Walnut Creek ADU Permits and Regulations

As of January 1, 2020 the city of Walnut Creek updated their ADU zoning to comply with the state mandate and accommodate ADU’s. Since then, there’s been high demand from Walnut Creek homeowners looking to maximize their property.

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Walnut Creek ADU Resources

City Code of Ordinances

ADU’s are discussed in Article 1, starting at Chapter 10-2.3.101

Walnut Creek’s Interim ADU regulations

These were effective starting December 17th

Rental rate trends in San Jose

The average Walnut Creek rent is $2,295, up 14% from last year

Walnut Creek’s ADU Guidebook

This was prepared January 2017 so some content is outdated, but there is helpful info in here regardless.

City Planner Info

Phone: (925) 256-3558

Financing Options

When it comes to financing your ADU, our friends at San Mateo Credit Union offer ADU Loans, reach out to one of our home specialists for an introduction!


Max ADU Size

Lot under 9,000 sqft: 600 sqft
Lot between 9,000 and 1000 sqft: 650 sqft
Lot over 10,000 sqft: 800 sqft

Front Setback


Note: Front setbacks vary by zoning, please talk to a home specialist to confirm

Primary Residence Setback 10’

Side and Rear Setback

Additional setback requirements may apply under the Building and Fire Codes or as a result of “no-build” easements or require compliance with existing easement restrictions.

Events & News

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