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Planning & Building Agency Building and Safety Division 20 Civic Center Plaza P.O. Box 1988 (M-19) Santa Ana, CA 92702 (714)-647-5800 www.santa-ana.org GRADING PERMIT REQUIREMENTS FOR DETACHED ADU PROJECTS PCC-15 REV: 09/03/2020 Page 1 of 1 A grading permit is required for all new detached buildings including new detached Accessory Dwelling Unit (ADU) projects. Grading plans prepared and stamped by a registered professional engineer shall be submitted for approval prior to issuance of the building permit, and shall be required to be submitted before or concurrently with the architectural plans submittal to the Building Safety Division. Grading Permit Exemption: Residential detached Accessory Dwelling Unit (ADU) projects that meet all of the following may be exempted from grading permit requirements: 1. The maximum amount of soil being moved is less than 50 cubic yards. The soil quantities shall be calculated by a California registered professional civil engineer 2. A site drainage plan prepared by a California registered professional civil engineer shall be provided with the following minimum information, but not limited to: a. Plan(s) shall be stamped, signed and dated by a California registered civil engineer b. Location of all existing and proposed structures, property lines, right-of-way lines, and easements, including dimensions and setbacks c. Drainage slopes and flow patterns d. Drainage system such as swales, french drains, water collection and disposal system, etc. e. Drainage plan shall indicate how the site grading or drainage system will manage all surface water flows to be diverted away from buildings and adjoining property lines, in accordance with all applicable codes f. The grade shall fall not fewer than 6 inches within the first 10 feet from the foundation wall. Where lot lines, walls, slopes or other physical barriers prohibit 6 inches of fall within 10 feet, drains, or swales shall be constructed to ensure drainage away from the structure. Impervious surfaces within 10 feet of the building foundation shall be sloped not less than 2 percent away from the building. 3. A final certification letter from the professional engineer of record stating that the grades were constructed per the approved site drainage plan, shall be submitted to the building inspector prior to final inspection 4. The “Detached ADU Grading Permit Exemption Checklist” shall be completed by the California registered professional civil engineer and shall be made a part of the building plans. 5. The site drainage plan and the completed checklist shall be required at the time of architectural plans submittal as part of the building plans package. The building official reserves the right to require a grading plan based on site conditions. This grading permit exemption does not apply to projects in the FEMA Flood Zone. 2429 W Hood Ave #2 - 10111640912/12/2023