Glenn County, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Standard max coverage
- 40% of lot area
- Coverage on slopes over 30%
- 30% of lot area
- Zone
- R-1 Single Family Residential
- Enacted by
- Ord. 1200 § 3, 2008
- Reviewing agency
- Planning and Building Department
Summary
In the R-1 Single Family Residential zone of unincorporated Glenn County, buildings and structures cannot cover more than 40 percent of a lot, and that ceiling drops to 30 percent on parcels where slopes exceed 30 percent.
The maximum lot coverage shall be 40% of the total lot area. For areas where slopes are greater than 30%, lot coverage shall not exceed 30%.
Full Breakdown
110, in the R-1 Single Family Residential Zone chapter, sets the coverage ceiling in a single sentence: 'the maximum lot coverage shall be 40% of the total lot area,' with a reduced 30 percent ceiling for areas where slopes are greater than 30 percent. The lower slope-based figure reflects the county's grading and erosion concerns on hillside parcels within the R-1 district, forcing a smaller building footprint where steep grades increase runoff and slope-stability risk. This coverage figure was added by Ordinance 1200 Section 3 in 2008, layered onto the R-1 zone's earlier 2006 Ordinance 1183 framework that set the zone's yard and height standards. 080, so the ratio is the county's general residential and commercial coverage benchmark rather than a one-off R-1 number. 13.
Violations & Fines
Constructing a building or structure that pushes total lot coverage above 40 percent (or 30 percent on qualifying steep-slope parcels) without an approved variance is a zoning violation. The county can deny a building permit or certificate of occupancy for a project that exceeds the ratio, and an already-built violation is subject to the code's enforcement and abatement procedures under Title 15.
Frequently Asked Questions
What is the maximum lot coverage in Glenn County's R-1 zone?
Is the coverage limit lower on a hillside lot?
Does this coverage rule apply outside the R-1 zone?
Sources & Official References
Other rules in Glenn County
California rules heatmap·Compare Glenn County to another location·View the California building setbacks & zoning overview
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