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Glenn County, CA Building Setbacks & Zoning: Structure Height Limits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

R-1 residential structure cap
30 feet
R-1 accessory structure cap
15 feet
FA/RZ residential zone cap
35 feet
FA/RZ agricultural building cap
50 feet (barns exempt)
Lot coverage limit
40%, 30% on steep slopes
Fence/wall limit
6 feet (3 feet in front yard)
Relief path
variance under § 15.27.010

Summary

In the R-1 Single-Family Residential Zone across unincorporated Glenn County, Glenn County Code § 15.37.080 caps any residential structure at thirty feet and any accessory structure, like a shed or detached garage, at fifteen feet. The FA and RZ agricultural zones allow taller structures for barns and similar farm buildings.

These county ordinances apply to unincorporated areas of Glenn County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

The maximum building height in the R-1 zone shall be: Thirty feet for any residential structures; Fifteen feet for any accessory structures.

Full Breakdown

080: no residential structure can rise above thirty feet, and no accessory structure, like a detached garage, shed or workshop, can exceed fifteen feet. 020 to unincorporated areas with sanitary sewer and/or piped water service, or land within an established utility or district service area, so most R-1 lots sit near the county's unincorporated communities served by county utilities. 100. Height limits are not uniform countywide: the county's agricultural and recreation zones allow taller structures to accommodate farm operations. 060 sets a thirty-five-foot cap on residential structures but fifty feet for agricultural buildings, and exempts water tanks, silos, granaries, barns, pole buildings, electronic towers and antennas from the fifty-foot cap entirely.

060. A property owner planning new construction in unincorporated Glenn County should confirm the zoning designation on their parcel with the Glenn County Planning Department before assuming the R-1 thirty-foot cap applies.

Violations & Fines

Constructing a residential structure above the thirty-foot cap, or an accessory structure above fifteen feet, without first obtaining a variance under § 15.27.010 is a Title 15 violation. Glenn County Code § 1.12.010 makes a first offense an infraction, escalating to a misdemeanor for a third violation of the same requirement within 12 months, punishable under § 1.13.010 by up to $5,000 in fines, up to one year in county jail, or both.

Frequently Asked Questions

How tall can I build my house in unincorporated Glenn County?
In the R-1 Single-Family Residential Zone, Glenn County Code § 15.37.080 limits any residential structure to thirty feet. A detached garage, shed or other accessory structure on the same lot is capped at fifteen feet under the same section.
Are height limits different on agricultural land in Glenn County?
Yes. The FA Foothill Agricultural/Forestry Zone and the RZ Recreation Zone allow residential structures up to thirty-five feet and agricultural or commercial buildings up to fifty feet under §§ 15.32.060 and 15.31.060, and both exempt water tanks, silos, barns and similar farm structures from the fifty-foot cap.
What if I want to build higher than the R-1 zone allows?
You would need a variance under § 15.27.010, which the Planning Commission may grant only where a hardship tied to the property's size, shape, topography or location makes strict enforcement of the height limit unreasonable, and only if it does not authorize a use the zone otherwise prohibits.
Does the height limit apply to a detached garage or workshop too?
Yes. Section 15.37.080 sets a separate, lower ceiling of fifteen feet for accessory structures in the R-1 zone, half the thirty-foot limit that applies to the main residence.

Sources & Official References

Other rules in Glenn County

All Glenn County rules

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