To allow automatic regular increase in the sum insured throughout the period of the policy in return for an additional premium to be paid in advance. Selected percentage increase shall not exceed 25% of the sum insured. The additional premium at 50% of the final rate to be charged on the selected percentage increase in advance. Sum insured at any point of time would be assessed after application of the Escalation Clause which is applicable all policies (and not only reinstatement value policies) covering Building, Machinery and Accessories only and shall not apply to stock.