Maybe not much. In recent years the builder's risk insurance policy coverage has continued to shrink. Only a few years ago, subcontractors were insured under such a policy - now it takes an entirely separate endorsement. Policies do not cover defects in workmanship. It may, however, in some circumstances, pay for damage caused by a defect. For example, if a roof leaks, it will not pay to fix the roof - it may pay for the damage to the house that the leak caused. Also, once a project is completed, many policies try to exclude coverage for "completed operations". My opinion is that both the general contractor and the owners are being short changed when it comes to the purchase and protection of builder's risk policies.