ADU Regulations in Piedmont, California (2026)

Regulations at a glance

Local rules & notes

Triple Unit Combination Allowance: HCD corrected the city's ordinance to clarify that homeowners may create one converted ADU, one detached new construction ADU, and one JADU on a single lot. Prohibited JADU Kitchen Requirements: The city cannot require JADUs to have permanently installed cooktops or specific space for a refrigerator, which reduces the cost and complexity of JADU conversions.

For the official ordinance and latest updates, check your city or county planning department.

Frequently asked questions about ADU regulations in Piedmont

• What is the maximum ADU size in Piedmont, California?

  In Piedmont, the maximum ADU size is typically 1200 square feet, depending on whether the unit is attached or detached. California state law allows up to 1,200 sq ft for detached ADUs and 800 sq ft for attached in many jurisdictions; Piedmont may follow state defaults or have local limits. Verify with Piedmont planning for your specific lot.

• What are the setback requirements for ADUs in Piedmont?

  In Piedmont, typical setback requirements are 4 feet from the side property line and 4 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Piedmont planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Piedmont?

  In Piedmont, the maximum height for an ADU is generally 16 feet. State law often allows up to 16 feet for detached ADUs and up to 25 feet when within 4 feet of the property line in some cases. Confirm with Piedmont or county planning for your zone.

• Is ADU approval ministerial in Piedmont?

  In Piedmont, ADU approval is typically Ministerial (by-right) per Gov Code §65852.2. Ministerial (by-right) review means the city must approve qualifying applications without discretionary review, per California Gov Code § 65852.2. Your project must still meet objective standards; Piedmont planning can confirm the exact process.

• Are there parking requirements for ADUs in Piedmont?

  In Piedmont, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Piedmont planning for your address.