This is an area of protection within an insurance programme that is often an afterthought. Inadequate insurance is a real risk here as the difficulties of reinstating a building following a major loss can be substantial.  The period you insure the lost rent (12 mths, 18 mths, 24 mths etc) becoming more critical depending on the nature of the damage (does the building have to be knocked down, site cleared etc?), the nature of your property, the local council attitudes and processes, compliance obligations, neighbours, economic factors, trade and or materials supply issues etc etc.  A major event could mean a rebuild period of years.  DON’T SKIMP on the Loss of Rent allowance under your insurance programme as this is by comparison one of the lower cost options yet possibly the difference between getting your building back or not!