ADU Regulations in Lake County, California (2026)

Regulations at a glance

Local rules & notes

Subjective Design Review: The City imposes subjective criteria such as 'Consistent with overall architectural design' and 'Compatible', which HCD flagged as non-compliant with the requirement for objective standards. JADU Garage Restriction: The City ordinance incorrectly requires JADUs to be within the existing walls of the residence, excluding attached garages. HCD clarified that attached garages must be allowed for JADU creation. Multifamily ADU Minimum: The City limited multifamily ADUs to 25% of existing units but failed to include the state mandate allowing 'at least one' unit, which blocks ADUs in 2-3 unit buildings.

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

Frequently asked questions about ADU regulations in Lake County

• What is the maximum ADU size in Lake County, California?

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

• What are the setback requirements for ADUs in Lake County?

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

• What is the maximum height for an ADU in Lake County?

  In Lake County, the maximum height for an ADU is generally 17 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 Lake County or county planning for your zone.

• Is ADU approval ministerial in Lake County?

  In Lake County, 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; Lake County planning can confirm the exact process.

• Are there parking requirements for ADUs in Lake County?

  In Lake County, 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 Lake County planning for your address.