Trees occupy an odd position in commercial risk management. A formal inspection by a qualified arboriculturalist at intervals determined by the risk zoning, typically somewhere between one and five years. Tree Preservation Orders and conservation area designations restrict what can be done to trees regardless of who owns the land. A protected tree standing where the access road needs to go is a planning problem, a programme problem, and occasionally a deal breaker. The first is treating tree work as a grounds maintenance line item to be awarded on price.