The definition of defensible space is: the required space between a structure (home, detached garage, outbuildings, etc.) and the wildland area that, under normal conditions, creates a sufficient buffer to slow or halt the spread of a wildland fire to a structure. Defensible space protects the structure from igniting due to direct flame or radiant heat. It is essential for structure survivability during wildland fire conditions and equally important for the protection of firefighters defending your home/property.