Chino Zoning and ADU Guide for Homeowners and Sellers

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team. Information comes from the City of Chino; sources are listed at the end.

Chino allows one ADU and one junior ADU (JADU) on a lot with a single-family residence, and a JADU can be no more than 500 square feet. The city also offers preapproved detached ADU plans, and refers to Chapter 20.11 of its Zoning Code for ADU standards.

Chino ADU rules at a glance

What if my Chino ADU or garage conversion has no permit?

Call the Planning Division at 909-334-3253 with your address and ask what legalizing would involve. Unpermitted construction and garage conversions are among the issues Chino’s community preservation team lists, so see our Chino code enforcement guide.

How an unpermitted unit affects a sale

Sellers generally have to disclose known unpermitted work. On a traditional sale, buyers may ask for the unit to be legalized, removed or priced out, and lenders can be cautious about living space missing from city records. A cash buyer can purchase the property with the unit unresolved and price the risk into the offer.

How to sell a house in Chino with an unpermitted ADU

1. Check city records. See our Chino building permits guide.
2. Ask Planning. Find out what legalizing would take.
3. Compare options. Legalize, sell with a credit, or sell as-is.
4. Disclose honestly. A cash offer does not change what you must disclose.

See selling a house as-is in Chino or our cash-offer process.

Questions about your unit? Call (424) 435-2326 or request a cash offer. No cost, no obligation.

Chino’s ADU and JADU limits in plain terms

Chino allows one ADU and one JADU per lot with a single-family residence. A junior ADU is capped at 500 square feet and must be entirely inside an existing single-family home or attached garage, not in a detached structure.

That distinction matters for sellers: a converted detached garage is not a JADU under the city’s description, so it would be reviewed as an ADU.

The city lists detached ADU plans in studio, one-, two- and three-bedroom versions and also recognizes private vendor-preapproved plans, but plan check is still required either way.

The fire district is a separate step

The Chino Valley Fire District requires its own plan check application. Sellers often forget this when they trace a unit’s paperwork. If a unit was built, ask for both the city permit record and any fire district sign-off, since a buyer’s agent or lender may ask for evidence of both.

Documents to gather for an ADU sale

• City permit, inspection record and final approval.
• The plan set, including whether it was a city or vendor plan.
• Fire district plan check records.
• Utility and address records showing the unit as a separate dwelling.
• Any lease showing how the unit has been used.

Chino zoning and ADU FAQ

Can a JADU be in a detached structure in Chino?

No. The city says a JADU must be entirely inside an existing single-family home or attached garage.

Does Chino require a fire district review for ADUs?

The city page says the Chino Valley Fire District requires its own plan check application.

How many ADUs can a Chino lot have?

Per the city, a lot with a single-family residence may have one ADU and one JADU.

How big can a JADU be in Chino?

No more than 500 square feet, inside the existing single-family home or attached garage.

Does Chino have preapproved ADU plans?

Yes, detached plans in studio through 3-bedroom versions. They still need submittal, plan check and approval, with a shorter turnaround.

Can I sell a Chino house with an unpermitted ADU?

Yes, with disclosure. A cash buyer can purchase it as-is and price the risk into the offer.

Choosing an ADU path in Chino

Chino gives owners two routes: design a unit from scratch, or start from one of the city’s preapproved detached plans, which come in studio, one-, two- and three-bedroom versions. The city also recognizes plans preapproved through private vendors.

Either way plan check is still required, and the Chino Valley Fire District wants its own plan check application. Start with the Planning Division at 909-334-3253 to confirm your lot qualifies under Chapter 20.11 of the Zoning Code.

JADU versus ADU

A JADU is the smaller option: no more than 500 square feet, built entirely inside an existing single-family home or attached garage, and not in a detached structure. One ADU plus one JADU is allowed on a lot with a single-family residence. That distinction matters when you are selling, because a buyer or appraiser will want to know whether a unit is an ADU, a JADU or an unpermitted conversion.

Seller checklist for a property with an ADU

1. Pull permits and final inspection records for the unit.
2. Confirm with Planning whether the unit counts as an ADU or JADU.
3. Note any fire district sign-off.
4. Collect lease records if the unit has been rented.
5. Disclose any unpermitted work you know about.

Under Civil Code 1102.1, the transfer disclosure statement cannot be waived in an as-is sale, and a late disclosure lets the buyer cancel within three days of in-person delivery or five days of mailing. See our California as-is guide and the Chino building permits guide.

Sources

• City of Chino: Accessory Dwelling Units (ADUs)

This guide is general information, not legal advice. Rules change; confirm requirements with the City of Chino.