Project budget 
The project budget is a prediction of the costs associated with a particular company project. These costs include labor, materials, and other related expenses. The project budget is often broken down into specific tasks, with task budgets assigned to each

From Wikipedia

CONSTRUCTION  PROJECT - COST FINANCIAL SERVICE -  INSURANCE

If we know the amount of time consumed and the sequence of each task is relatively simple for someone with experience, make a plan work in a fast, this plan will be very useful for a good evaluation of offers and an optimal Construction Project Management  . This plan will allow us to:

1 The assess of what would be a Budget of Expenditures and compare it against a Budget of Revenues, that we will obtain from contractual payment terms of the construction and of estimate production velocity
In this way we will know something about the initial capital and the capital that we will need at regulars intervals of time during construction, this will allow us to make an estimate of financial interests. Also included in this analysis, the Guarantee Fund, and the cost of the interest generated by not having these funds on a monthly, if they we allowed to replace those funds by a Caution Insurance, must be added the cost of this bond . This work can be made by the Accountant Department of the Company, but for make these estimation ,the Accountant need our preliminary plan of works.
Remember all the time,  that we need an optimal Construction Project Management. After completing this analysis, we will can assess the financial cost of the Work

2-Another issue to consider is the requests for Insurance service indicated by the Client, in every specification the Client establishes the type of Insurance that it will request for the construction, we can request a quote to a third, and then ,add these cost to the Offer.
In addition to the occupational accident Insurance and life (that which we usually charge to the cost of man-hours for make constrution works) there are another Insurances to cover risks during construction
For example, if a company is working on an oil refinery and has to move a Equipment with a crane ,there is a risk  to make damage to existing facilities, there is the risk of fire , there is a risk of harm to other operators, the risk of profit earnings, the risk of beating the Equipment that is being mounted, the risk when transported the Equipment to work.. All these risks must be covered and someone must pay for this. Sometimes the client  contract includ this Insurance , and sometimes not, we must see what are the Insurances request of the Client. Our Promoter of Insurances , can make a complet assessment to us. All this work is part of Construction Project Management