All residentially-zoned properties are eligible to construct one ADU and one Junior ADU (JADU), regardless of lot size. For studios and one-bedroom ADUs, 850 square feet is allowed and up to 1,000 square feet for 2 or more bedrooms. A JADU is created within the walls of a single-family residence and may share central systems and restrooms with the primary residence, and must contain a basic kitchen. JADUs are allowed up to 500 square feet. Please visit Development Code Section 22.42.120 for additional ADU requirements.
Once you have plans ready, you may submit through the Planning inquiry form. No additional forms are required at this stage. Please allow a few days for the Planning and Building and Safety Divisions to review for completeness. Once authorization is received, a City planner will instruct you on the next steps for formal building plan check submittal to the Building and Safety Division. There is a 15-working day turnaround once accepted by the Building and Safety Division. Every subsequent submittal is 10 working days. When all comments/corrections have been addressed, your permit will be issued for the ADU.
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You can obtain or verify your property's zoning designation by using the City's interactive GIS map and searching by street address or by Assessor’s Parcel Number (APN). You can also obtain zoning information by contacting the Planning Division at (909) 839-7030 or email@example.com. If you do not have your AIN, you can find it on your latest property tax bill or you can locate it using the Los Angeles County Assessor's online portal.
To determine allowable uses on a property, refer to the Land Use Table in Development Code Section 22.08.030 for residential properties and Development Code Section 22.10.030 for commercial, office and industrial properties. Uses listed with a “P” are permitted outright; uses listed with a “CUP” require approval of a conditional use permit; and a dash ( - ) means that the use is not permitted in that zoning designation. Contact the Planning Division at (909) 839-7030 or Planning@DiamondBarCA.gov for CUP application requirements.
Exact location of property lines are determined by a licensed surveyor. The City does not recommend any specific surveyor or survey company. However, you can search for California-licensed professional engineers and land surveyors by visiting the California Department of Consumer Affairs website. For approximate property lines, visit the L.A. County Office of the Assessor’s website for your property line dimensions.