The project cost business proposal is a proposal that defines the total cost to be incurred on the completion of the project. It does so by individually writing down the cost of all categories and then summing them up. In this way, the total cost of the project is known before starting the project in order to get a rough idea of all the expenses which will be incurred. This helps in decision making as by looking at the paper containing all the relevant points, one is able to negotiate over terms which he may not require for the completion of a project and may also add up certain items which he may regard as important and then devise the total cost. It is also possible that you tell your project requirements to someone and keeping in mind all the requirements, he may devise the pricing of the overall project.