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Insurance for a rented ADU in California: homeowners policy or DP-3?
Published 2026-10-08 by Insurance City Agency, LLC, CA License #6003045. Reviewed by Santo Militello, California-licensed Property & Casualty agent (CA License #1737723).
Short answer: once someone pays rent to live in your ADU, the property is partly a rental, and the homeowners policy on your house was written for the house you live in. Tell your insurer before the tenant moves in. Depending on the carrier and the layout, the usual fixes are to keep the homeowners policy and add the ADU as a rented unit or structure, or to put the ADU (or the whole lot, if you move out) on a DP-3 landlord policy. Which one fits depends on three facts: whether the ADU is attached or detached, who lives in each unit, and how long the rentals run.
California made ADUs easy to permit. Under Government Code section 66315, a city or county cannot require the owner to live on the property to approve an ADU next to a single-family home. It can require rentals of 30 days or longer. That is why many Stockton, Modesto, and San Jose owners now rent both the front house and the backyard unit, or live in one and rent the other.
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What counts as an ADU or a JADU?
Government Code section 66313 defines an accessory dwelling unit as an attached or detached unit with complete independent living facilities (living, sleeping, eating, cooking, and sanitation) on the same lot as a primary home. A manufactured home can be an ADU. A junior ADU (JADU) is no more than 500 square feet and sits entirely inside a single-family home.
For a JADU, section 66333 lets the city require the owner to live in the house if the JADU shares a bathroom with it, and requires JADU rentals to be longer than 30 days. Those rules matter for insurance because the policy asks who lives where.
How a homeowners policy sees the ADU
The California Department of Insurance homeowners and renters guide describes the standard homeowners coverages. Read them with an ADU in mind:
| Coverage (CDI guide) | What the guide says | The ADU question |
|---|---|---|
| A, Dwelling | Your house and attached structures | An attached ADU, a garage conversion, or a JADU is part of the house. Was the dwelling limit raised after it was built? |
| B, Other structures | Detached structures; normally 10% of Coverage A, more can be bought | A detached backyard ADU is a second home, not a shed. Does 10% of the house limit rebuild it? |
| C, Personal property | Belongings of you and family members who live with you | The tenant's things are not yours. The tenant needs a renters policy. |
| D, Loss of use | Your extra living costs; normally 20% of Coverage A | This pays you to live elsewhere. It is not the tenant's rent. Lost rent is a separate coverage (fair rental value). |
| E, Personal liability | You or a resident of your household legally responsible for injury to others | A tenant who trips on the side-yard path is a landlord claim. Is rental activity covered on your form? |
The CDI guide also says business activities are excluded from homeowners liability and medical payments. Whether a rented ADU counts as a business activity on your policy depends on the form wording and any endorsement, not on what the unit is called. Get the carrier's answer in writing before the lease starts.
Which policy fits your ADU setup?
| Your setup | Policy conversation that usually fits | Check before the tenant moves in |
|---|---|---|
| Owner lives in the front house, detached ADU rented long-term | Homeowners on the house plus coverage for the rented ADU if the carrier offers it, or a separate DP-3 on the ADU | ADU rebuild cost vs the Coverage B amount; rental endorsement; liability for the tenant's side of the lot |
| Owner lives in the house, attached ADU or garage conversion rented | Homeowners with the rental unit disclosed; some carriers want a dwelling form | Dwelling limit updated to include the conversion; separate entrance and kitchen listed |
| JADU inside the house, owner on site | Homeowners with the roomer or tenant disclosed | Shared-bath JADU means the owner must live there (Gov. Code 66333) |
| Owner moved out, both units rented | DP-3 landlord policy on the property | Fair rental value for both units; premises liability; vacancy between tenants |
| A relative lives in the ADU rent-free | Disclose it either way | A separate unit with its own kitchen can still be treated as a second dwelling |
| Stays shorter than 30 days | A different product; your city may not allow it | See the short-term rental guide below |
Every homeowners and landlord quote we run goes to three markets, so the answer to "can this ADU stay on my homeowners policy?" comes back as real options, not a guess.
Set the rebuild limit for the ADU, not just the house
A permitted ADU is new construction. Price it like one. Use the builder's final cost or a rebuild estimate for the ADU, and set either the dwelling limit (attached) or the other-structures or separate-policy limit (detached) to match. Two California rules help once the limit is right:
- Building code upgrade. On a replacement-cost policy, Insurance Code section 10103(c) requires building code upgrade coverage of at least 10% of the dwelling limit, in addition to that limit. It helps when a rebuild has to meet a newer code.
- Combining limits after a disaster. For a covered loss tied to a declared state of emergency, section 10103.7 lets the insured combine the dwelling and other-structures limits to rebuild the main home if the dwelling limit falls short. That is a reason to keep the other-structures limit realistic even if the ADU is insured separately.
Liability, the tenant, and the lease
- Injuries on the lot. Shared driveways, side-yard paths, and stairs to a second-story ADU are where tenant injury claims start. Make sure the policy that covers the ADU carries liability for the rental, and consider an umbrella once you have two units.
- The tenant's belongings. The CDI guide says plainly that a landlord does not provide insurance for the tenant's personal property. Point the tenant to a renters policy.
- Lost rent. If a fire makes the ADU unlivable, fair rental value is the coverage that replaces the rent. Ask for it by name and give the monthly rent so the limit matches.
- Between tenants. An empty ADU can trigger vacancy wording. See vacant rental property insurance and the 60-day rule.
What to send for an ADU quote
- Address, year built for the main house and the ADU, and the ADU square footage
- Attached, detached, garage conversion, or JADU; separate kitchen and bathroom
- Permit final date and the builder's final cost, if you have them
- Who lives in each unit, the lease length, and the monthly rent
- Your current declarations page and policy form number
- Roof age, wiring, and plumbing for the main house
- Owner name, or the LLC or trust name on the deed
Our Stockton office is at 956 W Robinhood Dr, and the San Jose office is at 25 N 14th St Ste 125. For the full DP-3 picture (DP-1 vs DP-3, loss of rents, LLC named insured) read the California landlord DP-3 guide. San Jose owners can also start with landlord insurance in San Jose.
Frequently asked questions
Does my homeowners insurance cover an ADU I rent out in California?
Not automatically. The California Department of Insurance guide says homeowners liability excludes business activities and personal property covers you and family members who live with you, not a tenant. Depending on the carrier, a rented ADU is handled with an endorsement on the homeowners policy or with a separate DP-3. Tell the insurer before the tenant moves in and get the answer in writing.
Is a detached ADU covered under other structures?
A detached ADU sits under Coverage B (other structures) on a homeowners policy, which the CDI guide says is normally 10% of the dwelling limit. That amount is often far below what an ADU costs to rebuild, so the limit is raised, the ADU is scheduled, or it is written on its own policy.
Do I need a landlord policy if I live in the main house and rent the ADU?
Not always. Some carriers keep the property on a homeowners policy with the rental disclosed and endorsed; others want a DP-3 on the ADU. If you move out and rent both units, a DP-3 landlord policy is the usual fit.
Can I rent my ADU on Airbnb?
State law lets cities require ADU rentals of 30 days or longer (Gov. Code 66315), and JADU rentals must be longer than 30 days (Gov. Code 66333). Short stays are also a different insurance product. Check your city rules first.
Does my tenant need renters insurance?
The landlord's policy does not cover the tenant's belongings, according to the CDI guide. A renters policy covers the tenant's things and the tenant's own liability.
Sources
- California Government Code section 66313 (ADU and JADU definitions), section 66315 (no owner-occupant requirement; rentals of 30 days or longer), section 66333 (JADU owner occupancy with shared sanitation; JADU rentals longer than 30 days). Checked October 8, 2026.
- California Department of Insurance, Homeowners and Renters guide (Coverages A to F, Coverage B normally 10% of A, Coverage D normally 20% of A, business activities excluded, landlord does not insure the tenant's property). Checked October 8, 2026.
- California Department of Insurance, 2025 Annual Notice of significant California residential property insurance laws (Insurance Code 10103(c) building code upgrade coverage) and Insurance Code section 10103.7 (combining dwelling and other-structures limits after a state of emergency). Checked October 8, 2026.
Related
- Esta página en español
- California landlord DP-3 guide
- Landlords and rental property hub
- Vacant rental property and the 60-day rule
- Short-term rental (Airbnb / VRBO) insurance
- Duplex to fourplex insurance
- Landlord insurance in San Jose
- Stockton office
Reviewed by Santo Militello, California-licensed Property & Casualty agent (CA License #1737723). Insurance City Agency, LLC, CA License #6003045. Our licensed team brings more than 70 years of combined insurance experience. Santo Militello is the owner of Via Rapida Services. Phone (209) 670-1556. Insurance City, 956 W Robinhood Dr, Stockton, CA 95207. San Jose office: 25 N 14th St Ste 125. Last reviewed 2026-10-08.
Tell us about the ADU before the tenant moves in
A licensed agent at Insurance City Agency, LLC reads your current form, runs the property through three markets, and calls back with options. Call (209) 670-1556 or send the form. Stockton office at 956 W Robinhood Dr. Se habla español.