ADU Regulations in Nevada County, California (2026)

Regulations at a glance

Local rules & notes

HOA Interference Prohibition: Homeowners’ associations (HOAs) cannot influence or review ADU applications, as this violates State ADU Law. 60-Day Deemed Approval: ADU applications are automatically deemed approved if the local agency has not approved or denied them within 60 days. Unpermitted ADU Amnesty: Local agencies must delay enforcement against qualifying substandard ADUs for five years to allow owners to correct violations.

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

Frequently asked questions about ADU regulations in Nevada County

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

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

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

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

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

  In Nevada 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 Nevada County or county planning for your zone.

• Is ADU approval ministerial in Nevada County?

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

• Are there parking requirements for ADUs in Nevada County?

  In Nevada County, 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 Nevada County planning for your address.