ADU Regulations in Monterey, California (2026)
Summary from local ordinance data. Verify with city planning for your specific lot.
Regulations at a glance
| Rule | Value |
|---|---|
| Max ADU Size | 1200 sq ft |
| Side Setback | 4 ft |
| Rear Setback | 4 ft |
| Max Height | 16 ft |
| Approval Type | Ministerial (by-right) per Gov Code §65852.2 |
| Parking Requirements | true |
Local rules & notes
Big Sur Unit Cap: The Big Sur planning area has a cumulative numerical limit on the total number of ADUs permitted. Groundwater Protection Standards: Mandatory high-efficiency plumbing fixtures are required for all new ADUs in the North County Land Use Plan Area. Viewshed Prohibition: ADUs are strictly prohibited if they impact the Big Sur Critical Viewshed.
For the official ordinance and latest updates, check your city or county planning department.
Frequently asked questions about ADU regulations in Monterey
What is the maximum ADU size in Monterey, California?
In Monterey, 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; Monterey may follow state defaults or have local limits. Verify with Monterey planning for your specific lot.
What are the setback requirements for ADUs in Monterey?
In Monterey, 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 Monterey planning for overlay zones or design standards that could affect your site.
What is the maximum height for an ADU in Monterey?
In Monterey, 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 Monterey or county planning for your zone.
Is ADU approval ministerial in Monterey?
In Monterey, 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; Monterey planning can confirm the exact process.
Are there parking requirements for ADUs in Monterey?
In Monterey, 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 Monterey planning for your address.
Check if your specific address qualifies
Get a free feasibility report for your property — zoning, setbacks, and approval pathway.