Lancaster vs Long Beach
How do anti-mansionization rules compare between Lancaster, CA and Long Beach, CA?
Lancaster and Long Beach have similar restriction levels.
Lancaster, CA
Los Angeles County
LA County has no countywide BMO like LA City, but Title 22 Chapter 22.110 sets hillside grading and bulk limits, and several Community Standards Districts cap floor area ratio in unincorporated communities like Altadena, La Crescenta-Montrose, and Topanga.
View full Lancaster rules →Long Beach, CA
Los Angeles County
LBMC Title 21 caps single-family floor area ratio and bulk to prevent oversized homes from overshadowing neighbors, with stricter limits in coastal and historic districts.
View full Long Beach rules →Key Facts Comparison
| Fact | Lancaster | Long Beach |
|---|---|---|
| Hillside rules | Title 22.110.090 | - |
| Altadena CSD FAR cap | 0.45 floor area ratio | - |
| Reviewing agency | Department of Regional Planning | - |
| CSD count | Roughly 20 districts countywide | - |
| Grading authority | LACoDPW Building & Safety | - |
| Base FAR | - | 0.45 to 0.55 |
| Coastal layer | - | LBMC Title 17 LCP |
| Historic overlay | - | Design review required |
| Variance route | - | Conditional use permit |
Highlighted rows indicate differences between cities.
Lancaster FAQ
Does LA County have a Baseline Mansionization Ordinance like LA City?
No. The county uses Community Standards Districts and hillside standards instead of a single BMO. Each CSD applies different FAR, height, and setback rules tailored to that unincorporated community.
How do I know which CSD covers my property?
Department of Regional Planning's Z-Net online parcel viewer shows applicable CSDs, hillside management areas, and zoning. Contact DRP before filing plans for additions in Altadena, Topanga, or other CSD areas.
Long Beach FAQ
Can I exceed the FAR with an ADU?
California ADU statutes preempt local FAR for state-mandated ADUs up to 800 square feet. Anything larger remains subject to local FAR; consult LB Development Services before planning a JADU plus ADU combo.
How are second-story step-backs measured?
From the average grade at each property line, with daylight plane angles starting at a base height set in LBMC 21.31. Staff use a sloped-plane analysis at plan check before issuing residential building permits.
Compare other topics
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