This depends on your deductible and the type of policy you have. If you have a full replacement policy, your total cost would be the amount of your deductible. If you have an actual cash value (ACV) policy, the insurance company subtracts your deductible from the total amount, and then they subtract a portion for depreciation. Some insurance companies will pay a lump sum at one time, while others will require the work to be completed before they release a final payment. If they pay a portion up front and are holding a portion back until completion, the final bill will be determined by the actual invoice not to exceed the adjusted amount.
EXAMPLE: The insurance company says it will allow $4,000.00 to replace your roof. Your deductible is $500.00. You will only receive $3,500.00 if the job costs $4,000.00. If the job costs $3,700.00, the insurance company will pay you $3,200.00 total, since your deductible is $500.00. They only owe the actual amount not to exceed the adjusted amount.