ADU Regulations in Yountville, California (2026)

Regulations at a glance

Local rules & notes

Unpermitted ADU Amnesty: Local agencies are prohibited from denying a permit for unpermitted ADUs built before January 1, 2020, unless they are a health and safety risk. 60-Day Deemed Approval: If the city does not approve or deny a completed ADU application within 60 days, it is automatically deemed approved by operation of law. HOA and Deed Restriction Prohibition: Homeowners' associations and deed restrictions cannot prohibit or unreasonably restrict the construction or use of ADUs.

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

Frequently asked questions about ADU regulations in Yountville

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

  In Yountville, 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; Yountville may follow state defaults or have local limits. Verify with Yountville planning for your specific lot.

• What are the setback requirements for ADUs in Yountville?

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

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

  In Yountville, 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 Yountville or county planning for your zone.

• Is ADU approval ministerial in Yountville?

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

• Are there parking requirements for ADUs in Yountville?

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