Buildings does not just mean the structure of your property, it can also include outbuildings, greenhouses, extensions, porches and conservatories, paths, driveways and patios, walls, gates and fences.
However, damage to walls, gates and fences by storm or flood is excluded. For an accurate description of what is deemed to be part of your buildings cover you should refer to the definitions page in your own policy wording as it can vary per insurer.
Damage to Landscaped gardens, trees and shrubs is normally excluded under buildings insurance and can usually be covered through extension for damage caused by emergency vehicles attending a fire.