Building an ADU is both a lifestyle upgrade and a financial investment. Our ADU Cost & Investment Return Calculator helps you estimate construction costs based on real project averages, and calculates your potential rental income and long-term ROI. Whether you’re creating a rental unit, a guest suite, or a multigenerational living space, this tool gives you a data-driven view of what to expect.
Enter Information About Your Property:
Enter the current square footage of your main residence.
Enter the desired square footage of the ADU you would like to build on your property.
Enter the current monetary value or your home. We recommend using an online home value estimator (found on Zillow, Redfin, Rocket Homes, etc.)
Calculated Results
Immediate Investment & Value
Calculated Results
Long Term Investment & Value
Estimate Your ADU Cost & Long-Term ROI
ADUs have unique construction, permitting, and design requirements. This calculator factors in the key variables that affect both upfront costs and future return on investment.
This ADU calculator is perfect for:
- Evaluating the cost of a detached, attached, or garage ADU
- Comparing ADU construction options
- Calculating rental income potential
- Determining long-term ROI and equity gains
- Understanding whether an ADU is a profitable investment
What Impacts the Cost of Building an ADU?
Square Footage & Building Type
Detached ADUs typically cost more than garage conversions or attached units. The footprint and layout strongly influence total investment.
Utility Extensions & Infrastructure
ADUs often require new plumbing lines, electrical panels, sewer connections, and HVAC systems.
Permits & Zoning Requirements
Local regulations can affect pricing and timelines. Your estimate includes average permitting and planning costs.
Interior Finishes & Upgrades
Everything from cabinetry to flooring to appliance packages impacts the final cost.
ROI & Rental Income Potential
One of the greatest advantages of an ADU is its ability to generate ongoing income. This calculator estimates:
- Monthly rental income
- Annual rental revenue
- Projected return on investment
- Estimated payback period
Useful whether you plan to rent long-term, accommodate family, or eventually resell with added equity.
Use the Calculator Below
Enter your ADU details to instantly see construction cost, rental projections, and total ROI.
Ready to Explore Your ADU Options?
Once you review your estimate, our team can walk you through feasibility, zoning rules, design options, and financing considerations so you can maximize both livability and return.
Book your ADU planning consultation here
Build an ADU With Confidence
ADUs remain one of the smartest property investments in California. Use this calculator as your first step toward understanding cost, value, and long-term financial performance.
Ready to talk to the ADU experts?
Questions? Let’s talk.
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Specialty Design Build
243 S. Escondido Blvd #308
Escondido, CA 92025
(858) 759-7400 San Diego
(760) 738-6270North County
243 S. Escondido Blvd #308
Escondido, CA 92025
(858) 759-7400 San Diego
(760) 738-6270North County
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Areas Served
San Diego • Rancho Santa Fe • Carlsbad • Carmel Valley • Del Mar • La Jolla • Pacific Beach • Oceanside • San Marcos • Vista • Rancho Bernardo • Poway • Valley Center • Encinitas • Escondido
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