal use, not a rental. You lose the rental-income deductions (depreciation, etc.) for any month you charge below-market rent.
At-or-above-market rent keeps it a rental for tax purposes. You can charge a family member full market rent and it works the same as renting to a stranger.
A reasonable middle path: Charge fair-market rent and have a side agreement to gift back any “surplus” they paid. Talk to a CPA, the structure matters.

Tenant insurance and your insurance

When you rent your ADU:

Get a landlord rider on your homeowner’s policy. Most carriers offer one for a small premium increase. Without it, your policy may not cover damage from tenants.
Require renter’s insurance in the lease. Covers their property and provides liability protection that benefits you indirectly.
Notify your mortgage lender if you have one. Most have no problem with a single rented ADU, but a few have rental restrictions in their loan covenants.

Setting your rent

For Framework First clients, rough rent guidance by ADU size in our service area as of 2026 (verify with local Zillow Rent Index):

Model	Sq Ft	Beds	Salinas/Marina	San Jose / Los Altos / Los Gatos
Four Fifty	450	Studio	$1,700 to $1,900	$2,200 to $2,600
Six Sixty	660	1 BR	$2,000 to $2,400	$2,800 to $3,400
Six Sixty 2BR	660	2 BR	$2,400 to $2,800	$3,200 to $3,800
Nine Forty-Five	945	2 to 3 BR	$2,800 to $3,300	$3,800 to $4,500
Twelve Hundred	1,200	3 BR / 2 BA	$3,200 to $3,800	$4,400 to $5,200

These are realistic 2026 ranges for new-construction quality with parking. Older neighborhoods and exact zip codes vary. See our full ADU rental income guide for the math by config and city.

Bottom line

California’s rental rules favor ADU owners more than at any point in the last 40 years. Long-term rental is by-right, no owner-occupancy required, and you keep your Prop 13 main-home assessment. The big constraint is short-term rentals (Airbnb-style), which most cities have restricted, plan for long-term rental as the base case.

If you’re planning to rent your ADU, we’ll flag city-specific rules in your feasibility study and connect you with our financing partners (Mason Mac and SearchLight Lending) to structure a loan that assumes rental income as part of your debt-coverage ratio.

This guide is general information, not legal advice. For your specific property, lease, or eviction question, consult a California landlord-tenant attorney. Ready to run the rental ROI numbers for your address? Use the ROI calculator, it pre-fills median rent by zip code.