What a garage ADU actually rents for in San Diego

San Diego has one of the tightest rental markets in California. Vacancy rates have consistently run below 4%, and average rents have climbed steadily since 2020. For homeowners considering a garage ADU conversion, the rental income question is central: what can I realistically expect, and how long will it take to recover the conversion cost?

The answer varies significantly by neighborhood, unit size, and amenities, but the range for a permitted garage ADU in San Diego County in 2026 runs roughly $1,400-$2,800 per month for a studio to one-bedroom unit. Here is how those numbers break down.

Rent by unit type and neighborhood

Studio ADU (350-500 square feet, no separate bedroom):

This is the most common garage conversion output, fitting a two-car garage footprint with a combined sleeping and living area, a small kitchen, and a full bathroom. Studios in San Diego rent for:

  • Beach communities (Ocean Beach, Pacific Beach, Mission Beach): $1,800-$2,600/month
  • Urban central (North Park, South Park, University Heights, Normal Heights): $1,500-$2,200/month
  • East county (El Cajon, Santee, La Mesa): $1,200-$1,700/month
  • North county inland (Escondido, San Marcos, Vista): $1,300-$1,800/month
  • North county coastal (Encinitas, Carlsbad, Oceanside): $1,600-$2,300/month
  • South county (Chula Vista, National City, Lemon Grove): $1,200-$1,700/month

One-bedroom ADU (500-700 square feet with separate sleeping area):

A larger two-car garage or a garage plus a modest addition can accommodate a true one-bedroom layout. One-bedrooms command a meaningful premium over studios:

  • Beach communities: $2,200-$3,000/month
  • Urban central: $1,900-$2,600/month
  • East county: $1,500-$2,100/month
  • North county inland: $1,600-$2,200/month
  • North county coastal: $2,000-$2,700/month
  • South county: $1,400-$1,900/month

These are market-rate rents for permitted, code-compliant units. Unpermitted conversions typically rent for 15-25% less because they cannot be listed on major platforms without risk, and tenants who know they are in an unpermitted unit negotiate accordingly.

What amenities move the rent

In-unit laundry. A washer and dryer hookup (or stacked unit) in the ADU is the single amenity that most consistently moves rent. Tenants in San Diego will pay $100-$200/month more for in-unit laundry versus shared or no laundry. If the plumbing is going in anyway for the bathroom, extending it to a laundry alcove is worth the cost.

Parking. A dedicated off-street parking space for the tenant adds $75-$150/month in neighborhoods where street parking is competitive. In beachside communities, a parking space can add $200/month or more.

Private outdoor space. A small private patio or yard area attached to the ADU, separated from the main house’s yard, adds appeal and often justifies a rent premium of $100-$200/month.

Mini-split HVAC. An ADU with good climate control rents faster and reduces vacancy. In San Diego’s east county where summer temperatures are serious, HVAC is not optional for a competitive rental.

Quality finishes. Stone countertops, tile showers, and LVP flooring are the baseline expectation for upper-tier rents in central and coastal San Diego neighborhoods. Basic laminate countertops and vinyl sheet flooring reduce achievable rent by 10-15% in those markets.

How long to recover the conversion cost

A permitted garage-to-ADU conversion in San Diego typically costs $75,000-$140,000 for a two-car garage with full kitchen, bath, and mid-range finishes. At a rental rate of $1,800/month with an effective occupancy of 95%, annual gross rental income is about $20,520. Subtracting a rough estimate for maintenance, vacancy, and property management (if used), net income might run $16,000-$18,000/year.

At $80,000 conversion cost and $17,000 annual net income, the cash-on-cash recovery period is roughly 4.5-5 years. At $130,000 conversion cost, it’s closer to 7-8 years.

These are simplified estimates. The actual return depends on your financing (if you borrowed to fund the conversion, debt service changes the math significantly), your local rent level, your management approach, and whether you take advantage of California’s home office deduction rules for the portion of the property used for rental.

The property value increase from the ADU conversion is separate from the income recovery calculation. In San Diego’s market, a permitted ADU typically adds value that exceeds the conversion cost, particularly in urban and transit-adjacent neighborhoods.

Setting the rent and finding tenants

San Diego’s rental market is regulated in some ways homeowners are not always aware of. State law (AB 1482) caps annual rent increases at 5% plus local inflation (maximum 10%) for covered residential units, which includes ADUs on single-family lots that are not owner-occupied. If you plan to rent the ADU while living in the main house, confirm whether your property type is covered.

The major listing platforms (Zillow Rentals, Apartments.com, Facebook Marketplace) are all appropriate for ADU listings. A local property manager familiar with San Diego’s rental market can set the rent, screen tenants, and handle maintenance coordination for a fee of 8-10% of monthly rent, which simplifies the landlord role considerably.

Getting the conversion done

The rental income potential from a garage ADU is real, but it starts with a permitted, code-compliant conversion. Unpermitted units carry legal risk, rent for less, and complicate resale.

For a referral to insured local contractors who handle garage ADU conversions across San Diego County, visit the garage conversion service page or call (858) 925-5546.

How much can I rent a garage ADU for in San Diego?

A studio garage ADU in San Diego rents for $1,400-$2,600/month depending on the neighborhood. Urban central and coastal neighborhoods are at the top of the range. East county and south county are at the lower end.

Does an ADU need to be permitted to be rented in San Diego?

Yes. Renting an unpermitted unit as habitable space violates San Diego building and housing codes, exposes the owner to penalties, and creates risk in a tenant dispute. A permitted unit also qualifies for major listing platforms and commands higher rents.

Can I rent my garage ADU as a short-term rental in San Diego?

The City of San Diego regulates short-term rentals under its STRO ordinance. ADUs are subject to those regulations. The rules have changed frequently; confirm current requirements at sandiego.gov before listing a converted garage as a short-term rental.

Is rental income from a garage ADU taxable?

Yes. Rental income is taxable federal and California income. If you live in the primary dwelling and rent only the ADU, you may deduct a proportional share of expenses (mortgage interest, property tax, maintenance, depreciation). Consult a tax professional familiar with California rental property rules.

To get started, see our full ADU conversion service page for what the conversion process involves and how to connect with local crews.