ADU Guide

How Much Rental Income Can You Make from an ADU in the East Bay and Tri-Valley?

3 min read

How Much Rental Income Can You Make from an ADU in the East Bay and Tri-Valley?

One of the first questions homeowners ask when considering an ADU is whether the rental income justifies the investment. The answer depends heavily on the city, the ADU type, and the finish level. Here is a market-by-market breakdown based on current rental trends in the cities VC Renovate serves.

Antioch, CA

Antioch has experienced significant population growth and rising rents over the past five years. The opening of the Antioch BART station extension has further increased demand for housing close to transit.

Studio or one-bedroom ADU: $1,500 to $2,000 per month. Two-bedroom ADU: $2,000 to $2,500 per month. Garage conversion (400 to 500 sq ft): $1,400 to $1,800 per month.

Build cost (garage conversion): $80,000 to $120,000. Estimated payoff period at $1,600/month: 5 to 7 years.

After payoff, rental income is essentially equity-building cash flow. In Antioch, ADUs also increase property values in a market where buyers increasingly expect secondary units.

San Ramon, CA

San Ramon is one of the highest-income cities in Contra Costa County. Renters in San Ramon are typically working professionals, often employed in the tech corridor along the I-680 and Bishop Ranch area.

Studio or one-bedroom ADU: $2,200 to $2,800 per month. Two-bedroom ADU: $2,800 to $3,500 per month. Garage conversion (400 to 500 sq ft): $2,000 to $2,600 per month.

Build cost (new detached ADU): $185,000 to $260,000. Estimated payoff period at $2,500/month: 7 to 9 years.

The higher build cost is offset by higher rents, stronger property value appreciation, and the strength of the local rental market.

Dublin, CA

Dublin combines high home values, strong rental demand, and proximity to BART and tech employment. Dublin’s newer neighborhoods also feature larger lots with room for detached ADUs.

Studio or one-bedroom ADU: $2,400 to $3,000 per month. Two-bedroom ADU: $3,000 to $3,800 per month. Garage conversion (400 to 500 sq ft): $2,200 to $2,800 per month.

Build cost (garage conversion): $100,000 to $150,000. Estimated payoff period at $2,500/month: 4 to 6 years for a garage conversion.

Dublin is one of the strongest ADU markets in the Bay Area on a return-on-investment basis because garage conversions are relatively affordable and rents are strong.

How Property Taxes Are Affected

Adding an ADU does not trigger a reassessment of your existing home. Only the value of the new construction is assessed and added to your tax bill. In all three cities, the additional property tax from an ADU is typically $1,500 to $3,500 per year, which is easily covered by even one month of rental income.

The Long-Term Picture

Beyond rental income, ADUs add significant resale value. Buyers in all three markets increasingly expect and pay a premium for properties with legal, permitted secondary units. The combination of rental income during ownership and increased resale value makes ADUs one of the strongest investments available to California homeowners.

More Reading

Ready to Run the Numbers for Your Property?

VC Renovate can help you assess the ADU potential of your specific property, estimate build cost, and project rental income based on current market data. Serving Antioch, San Ramon, and Dublin. Call (925) 788-1632 or email info@vcrenovate.com. CSLB #1147209.

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