What would be the best source to use when estimating job site overhead?

Using historical job site overhead costs records is the most effective method for estimating job site overhead because it provides real data from past projects that reflects actual expenses incurred under similar conditions. This source allows for a more accurate prediction of future overhead costs based on previously experienced variances and expenses that occurred on comparable job sites.

When relying on historical data, factors such as project size, scope, location, and specific site circumstances are considered, which can lead to a more reliable and tailored estimate. Historical records also help identify trends and potential unforeseen costs by utilizing information from completed projects.

While an overhead site survey might offer relevant data, it typically lacks the comprehensive detail and context provided by historical records. A local lumber company may provide cost estimates for materials but does not address the overall job site overhead comprehensively, which includes a variety of indirect costs. Therefore, historical job site overhead costs records are the most robust and insightful source for this estimation.