ADU Regulations in Glenn County, 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 | 5 ft |
| Rear Setback | 5 ft |
| Max Height | 16 ft |
| Approval Type | Ministerial (by-right) per Gov Code §65852.2 |
| Parking Requirements | true |
Local rules & notes
No Maximum Size Limit: Unlike most jurisdictions that cap ADUs at 1,200 square feet, Glenn County's local code at the time of the report did not specify a maximum size, allowing for larger residential structures. Manufactured Homes as ADUs: The county explicitly permits large manufactured homes to be used as ADUs under administrative permits.
For the official ordinance and latest updates, check your city or county planning department.
Frequently asked questions about ADU regulations in Glenn County
What is the maximum ADU size in Glenn County, California?
In Glenn 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; Glenn County may follow state defaults or have local limits. Verify with Glenn County planning for your specific lot.
What are the setback requirements for ADUs in Glenn County?
In Glenn County, typical setback requirements are 5 feet from the side property line and 5 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Glenn County planning for overlay zones or design standards that could affect your site.
What is the maximum height for an ADU in Glenn County?
In Glenn 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 Glenn County or county planning for your zone.
Is ADU approval ministerial in Glenn County?
In Glenn 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; Glenn County planning can confirm the exact process.
Are there parking requirements for ADUs in Glenn County?
In Glenn 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 Glenn County planning for your address.
Check if your specific address qualifies
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