Unincorporated LA County ADU Regulations.

Yes. Avorino builds ADUs in Unincorporated LA County. Detached, attached, Junior ADU, and garage-conversion ADUs handled end-to-end from permits through certificate of occupancy.

Yes. Avorino carries California General-B License #1107538 and builds ADUs in Unincorporated LA County end-to-end. With Avorino as the Unincorporated LA County ADU contractor on your project, design, engineering, permits, and construction stay under one roof, so the schedule and the outcome sit with one company, not a chain of subcontractors you'd manage yourself.

Avorino handles all submissions, plan-check corrections, and approvals on your behalf. You sign once at the start; the county correspondence is ours to carry. The path: Verify homeowners association + zoning rules → Pre-application consult → Submit plans → Plan check & corrections.

From initial consultation to a fully finished, move-in ready ADU in your backyard. County plan check: 4–6+ weeks, and longer once corrections come back. Construction — typically 8–12+ weeks on a garage conversion; detached builds run several months, inside the 5–8+ month project window. Avorino carries that schedule end-to-end, from permit submission through to certificate of occupancy.

Avorino's fixed-price design-build contract covers architecture, engineering, permits, and construction. Range: $85K – $440K+.

Yes. Every Unincorporated LA County ADU on a slope >5% needs a geotechnical soils report at submittal. Avorino arranges the report during pre-design so the county doesn't bounce the application for incomplete documentation.

Roughly 30% of Unincorporated LA County hillside ADU projects need engineered retaining walls. Cost adds $25K–$75K+ depending on height and length. Avorino prices retaining into the fixed-price contract, no surprise change orders.

California state law restricts HOAs from blanket-banning ADUs, but design review (color, materials, height, slope of roof) is permitted. Avorino runs homeowners association review in parallel with county plan check.

Unincorporated LA County's hillside overlay triggers additional review on parcels >10% slope: grading limits, drainage, and view-line restrictions. Avorino's pre-design walk catches these so the design lands within the overlay envelope.

Two departments, in that order. Regional Planning confirms the plan meets zoning, including height and setbacks, and Public Works Building and Safety confirms it meets building code. Get Regional Planning approval first. The base application is filed through EPIC-LA with an Owner Acknowledgement Form and a Land Use Checklist.

Only if the lot has two means of access to a highway. Each one must be 24 ft wide excluding sidewalks, unobstructed from the lot to the highway, and built to public street standards approved by Public Works, and it must be paved in a Hillside Management Area. Those access rules do not apply to the four statewide-exemption ADU and JADU types. This is the first thing we check on a hillside parcel.

A detached ADU is capped at 1,200 sq ft. An attached unit is capped at 50% of the existing home or 1,200 sq ft, whichever is less, provided at least 800 sq ft is still allowed. A conversion entirely within an existing structure has no maximum, and up to 150 sq ft may be added for access. A junior ADU is capped at 500 sq ft. On a multifamily lot you may add up to two detached ADUs.

No. A junior ADU is not permitted on a property owned by a corporation or an LLC, and either the junior ADU or the main house has to be owner-occupied. A standard ADU carries no such ownership restriction, so the entity holding title can decide which unit type is even available to you.