ADU Regulations in Mono County, California (2026)

Regulations at a glance

Local rules & notes

State Law Supremacy Clause: The ordinance explicitly states that if local Chapter 16 regulations conflict with California state ADU law, state law takes precedence. Discretionary Fee Deferral: Developers may apply to defer the payment of county fees until the certificate of occupancy is issued rather than paying at the time of permit issuance. Reduced Site Development Standards: The County may consider reductions in setbacks, lot coverage, and parking requirements if the developer provides evidence that such reductions are necessary to meet affordable housing goals.

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

Frequently asked questions about ADU regulations in Mono County

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

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

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

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

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

  In Mono County, 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 Mono County or county planning for your zone.

• Is ADU approval ministerial in Mono County?

  In Mono 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; Mono County planning can confirm the exact process.

• Are there parking requirements for ADUs in Mono County?

  In Mono County, 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 Mono County planning for your address.