G112 Other Building Work — 2025 California Building Code

Garages and accessory structures shall be designed and constructed in accordance with ASCE 24, subject to the following limitations:

1. In flood hazard areas other than coastal high-hazard areas and coastal A Zones, the floors of detached garages and detached accessory storage structures are permitted below the elevations specified in ASCE 24, provided that such structures are used solely for parking or storage, are one story and not larger than 600 square feet (55.75 m [2] ).
2. In coastal high-hazard areas and coastal A Zones, the floors of detached garages and detached accessory storage structures are permitted below the elevations specified in ASCE 24, provided that such structures are used solely for parking or storage, are one story and are not larger than 100 square feet (9.29 m [2] ). Such structures shall not be required to have breakaway walls or flood openings.

Fences in floodways that have the potential to block the passage of floodwaters, such as stockade fences and wire mesh fences, shall meet the requirement of Section G104.5.

Oil derricks located in flood hazard areas shall be designed in conformance with the flood loads in Sections 1603.1.7 and 1612.

Retaining walls, sidewalks and driveways shall meet the requirements of Section 1804.5.

Swimming pools shall be designed and constructed in accordance with ASCE 24. Above-ground swimming pools, on-ground swimming pools and in-ground swimming pools that involve placement of fill in floodways shall also meet the requirements of Section G104.5.

Decks, porches and patios shall be designed and constructed in accordance with ASCE 24.

In coastal high-hazard areas and coastal A zones, nonstructural concrete slabs used as parking pads, enclosure floors, landings, decks, walkways, patios and similar nonstructural uses are permitted beneath or adjacent to buildings and structures provided that the concrete slabs shall be constructed in accordance with ASCE 24.

Roads and watercourse crossings that encroach into regulated floodways, including roads, bridges, culverts, low-water crossings and similar means for vehicles or pedestrians to travel from one side of a watercourse to the other, shall meet the requirement of Section G104.5.