Build an ADU in the East Bay: pre-approved plans and ROI

What is an ADU?

An Accessory Dwelling Unit is an independent residential unit on the same lot as a primary home — a detached cottage, garage conversion or converted basement. Demand across the East Bay has made them one of the strongest uses of backyard space.

City pre-approved plan programs

Several East Bay cities now publish pre-reviewed ADU designs, which shortens plan check and cuts design cost.

• Oakland — pre-approved detached designs with a streamlined permit path
• Berkeley — a gallery of energy-efficient designs with reduced plan check fees
• Walnut Creek — multiple city-reviewed styles with expedited approval
• Concord — free pre-approved plans from studios to two-bedroom units, with permits issued quickly

Example plan sizes

• Studio, about 205 sq ft, 1 bath
• 1 bedroom, about 627 sq ft, 1 bath
• 2 bedroom, about 847 sq ft, 1 bath
• Styles typically offered: Craftsman, Spanish, Ranch and Modern

The ROI case

• Rental income — a 1-bedroom ADU in the inner East Bay commonly rents in the $1,800–$2,500 per month range depending on location
• Property value — an ADU can add meaningfully to value in high-demand neighborhoods
• Flexibility — family housing, home office, or renting the main house and living in the ADU
• Cost savings — pre-approved plans cut design fees and permit time

How we start

We are a design-build company. We meet you at the property, look at setbacks, utilities and access, and give you a free written proposal with options for your specific lot.