ADU Regulations in Chino Hills, California
Everything you need to know about building an ADU in Chino Hills — size limits, setbacks, permits, and costs.
How many ADUs are allowed in Chino Hills?
- → 1 Detached ADU (up to 1,200 sq ft)
- → 1 Attached ADU
- → 1 Junior ADU / JADU (up to 500 sq ft)
- → Up to 8 detached ADUs
- → Interior conversions up to 25% of existing units
All California cities must follow state-law minimums. Chino Hills follows California AB 68 and subsequent ADU laws.
Chino Hills ADU rules & limits.
| ADUs Allowed | Up to 3 units on a single-family lot (primary home + 1 ADU + 1 JADU); up to 8 detached ADUs on multifamily lots |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Setbacks | 4 ft side & rear (CA state baseline) |
| Height | 16 ft detached |
| Parking | Not required in most cases; no replacement parking for garage conversions |
| JADU Allowed | Yes — up to 500 sq ft; owner-occupancy required if JADU is present |
| Impact Fees | Waived under 750 sq ft (state law) |
| Permit Timeline | 60 days maximum (state-mandated review window) |
Hillside lots — common throughout Chino Hills — may have additional grading, retaining wall, and slope-stability engineering requirements that affect detached ADU placement and cost.
Contact: Chino Hills Planning: (909) 364-2822
What could your Chino Hills ADU earn?
Rental estimates based on current Inland Empire market rates. Actual rents vary by condition, amenities, and local demand.
Four paths to an ADU in Chino Hills.
From idea to reveal.
Free Feasibility Consultation
We walk your lot, check setbacks and lot coverage, and confirm what your jurisdiction will approve.
Design & Engineering
Floor plan, elevations, structural calcs, and Title 24 energy compliance — drawn for your specific lot.
Permit Submission & Approval
We submit to your city or county, manage plan-check corrections, and pay the permit fees.
Construction
Same Construction Station crew handles foundation, framing, MEP, drywall, and finish — start to keys.
Final Inspection & Move-In Ready
Final city inspection, certificate of occupancy where applicable, and two-year workmanship warranty.
Why build an ADU in Chino Hills.
Chino Hills has the highest median home values of any city profiled in our service area, and ADU appraisal lift here tracks accordingly. Long-term rental demand is among the strongest in the western Inland Empire — proximity to Diamond Bar, Brea, Fullerton, and the broader Orange County job market means tenant pool quality and rent levels are exceptional. The newer master-planned subdivisions have modern electrical service, modern sewer connections, and standardized architectural character that keeps ADU construction predictable. The main strategic consideration is hillside grading and retaining wall engineering — many parcels require additional structural work compared to flat-site ADU construction, which we account for in the fixed-price contract. Chino Hills State Park views and the overall semi-rural feel of much of the city also support strong rents for well-finished ADUs.
Ready to build an ADU in Chino Hills?
We’ll walk your lot, confirm what Chino Hills will allow, and ballpark cost before you commit to anything.
Chino Hills ADU questions, answered.
How much does an ADU cost in Chino Hills?
How long does it take to get an ADU permit in Chino Hills?
Can I rent my ADU in Chino Hills?
Do I need owner-occupancy for an ADU in Chino Hills?
Does Construction Station build ADUs in Chino Hills?
ADU regulations change frequently. Always verify current requirements with the Chino Hills Planning Department at (909) 364-2822. This page was last updated May 2026.