Ministerial Site Plan Review (ADU) — LA County Regional Planning
Ministerial Site Plan Review: The Zoning Approval You Need Before You Build an ADU in LA County If you're planning an ADU accessory dwelling unit or JADU on...
Written by 1-800-ADU-Pros
Ministerial Site Plan Review (ADU) — LA County Regional Planning
Ministerial Site Plan Review: The Zoning Approval You Need Before You Build an ADU in LA County
If you're planning an ADU (accessory dwelling unit) or JADU on a property in unincorporated Los Angeles County, there's one approval that quietly controls your whole timeline: the Ministerial Site Plan Review from the LA County Department of Regional Planning (DRP). It's the zoning green light you need before Building & Safety will issue a construction permit. Here's exactly what it is, what it costs, and how to get it without slowing your project down.
What is Ministerial Site Plan Review?
It's DRP's check that your ADU plans meet the County's objective zoning rules — height, setbacks, lot coverage, and unit-size limits. The word "ministerial" is the important part: staff compare your plans against a fixed set of standards, and if you meet them, they must approve. There's no public hearing, no neighbor input, and no discretion to reject a compliant project. (That's required by California's ADU law, Gov. Code §65852.2.) Think of it as the County's version of a zoning clearance.
Because it's ministerial, there's nothing to appeal — which works in your favor. Meet the standards and approval is essentially guaranteed.
Who needs it (and who doesn't)
This applies only to properties in unincorporated LA County. If your address sits inside an incorporated city — even one served by County services — you apply to that city instead, not DRP. Not sure? Look up your address or parcel number (APN) on the County's Z-NET tool to confirm jurisdiction.
If you are in unincorporated County, DRP recommends getting this zoning approval before you apply to Building & Safety (BSD). You can technically submit to BSD first, but they won't finalize a building permit without the planning sign-off — so leading with DRP saves you from redrawing plans.
What you'll need to file
- A completed Land Use Application, submitted as a "Regional Planning – Base Application" in the County's online portal, EPIC-LA
- A full set of architectural plans: site/plot plan, floor plans, and elevations
- Photos of your property
- For a Junior ADU, a recorded covenant — this must be in place before DRP can approve
A designer or architect isn't legally required, but a clean, standards-compliant plan set is the single biggest factor in getting through review fast.
How to file, step by step
- Confirm jurisdiction on Z-NET (unincorporated only).
- Check the rules for your zone at planning.lacounty.gov/adu; optionally call your local DRP office first (213-974-6411).
- Prepare your plans — site plan, floor plans, elevations, and property photos.
- Submit in EPIC-LA: create an account and file the Regional Planning Base Application with all uploads.
- Pay the fee once DRP deems your application complete. (Important: the review clock starts here.)
- Clear any corrections before the deadline DRP gives you.
- Download your approved plans from EPIC-LA and take them to Building & Safety.
Fees and timeline
As of the fee schedule effective March 1, 2025 (still current in 2026):
- Residential Ministerial Site Plan Review: $1,452
- Special districts (hillside, Community Standards Districts, Significant Ecological Areas, etc.): $1,937
- Time extension (one-time): $532
DRP must approve or deny within 60 days of payment. The approval is valid for 2 years, with a one-time 1-year extension available on request. You must apply for your building permit within that window.
Common pitfalls to avoid
- City vs. County mix-up. DRP only handles unincorporated parcels. Confirm on Z-NET first.
- The 60-day clock starts at payment, not when you submit — so a delayed completeness check delays everything.
- Two different clocks. After DRP approval you have 2 years to apply to Building & Safety; once BSD invoices you, you have 1 year to pay and pull the permit. Don't let either lapse.
- Special-district surprises. Hillside and CSD/ESHA parcels pay the higher fee and face extra standards — budget for both.
- JADU covenant. A Junior ADU can't be approved until the covenant is recorded.
- Missed correction deadlines can trigger an outright denial — resubmit on time.
Bottom line
Ministerial Site Plan Review is the County zoning approval that unlocks your ADU building permit. It's predictable, it's by-right, and at roughly $1,452–$1,937 with a 60-day clock, it's one of the most controllable parts of your project — as long as your plans meet the standards and you watch the deadlines.
Sources: LA County Planning – ADU page, the ADU Step-by-Step Guide, and the DRP Fee Schedule effective 3/1/2025. Verify current figures with DRP before filing.
Reference card
- Official number: No standalone form number. Filed as a "Regional Planning – Base Application – Permits & Reviews" in EPIC-LA; the fee line is "Site Plan Review, Ministerial, Residential Site Plans."
- Issuing body: Los Angeles County Department of Regional Planning (DRP). Applies to properties in unincorporated LA County only.
- What it is: Ministerial Site Plan Review is LA County's by-right (non-discretionary) zoning sign-off confirming a proposed ADU or JADU meets the County's objective development standards — height, setbacks, lot coverage/standards, and unit size. "Ministerial" means staff check the plans against fixed rules with no public hearing and no discretion to say no if the standards are met; it cannot be appealed because there is nothing to weigh. It is the County analogue to a zoning clearance and is the planning entitlement you obtain before applying to Building & Safety for a building permit. State law (Gov. Code §65852.2) requires ADU review to be ministerial.
- Who needs it: Anyone building a new ADU or Junior ADU (or converting space to one) on a property in unincorporated LA County. If your address is inside an incorporated city, you do NOT use DRP — you apply to that city instead (check your jurisdiction on Z-NET / the DPW Service Locator). DRP zoning approval is "highly recommended" before you submit to Building & Safety, because BSD will not finalize a permit without the planning sign-off. You can technically skip straight to BSD, but you risk redrawing plans if they fail zoning.
- Fees: Per the fee schedule effective March 1, 2025 (current in 2026): Site Plan Review, Ministerial, Residential Site Plans = $1,452. Properties in special districts (hillside, Community Standards Districts, Significant Ecological Areas, etc.) fall under "Ministerial, Special Districts" at $1,937. A one-time Site Plan Review Time Extension is $532. (These replaced the older $1,025–$1,252 range quoted in the 2023 step-by-step guide.) Building permit, plan-check, and agency-clearance fees are separate and charged later by Building & Safety.
- Timeline: 60 days from the date you pay the application fee for DRP to approve or deny (the clock starts at payment, not submission). Correction cycles and applicant-requested delays can extend it.
Requirements
- Confirm the parcel is in unincorporated LA County (Z-NET lookup by address or APN)
- A completed Land Use Application (submitted as the Regional Planning Base Application in EPIC-LA)
- A full set of architectural plans: site/plot plan, floor plans, and elevations
- Photographs of the property
- Plans that meet objective zoning standards (height, setbacks, lot coverage, ADU size limits)
- For a Junior ADU (JADU): a recorded covenant is required BEFORE plans can be approved
- An EPIC-LA online account to submit and receive approved plans
- Payment of the Ministerial Site Plan Review fee after the application is deemed complete
How to file
- Verify jurisdiction: enter your address or APN on the County's Z-NET tool to confirm the property is unincorporated. If it is in a city, stop and apply with that city.
- Review the rules: read DRP's ADU webpage (planning.lacounty.gov/adu) for the standards that apply to your zone; optionally contact your local DRP office (info@planning.lacounty.gov / 213-974-6411) before you draw plans.
- Prepare submittals: have a designer/architect produce a site plan, floor plans, and elevations, plus property photos.
- Apply in EPIC-LA: create an account and submit a 'Regional Planning – Base Application – Permits & Reviews.' Upload the completed Land Use Application, the architectural plans, and the photos.
- Wait for completeness check, then pay: once DRP confirms the application is complete it invoices the Ministerial Site Plan Review fee. The 60-day clock starts when you pay.
- Respond to corrections: if DRP issues plan corrections, resubmit before the stated deadline or the ADU can be denied. (For a JADU, record the required covenant before approval.)
- Receive approval: DRP approves the plans and uploads them to EPIC-LA, emailing you a link to download the approved set.
- Move to Building & Safety: use the DRP-approved plans to apply for a building permit with LA County Building & Safety (BSD) within two years.
Common pitfalls
- City vs. County confusion: DRP only handles unincorporated parcels — an in-city address must go to that city, not DRP.
- Thinking the 60 days starts at submission — it starts when you pay the fee after the completeness check.
- Skipping DRP and going straight to Building & Safety: BSD won't issue the permit without the zoning sign-off, so you may have to redraw plans.
- Letting the approval lapse: it is valid 2 years (plus one 1-year extension if requested) — you must apply for the building permit within that window or re-file.
- Confusing the two clocks: after DRP approval you have 2 years to APPLY to BSD, but once BSD invoices you have 1 year to pay and pull the building permit.
- Forgetting the JADU covenant — a Junior ADU needs a recorded covenant before DRP can approve.
- Underestimating special-district sites: hillside/CSD/ESHA parcels pay the higher $1,937 fee and face extra standards.
- Missing a correction deadline, which can trigger an outright denial.
Sources
Pre-ADU Checkup — $499 — Get finalized permits, a pre-ADU checklist, and an on-site feasibility visit. Homeowners save $1,000s by doing this before engaging a contractor.