Whilst the Contractor is responsible for the payment of insurance premia and ensuring that the insurances are in place, the Contract contains powers that allow for sharing of increases/decreases in the premium beyond a certain level between the parties by reviewing the cost of the project's insurances every 2 years. There is now a standard mechanism for carrying out this review and agreeing any sharing of increases/decreases which is set out in Part 21 of the Schedule. This sharing mechanism should mean that the Contractor does not build on excessive risk sum into its price to allow for insurance costs increasing.