Pomona, CA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- Measurement method
- Perpendicular to each lot line, Sec. 370.C.4
- Alley setback
- Applies only to the ground story
- Architectural detail encroachment
- Up to 2 feet into any setback
- Roof projection encroachment
- Up to 2.5 feet, 2.5 feet min from side/rear
- Unenclosed ground-story structure
- Up to 7 feet into street setbacks
- Relief route
- Variance required under Sec. 1160.E
Summary
Every building and structure in Pomona must sit on or behind minimum primary street, side street, side, rear and alley setbacks measured perpendicular from each lot line, with the exact distance set by the lot's Form Module. Limited architectural, roof and unenclosed-structure encroachments are allowed under Sec. 370.C.5.
370.C. Building Setbacks. The area on a lot not intended for buildings and structures. Includes primary street setbacks, side street setbacks, side setbacks, rear setbacks, alley setbacks, and special lot line setbacks...Building setbacks apply only to the perimeter edges of a lot. Building setbacks do not apply to individual lots that are part of a larger lot...All building setbacks are measured perpendicular to the applicable lot line...a. A primary street setback is measured from the primary street lot line. b. A side street setback is measured from the side street lot line. c. A side setback is measured from the side lot line. d. A rear setback is measured from the rear lot line...e. An alley setback is measured from the alley lot line and only applies to the ground story...No encroachment is allowed within any public right-of-way.
Full Breakdown
Sec. C, Building Setbacks, defines the setback as the area on a lot not intended for buildings and structures, covering primary street, side street, side, rear, alley and special lot line setbacks. It applies to all buildings and structures on a lot unless an exception applies, but setbacks apply only to a lot's perimeter edges, not to individual lots that are part of a larger lot. All setbacks are measured perpendicular to the applicable lot line: a primary street setback from the primary street lot line, a side street setback from the side street lot line, a side setback from the side lot line, and a rear setback from the rear lot line.
On triangular or gore-shaped lots the rear lot line is instead determined using a line 10 feet wide, parallel to the primary street lot line, that intersects two lot lines at its endpoints. An alley setback is measured from the alley lot line and applies only to the ground story. Sec. 5 lists horizontal encroachments allowed to intrude into the required setback, with no encroachment permitted within any public right-of-way: architectural details (Sec. 5 feet from side/rear lot lines; roof projections (Sec. 5 feet under the same lot-line minimums; and unenclosed ground-story structures (Sec. 5 feet from side/rear and alley lot lines.
Violations & Fines
A building or structure placed forward of its required minimum setback, without qualifying for one of the Sec. 370.C.5 encroachment exceptions, is nonconforming under the Zoning and Development Code. Because building setbacks apply only to a lot's perimeter and setback distances are fixed per Form Module, no citywide flat distance applies to every zone; any increase beyond the allowed encroachments requires a variance under Sec. 1160.E before the City will approve construction closer to a lot line.
Frequently Asked Questions
How is a Pomona building setback measured?
Can a porch project into my Pomona setback?
Does the setback apply to interior lots within a larger development?
What if I need to build closer than the allowed encroachment?
Sources & Official References
Other rules in Pomona
California rules heatmap·Compare Pomona to another location·View the California building setbacks & zoning overview
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