Written by Pro Value Contracting | Published on July 2025
Yes, you can absolutely rent out an ADU in California. State law explicitly allows homeowners to rent accessory dwelling units to long-term tenants, and San Diego, CA has some of the strongest local policies supporting ADU rentals in the country.
This article covers who can rent an ADU, what restrictions apply, how much rental income you can realistically earn in San Diego, and what steps to take before your first tenant moves in.
Understand California’s ADU Rental Rules
California state law, under AB 881 and SB 13, gives homeowners the right to rent out ADUs without many of the old restrictions that used to block rentals. The basics are straightforward.
- You can rent a permitted ADU to a long-term tenant (typically 30 days or more).
- You do NOT have to live on the property to rent a detached ADU, though some local rules vary.
- You can rent both your primary home and the ADU at the same time.
- Short-term rentals (Airbnb, VRBO) are treated differently and face stricter local rules.
- Junior ADUs (JADUs) require the owner to occupy either the JADU or the main home.
California removed owner-occupancy requirements for standard ADUs in 2020. This was a major shift. It means you can own the property as an investment and rent out both units without living there yourself.
One important note: your ADU must be a permitted structure. Renting out an unpermitted unit creates legal exposure and can void your homeowner’s insurance.
Know San Diego’s Specific ADU Rental Regulations
San Diego, CA has its own municipal code layered on top of state law. The city has been aggressively pro-ADU since 2017, and the local regulations mostly expand your options rather than restrict them.
Here are the key San Diego-specific rules to know before renting your ADU:
- San Diego allows ADUs citywide, including in single-family and multifamily zones.
- Short-term rentals require a separate Short-Term Residential Occupancy (STRO) license from the city.
- If you rent short-term and do NOT live on the property, you need a Tier 3 STRO license, which is subject to a cap system.
- Long-term rentals (30 days or more) do not require a STRO license.
- San Diego’s Tenant Protection Ordinance may apply to your ADU depending on its age and how long the tenant has lived there.
The City of San Diego’s Development Services Department is the right place to confirm your specific zoning and permit status before renting. Getting this right upfront saves a lot of headaches later.
Compare ADU Rental Income Potential in San Diego
San Diego is one of the highest-rent markets in California. Renting an ADU here can generate significant income depending on the unit size, location, and condition.
| ADU Type | Average Size | Estimated Monthly Rent (San Diego) |
|---|---|---|
| Studio / Junior ADU | 150 to 500 sq ft | $1,400 to $2,000 |
| 1-Bedroom ADU | 500 to 750 sq ft | $1,900 to $2,800 |
| 2-Bedroom ADU | 750 to 1,200 sq ft | $2,600 to $3,800 |
| Garage Conversion ADU | 400 to 600 sq ft | $1,600 to $2,400 |
These ranges are based on current San Diego rental market data and will vary by neighborhood. Areas like North Park, Hillcrest, and Chula Vista tend to command strong rents for well-finished ADUs.
Keep in mind that the condition of the unit directly impacts what you can charge. A clean, updated ADU with no moisture issues or deferred maintenance will lease faster and hold higher rents.
Identify What Can Disqualify Your ADU from Legal Rental
Not every ADU is legally rentable right now. Several conditions can prevent you from listing a unit without first doing some work. Here is what to check before you advertise.
| Issue | Why It Matters | What to Do |
|---|---|---|
| No building permit on file | Unpermitted units are not legally rentable | Apply for retroactive permit or legalization |
| Active water damage or mold | Habitability law requires dry, safe conditions | Remediate before any tenant moves in |
| No separate electrical panel | May not meet code for independent occupancy | Consult a licensed electrician |
| Missing smoke or CO detectors | Required by California law in all rental units | Install before leasing |
| Shared utilities without metering | Creates billing disputes with tenants | Sub-meter or establish clear lease terms |
Water damage is one of the most common disqualifying issues we see at Pro Value Contracting. Garage conversions and basement-level ADUs in San Diego are especially vulnerable to moisture intrusion, especially after winter rains.
California Civil Code requires landlords to provide habitable housing. A unit with active water damage, visible mold, or compromised structural dryness does not meet that standard.
Prepare Your ADU for Rental: A Practical Checklist
Once you have confirmed the legal side, getting the physical unit ready is the next priority. This is where many San Diego homeowners underestimate the work involved.
Here is a practical checklist to work through before your first showing:
- Verify your permit is finaled with the City of San Diego Development Services Department.
- Schedule a professional inspection to check for hidden moisture, plumbing leaks, or drainage issues.
- Address any water damage, mold, or musty odors with a licensed restoration company before listing.
- Confirm the unit has working heat, functioning windows, and proper ventilation.
- Install deadbolt locks on all exterior entry points.
- Ensure smoke detectors and carbon monoxide alarms are present and tested.
- Test all plumbing fixtures for leaks and water pressure.
- Clean and paint the interior. First impressions directly affect lease speed and rent price.
- Photograph the unit thoroughly before tenant move-in to document its condition.
If your ADU has been sitting unused, especially a garage conversion or attached unit, Pro Value Contracting recommends a moisture inspection before anything else. San Diego’s marine layer and seasonal rains can cause slow leaks that go unnoticed for months.
Understand Short-Term vs. Long-Term ADU Rentals in San Diego
The choice between short-term and long-term rental changes your regulatory requirements significantly. Most homeowners in San Diego will find long-term renting to be the simpler path.
Long-term rentals (30 days or more) offer these advantages:
- No STRO license required from the City of San Diego.
- Stable, predictable monthly income.
- Less wear and tear compared to high-turnover short-term rentals.
- Simpler tax reporting in most cases.
Short-term rentals (under 30 days) come with additional considerations:
- A STRO license from the city is required. The type depends on whether you live on-site.
- San Diego limits the total number of non-hosted short-term rental licenses through a cap system.
- You must collect and remit Transient Occupancy Tax (TOT) to the city.
- HOA rules may prohibit short-term rentals even where city law allows them.
For most homeowners building or legalizing an ADU to generate income, long-term renting is the lower-friction path. You get consistent rent without the licensing complexity.
FAQs on Renting Out an ADU in California
Do I have to live on the property to rent out my ADU in California?
No. California law removed the owner-occupancy requirement for standard ADUs in 2020. You can rent out an ADU even if you do not live on the property. Junior ADUs are the exception. JADUs require the owner to occupy either the main home or the JADU itself.
Can I rent out my ADU on Airbnb in San Diego?
Yes, but you need a Short-Term Residential Occupancy license from the City of San Diego first. The type of license depends on whether you live on-site. Non-hosted short-term rentals are subject to a city-wide cap, so availability is not guaranteed. Long-term rentals skip this process entirely.
What happens if I rent out an unpermitted ADU in California?
Renting an unpermitted unit can result in fines from the city, eviction of your tenant at your expense, and potential legal liability. It can also void relevant insurance coverage. In San Diego, you can often apply for a retroactive permit to legalize the unit before renting it out.
How much can I realistically earn renting an ADU in San Diego?
A well-finished one-bedroom ADU in San Diego typically rents for $1,900 to $2,800 per month on the long-term market. Studio and junior ADUs range from $1,400 to $2,000. Location, condition, and included utilities all affect the final number.
Does water damage in my ADU prevent me from renting it?
Yes. California habitability law requires rental units to be free of significant moisture problems and mold. Renting a unit with active water damage or visible mold creates legal liability and can result in tenant claims against you. Fix water issues before listing the unit for rent.
Are there rent control rules for ADUs in California?
Many newly built ADUs are exempt from California’s AB 1482 statewide rent control law if they were built within the last 15 years. However, San Diego has its own Tenant Protection Ordinance that may apply based on how long a tenant has lived there. Always review both state and local rules before setting rent increases.
Wrap Up and Next Steps
You can rent out an ADU in California, and San Diego homeowners have a strong legal framework and a high-rent market working in their favor. The key steps are confirming your permit status, making sure the unit meets habitability standards, and choosing long-term or short-term rental based on your goals.
If your ADU has moisture concerns, old water damage, or has been sitting vacant, get a professional assessment before your first tenant walks through the door. Pro Value Contracting serves homeowners across San Diego, CA and can help you identify and resolve water damage issues that could delay your rental or create legal exposure.
Call Pro Value Contracting at (888) 508-6580 to schedule an inspection of your ADU today. We will help you make sure your unit is dry, safe, and ready to generate income.