Folsom, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-1-L building coverage
- 30% of lot area (§17.11.060)
- R-1-ML building coverage
- 35% of lot area (§17.12.060)
- R-1-M building coverage
- 35% of lot area (§17.13.060)
- Hillside impervious cap
- 60% of lot, buildings + paving
- Hillside waiver authority
- Planning commission (§14.33.180(A)(6))
Summary
Folsom caps how much of a residential lot a house can cover, thirty percent of lot area in the large-lot R-1-L district, rising to thirty-five percent in the medium and small-lot R-1-ML and R-1-M districts. In hillside areas, a separate impervious-surface cap of sixty percent of the lot applies to buildings and paving combined.
17.11.060 Building coverage. Maximum main building coverage in the R-1-L district is thirty percent of lot area. (Ord. 378 (part), 1979)
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 1369, passed April 28, 2026).
Full Breakdown
The Folsom Municipal Code sets maximum main building coverage district by district in Title 17 (Zoning). 060 sets the same thirty-five percent cap for the R-1-M (small-lot) district. 02 as the land area covered by all buildings on a lot, including all projections except eaves, so garages, covered porches and other roofed structures count toward the limit while eave overhangs do not. 62. 180(A)(6) imposes a separate and broader impervious-surface lot coverage standard: the total amount of impervious surface, including buildings and paving, cannot exceed sixty percent of any lot, though the planning commission may waive that limit if it finds the design consistent with the hillside chapter's purposes of erosion control and slope stability. 14 and beyond) applies to it, and hillside parcels layer the impervious cap on top of the base zoning coverage figure.
Violations & Fines
Exceeding the building coverage percentage for a lot's zoning district blocks issuance of a building permit until plans are revised to conform or a variance is granted under Chapter 17.62. In hillside areas, breaching the sixty percent impervious surface cap in Section 14.33.180 without a planning commission waiver is a violation of the hillside development standards ordinance, enforceable under the general penalty and enforcement provisions of Section 14.33.210, which can include stop-work orders and required remediation of unpermitted impervious surface.
Frequently Asked Questions
What percentage of my Folsom lot can a house cover?
Does Folsom limit impervious surface separately from building coverage?
Do eaves count toward Folsom's building coverage limit?
Sources & Official References
Other rules in Folsom
California rules heatmap·Compare Folsom to another location·View the California building setbacks & zoning overview
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Lot Coverage Limits in Nearby Cities
How other cities in Sacramento County handle lot coverage limits.