ADU Regulations in Duarte, California (2026)

Regulations at a glance

Local rules & notes

No Development Impact Fees: The City of Duarte explicitly states it does not currently impose any development impact fees on residential construction, representing a major cost saving for ADU developers. Pre-Approved ADU Plans: The City contracts with architectural firms to provide pre-approved, customizable ADU construction plans at minimal cost to applicants to incentivize affordable rentals. Two-Story Garage ADU Exception: While detached ADUs are generally limited to 16 feet and one story, the city allows two-story ADUs when built above a detached garage.

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

Frequently asked questions about ADU regulations in Duarte

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

  In Duarte, the maximum ADU size is typically 850 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; Duarte may follow state defaults or have local limits. Verify with Duarte planning for your specific lot.

• What are the setback requirements for ADUs in Duarte?

  In Duarte, 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 Duarte planning for overlay zones or design standards that could affect your site.

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

  In Duarte, 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 Duarte or county planning for your zone.

• Is ADU approval ministerial in Duarte?

  In Duarte, 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; Duarte planning can confirm the exact process.

• Are there parking requirements for ADUs in Duarte?

  In Duarte, parking for ADUs is generally true. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Duarte planning for your address.