ADU Regulations in Mountain View, California (2026)
Summary from local ordinance data. Verify with city planning for your specific lot.
Regulations at a glance
| Rule | Value |
|---|---|
| Max ADU Size | NaN 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
Non-Compliant Ordinance Status: The City's local ADU ordinance (No. 02.2024) is officially non-compliant with State ADU Law. HCD has directed the city to either repeal it or amend it immediately. Mandatory Use of State Law: Because the local ordinance is non-compliant, the city must process applications using State ADU Law defaults until at least the end of 2026.
For the official ordinance and latest updates, check your city or county planning department.
Frequently asked questions about ADU regulations in Mountain View
What is the maximum ADU size in Mountain View, California?
In Mountain View, the maximum ADU size is typically NaN 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; Mountain View may follow state defaults or have local limits. Verify with Mountain View planning for your specific lot.
What are the setback requirements for ADUs in Mountain View?
In Mountain View, 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 Mountain View planning for overlay zones or design standards that could affect your site.
What is the maximum height for an ADU in Mountain View?
In Mountain View, 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 Mountain View or county planning for your zone.
Is ADU approval ministerial in Mountain View?
In Mountain View, 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; Mountain View planning can confirm the exact process.
Are there parking requirements for ADUs in Mountain View?
In Mountain View, 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 Mountain View planning for your address.
Check if your specific address qualifies
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