Need a site plan or a stormwater design in Los Angeles County, CA? Los Angeles County has about 9,757,179 residents (2024 estimate) and 88 incorporated cities and towns. Describe your project once: licensed civil engineers who work in Los Angeles County get back to you.
Site plan review in Los Angeles County is handled by each city, or by the county in unincorporated areas.
Services available in Los Angeles County
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Site plan, grading and utilities
Civil site plan with grading, utilities and access, sealed by a licensed engineer for the permit.
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Stormwater and drainage design
Drainage calculations and stormwater management design required by the city, county or state.
Frequently asked questions in Los Angeles County
Do licensed civil engineers cover the whole of Los Angeles County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Civil Engineering Site Plans in California: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.