Stevenson Ranch · ADU permits
ADU permits in Stevenson Ranch
How to build a ADU in Stevenson Ranch: permit pathway through LA County Public Works (Building & Safety), drawings required, local watch-outs, and a free address-level wizard for your Stevenson Ranch lot.
Stevenson Ranch context
Stevenson Ranch is unincorporated despite immediately adjoining Santa Clarita city limits. Permits run through LA County DPW Building & Safety at the Santa Clarita field office via EPIC-LA. Most parcels are inside master-association HOAs that layer architectural review on top of LA County's permit process. Western foothill parcels sit in the Very High Fire Hazard Severity Zone (VHFHSZ), Chapter 7A construction required.
- Permit agency
- LA County Public Works (Building & Safety)
- Median lot size
- 7,400 sqft
- ADU permits issued (2025)
- 61Source: HCD 2025 total (1,278) distributed proportionally across 2024 per-area shares. 2024: 70.
Stevenson Ranch ADU ordinance
Verified against LA County Public Works (Building & Safety)'s published ordinance on 2026-04-15. State law (CA Government Code §§ 66310-66342) overrides any locally-stricter rule.
Max detached ADU size
1,200 sqft (state default)
Max ADU height
16 ft / 18 ft with second-story setbacks
Setbacks
4 ft side / 4 ft rear (state minimum)
Permitting agency
LA County Public Works (Building & Safety), Santa Clarita field office
Not Santa Clarita city. EPIC-LA portal.
Fire-hazard construction
Chapter 7A required on VHFHSZ parcels (western foothills)
Local processing time
60 days from complete submittal (state-mandated)
Drawings you'll need to submit
Type your address. See if you can build an ADU, what kind, and exactly how to permit it.
- Site plan (parcel layout + setbacks)
- Proposed floor plan
- Elevations (each side)
- Title 24 CF1R energy compliance
PermitPathLA generates the site plan free from your Stevenson Ranch address. The other drawings come from your architect or plan firm, we list pre-approved options in the wizard.
Stevenson Ranch watch-outs for ADU
Overlays that hit a meaningful share of Stevenson Ranch lots
Very High Fire Hazard Severity Zone (VHFHSZ)~35% of parcels
Western foothill parcels. Chapter 7A construction + defensible space at final.
Master-association HOA architectural review~85% of parcels
Most parcels in master-association HOAs with architectural review on exterior changes.
Local quirks
HOA architectural review is layered on top of LA County permits
Almost every Stevenson Ranch parcel is in a master-association HOA. The HOA's architectural review layers on top of LA County's permit process. Get HOA scoping done before drafting plans.
Don't file with Santa Clarita city, it's LA County
Stevenson Ranch residents often default to Santa Clarita city for permits, then have to restart with LA County. Verify your parcel's jurisdiction.
Six Flags Magic Mountain rental-market context
Six Flags Magic Mountain is immediately west of Stevenson Ranch. Short-term rental (STR) ADU economics here are stronger than mid-SCV averages, but most master-association HOAs prohibit STRs. Verify CC&Rs.
Run your Stevenson Ranch address through the wizard
We pull your parcel polygon from county GIS, apply Stevenson Ranch ordinance + state baseline rules, generate the site plan, and walk you through the LA County Public Works (Building & Safety) submittal. Free, no signup.