Your insurance agent should be able to be of some help. They should be familiar with building costs in your area, and such, and can help you determine the correct coverage. You can review your existing coverage with any competent agent anytime, to be sure your coverage level is adequate. In my area, for new construction, there is about a 4 to 1 ratio on land value to house. In other words, if a lot is selling for $100K, the target price is to build a house in there for a total cost of about $400K. Those are very approximate. If you are really worried, have an appraisal done to see what the current cost of completely rebuilding a similar structure on the same lot would run, and see if your policy would cover that. Dave