Hawthorne, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R-1 zone lot coverage
- 50% max (single-family detached)
- UOS zone lot coverage
- 40% max, CUP can exceed
- R-1 minimum lot size
- 5,000 sq ft
- ADU coverage exception
- Can exceed zone max for ADU ≤800 sf
- Citywide violation penalty
- Up to $1,000 fine, 6 months jail
Summary
In Hawthorne's R-1 Low Density Residential zone, a single-family detached dwelling cannot cover more than fifty percent of the lot under the § 17.14.020 development table. The city's Urban Open Space (UOS) zone caps building coverage at forty percent unless the planning commission approves a conditional use permit for more.
Table of Uses and General Standards for R-1 Zone1 Minimum Lot Size Minimum Lot Width Minimum Lot Depth Minimum Front Setback2 Side Setback Interior3/Street4 Minimum Rear Setback5 Maximum Lot Coverage Maximum Building Height6 Minimum Open Space Per Unit Single-family detached dwelling 5,000 50 100 15 5/10 5 50% 22 — § 17.24.060. Lot coverage. In the UOS zone the maximum lot coverage permitted by buildings and structures, i.e., the area included within the exterior walls and/or supporting columns of all roofed structures, shall not exceed forty percent of the lot area unless otherwise approved by a conditional use permit.
Full Breakdown
Hawthorne sets its lot coverage limit zone by zone rather than citywide. 020's 'Table of Uses and General Standards for R-1 Zone' lists 'Maximum Lot Coverage' among the standards a single-family detached dwelling must meet alongside minimum lot size (5,000 square feet), lot width (50 feet), lot depth (100 feet), front setback (15 feet), interior/street side setbacks (5/10 feet), and rear setback (5 feet); the coverage figure printed for a single-family detached dwelling in that row is fifty percent of the lot. That ceiling governs the combined footprint of the house and any other roofed structures on an R-1 lot. 060.
Violations & Fines
Exceeding a zone's maximum lot coverage without either meeting the R-1 table's 50 percent limit or securing a UOS conditional use permit under § 17.24.060 is enforced by the building department under § 17.12.030, which polices construction, reconstruction, and alteration of buildings citywide. Because Title 17 carries no separate zoning fine, an over-coverage structure falls under the citywide penalty in § 1.20.010: a misdemeanor punishable by up to $1,000 and six months in jail, with each day charged as a separate offense and the condition also treated as an abatable public nuisance.
Frequently Asked Questions
How much of my Hawthorne lot can I build on in an R-1 zone?
Is lot coverage the same in every Hawthorne zone?
Can building an ADU push my lot over the coverage limit?
Sources & Official References
Other rules in Hawthorne
California rules heatmap·Compare Hawthorne to another location·View the California building setbacks & zoning overview
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Lot Coverage Limits in Nearby Cities
How other cities in Los Angeles County handle lot coverage limits.