Claremont Zoning and ADU Guide for Homeowners

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team.

Claremont allows accessory dwelling units and publishes development standards for both ADUs and junior ADUs, including a 4-foot minimum setback and a 16-foot height limit. This guide summarizes the city’s published ADU standards, the application checklist, and what an ADU or a garage conversion means when you sell.

Claremont ADU standards at a glance

Department	Planning Division, City of Claremont, (909) 399-5470
ADU size	Minimum 150 sq ft, maximum 1,000 sq ft
JADU size	Minimum 150 sq ft, maximum 500 sq ft, connected to the primary dwelling
Setback from property line	Minimum 4 feet
Maximum height	16 feet
Design	Windows, color, materials and roof must match the primary dwelling
Pre-approved designs	The city publishes a page of pre-approved ADU designs

Design and construction standards

The city says all exterior features of an ADU or JADU, including windows, color, materials and roof, must match the primary dwelling. Both types of unit have a 150-square-foot minimum and a 16-foot height limit. A detached or attached ADU may be as large as 1,000 square feet, while a JADU is capped at 500 square feet and must be connected to the primary dwelling.

Where an ADU or JADU is less than 8 feet from a property line, the city says the sides facing that line may not have exterior entrances and may not have windows lower than six feet above ground level.

Kitchen requirements

The city lists kitchen minimums that depend on unit size. Units over 500 square feet need a 22-inch sink with garbage disposal, an opening for a refrigerator measuring 69 by 30 by 29 inches, a four-element stove and 15 square feet of counter space. Units under 500 square feet need a 15-inch sink with garbage disposal, an opening for a 62 by 25 by 28 inch refrigerator, a two-element 120-volt electric stove and 10 square feet of counter space.

What to submit

Claremont’s checklist asks for a complete application with the property owner’s notarized signature, a site plan showing all existing and proposed structures, parking and existing mature trees, a floor plan of the ADU (and of the existing structure if converting), elevations, specifications for roof materials, windows, exterior doors and exterior fixtures, photos of the primary residence, and a preliminary title report.

It also asks for a statement describing the intended occupant, such as a renter or family member, with an estimated monthly rent if applicable, and a landscape plan for the area next to the unit where applicable.

The page does not list fees or review timelines, so confirm both with the Planning Division at (909) 399-5470. The page mentions that CalHFA grants can cover pre-development and impact fees up to $40,000; check current eligibility with CalHFA directly. Building permits for the construction itself follow the process in our Claremont building permits guide.

Zoning questions to ask before you build or sell

• Which zone is the property in, and what does it permit?
• Is the lot near a historic area or specific plan that adds design review?
• Do the existing structures meet setback and height rules?
• Was any converted garage or addition approved by both Planning and the Building Division?

ADUs, garage conversions and selling a Claremont house

A legal, permitted ADU can support value, but an unpermitted conversion can complicate a sale. Buyers’ lenders and appraisers generally count only permitted square footage, and California sellers disclose known unpermitted work. Our statewide guide explains the rules. Your options are to legalize the unit, disclose it and sell on the open market, or sell as-is to a cash buyer. Property maintenance rules are in our Claremont code enforcement guide.

How to sell a house in Claremont

1. Check whether any extra unit or conversion was permitted.
2. Collect plans, permits and final inspection records.
3. Request a no-obligation cash offer for the house as it stands.
4. Choose your closing date.
5. Close with no repairs, permit cleanup or showings required.

Frequently asked questions

How big can an ADU be in Claremont?

The city lists a 150 square foot minimum and a 1,000 square foot maximum for ADUs, and a 500 square foot maximum for junior ADUs.

What is the ADU setback in Claremont?

A minimum of 4 feet from the property line, with no exterior entrances or windows below six feet on sides less than 8 feet from the line.

How tall can a Claremont ADU be?

The city lists a maximum height of 16 feet.

Who do I call about an ADU in Claremont?

The Planning Division at (909) 399-5470.

Does Claremont have pre-approved ADU designs?

Yes, the city has a page of pre-approved ADU designs.

Can I sell my Claremont house with an unpermitted unit?

Yes. You can disclose it and sell as-is, including to a cash buyer.

More guides

• We Buy Houses in Claremont
• We Buy Houses in Los Angeles County
• Claremont Building Permits Guide
• Claremont Code Enforcement Guide
• All California Guides

Sources

• City of Claremont: Accessory Dwelling Units

This guide is general information from public sources, not legal advice. Confirm current rules with the city.