This Guide describes how trees may damage foundations and cause cracks in walls, and how to determine the right course of action to prevent further damage. Gives recommendations on the safe distance from a building, depending on tree species. Species covered are: hawthorn, cherry, plum, beech, birch, lime, ash, elm, maple, sycamore, whitebeam, rowan, cypress, willow, elm, plane, chestnut, oak, poplar. Oak, poplar and willow pose the greatest risk to foundations. 4 pages.