Chino Hills ADU Permit Checklist - City Requirements

Applying for an accessory dwelling unit (ADU) permit in Chino Hills, California begins with understanding local building and planning requirements and the permit workflow. This checklist explains which permits and reviews you typically need, which city departments enforce standards, where to find required forms, and common compliance issues to avoid. Use the steps below to prepare drawings, confirm zoning and utility connections, submit applications, and track inspections so your ADU meets Chino Hills building and planning rules.

What to check before you apply

• Confirm your lot zoning and ADU eligibility with the Planning Division; check required setbacks and maximum ADU size.
• Decide whether the ADU is attached, detached, or conversion and prepare preliminary plans showing floor area and access.
• Verify existing utilities and whether new water, sewer, or electrical connections are required.
• Review objective design standards and any local overlay or neighborhood protections that apply to your property.

For official program details and zoning confirmation contact the City of Chino Hills Planning Division or consult the municipal code and permit center before preparing final construction documents. City ADU guidance^[1]

Permit application steps

1. Prepare site plan, floor plans, elevations, and structural notes; include utility connections and grading where applicable.
2. Submit a building permit application to Building & Safety with required documents and owner/contractor information. Building permit procedures^[2]
3. Undergo plan review for code compliance (California Building Code, local amendments) and respond to plan check comments.
4. Pay plan check and permit fees as determined by the Building Division at submittal or prior to permit issuance.
5. Schedule required inspections during construction and obtain final approval before occupancy.

Penalties & Enforcement

The City enforces ADU and building rules through plan review, permit approval, inspections, and code enforcement if work occurs without permits or deviates from approved plans. Enforcement may include administrative citations, stop-work orders, civil penalties, and court actions depending on the violation and enforcement path chosen by the city.

• Monetary fines: specific fine amounts for unpermitted ADU work are not specified on the cited pages; consult Code Enforcement and the municipal code for amounts and schedules.
• Escalation: first and repeat offence procedures and per-day continuing penalties are not specified on the cited pages.
• Non-monetary actions: stop-work orders, correction notices, required demolition or alteration to achieve compliance, and referral to court are available remedies.
• Enforcer: Code Enforcement and Building & Safety divisions handle investigations, inspections, and citations; report violations to Code Enforcement via the city contact pages.
• Appeals: appeal or review routes depend on the decision type (plan check denial, citation); time limits for appeals are not specified on the cited pages and should be confirmed with the issuing department.
• Defences/discretion: permits, variances, or after-the-fact permits may be available; discretionary relief processes are governed by Planning or Building rules and are fact-specific.

Applications & Forms

The city publishes building permit applications and submission checklists through the Building & Safety division; specific form numbers and fee schedules are available on the Building & Safety permit page or the municipal code. If a specific ADU form number is not published, use the standard building permit application and attach required ADU documents. Chino Hills municipal code^[3]

Common violations

• Constructing an ADU without a building permit.
• Failing to meet setback, height, or parking standards required by zoning.
• Altering utility connections without inspection or required permits.

FAQ

Do I always need a permit to build an ADU in Chino Hills?

Yes. Building permits and plan review are required for new construction or conversion of structures to an ADU; contact Building & Safety and Planning for project-specific guidance.

How long does plan review and permitting typically take?

Plan review and permitting timelines vary by project scope and department workload; specific timelines are not specified on the cited pages—confirm current review times with the Planning and Building divisions.

Where do I submit an application?

Submit applications to the City of Chino Hills Building & Safety/Permit Center using the procedures on the Building & Safety permits page. Permit procedures

How-To

1. Confirm ADU eligibility and zoning requirements with the Planning Division.
2. Prepare and submit completed plans and the building permit application to Building & Safety.
3. Pay plan check and permit fees and respond to review comments.
4. Schedule inspections during construction and obtain final approval and certificate of occupancy.

Key Takeaways

• Confirm zoning and ADU type early with Planning.
• Submit complete plans to Building & Safety to avoid delays.
• Contact Code Enforcement immediately if work was started without permits.

Help and Support / Resources

• City of Chino Hills - Planning Division
• City of Chino Hills - Building & Safety
• City of Chino Hills - Code Enforcement

1. [1] City of Chino Hills ADU guidance and planning contact information.
2. [2] City of Chino Hills Building & Safety permit procedures and submittal information.
3. [3] Chino Hills municipal code (code of ordinances) – authoritative local regulations.