Inland Empire · Zoning

Zoning rules that shape Inland Empire ADUs

State ADU law sets the floor everywhere in California. Inland Empire layers local rules on top — overlays, hillside ordinances, design districts. Here's what tends to control the envelope on a Inland Empire parcel.

Local overlays and ordinances

All cities run state ADU law floor with streamlined portals.
VHFHSZ along San Bernardino foothills, Banning Pass, San Jacinto north.
Unincorporated Riverside / San Bernardino County parcels — county processes directly.
Some specific plan areas (Eastvale, Menifee) layer on master-plan design standards.

What state law guarantees

Up to 1,200 sqft for a detached ADU on most R1 lots.
Up to 500 sqft for a JADU inside the existing footprint.
No parking requirement within ½ mile of major transit.
60-day ministerial review on a complete application.

How we map your lot

Before drawing, we pull the parcel against the county GIS, the city zoning map, and any overlay layers (HPOZ, hillside, coastal, fire). The first site walk tells us within an hour whether the project is ministerial or whether anything kicks it into discretionary review.

Reference

Terms and guides for this page

Glossary terms

Setback
Minimum distance a structure must be from a property line.
Ministerial Review
Permit review based purely on objective standards — no public hearing, no discretion.
Title 24
California's energy efficiency code — required for all new construction and most additions.
ADU (Accessory Dwelling Unit)
A self-contained second home on a residential lot, with its own kitchen, bath, and entrance.
JADU (Junior Accessory Dwelling Unit)
A smaller ADU carved out of the existing house, capped at 500 sqft, with owner-occupancy required.
FAR (Floor Area Ratio)
The ratio of total building floor area to lot size — caps how much you can build.

Field guides

The Los Angeles ADU permit process, step by step
Permitting an ADU inside the City of Los Angeles takes about 8–11 weeks of plan check (LADBS) plus 2–4 weeks of pre-submittal prep. State law caps ministerial review at 60 days from a complete submittal. Total city + utility fees for a 700 sqft detached ADU typically run $13,000–$26,000.