Costs or cost-plus: In a Cost Plus contract, the owner reimburses the contractor for all costs incurred during construction, such as equipment and work. The owner also pays an agreed profit margin, usually a flat fee or a percentage of the total cost. There should be no conflict in the payment method. The method of payment can be made by cash, check or electronic transfer of money, in accordance with the mutual agreement. The law of the land should be respected so that there are no problems. You can settle the payment at the end of the month. If you are not able to pay large bills immediately, you can negotiate with the contractor so that the payment of the invoice is made in instalments. It is therefore necessary to clarify the frequency of payments and the volume of payments. If you don`t pay according to the date stated in the contract, you might want to pay the fine…