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Accessory Structure

An accessory structure is a structure which is on the same parcel of property as a principal structure and the use of which is incidental to the use of the principal structure. For example a residential structure may have a detached garage or storage shed for garden tools as accessory structures. Other examples of accessory structures include gazebos, picnic pavilions, boathouses, small pole barns, storage sheds, and similar buildings. National Flood Insurance Program (NFIP) regulations for new construction generally apply to new and substantially improved accessory structures.

Accessory structures are also referred to as appurtenant structures.

National Flood Insurance Program Requirements

  • 59.1 - Definition
  • 60.3 - Flood plain management criteria for flood-prone areas
    • (a) (3) - Reasonably Safe From Flooding
    • (c) (3) - A Zone Nonresidential Buildings
    • (c) (5) - Openings

FEMA POLICY
Floodplain Management Requirements for Agricultural Structures and Accessory Structures

Glossary Section
NFIP - National Flood Insurance Program