On small activities that have a high uncertainty, the contractor might charge an hourly rate for labor, plus the cost of materials, plus a percentage of the total costs. This type of contract is called time and materials (T&M). Time is usually contracted on an hourly rate basis and the contractor usually submits time sheets and receipts for items purchased on the project. The project reimburses the contractor for the time spent based on an agreed-on rate and the actual cost of the materials. The fee is typically a percent of the total cost.
Time and materials contracts are used on projects for work that is smaller in scope and has uncertainty or risk, and the project rather than the contractor assumes the risk. Since the contractor will most likely include contingency in the price of other types of contracts to cover the high risk, T&M contracts provide lower total cost to the project.
To minimize the risk to the project, the contract typically includes a not-to-exceed amount, which means the contract can only charge up to the agree amount. The T&M contract allows the project to make adjustments as more information is available. The final cost of the work is not known until sufficient information is available to complete a more accurate estimate.
Archeological Site Evaluation
On a road construction project, the survey team discovers an archeological site. Contractors are required to preserve archeological sites and the project team explores ways to advance the schedule while a decision is made on how to handle the site. The project issues a T&M contract to an archeologist to determine the nature of the site and develop a plan to preserve the integrity of the site. A T&M contract is awarded because the size and character of the site is unknown and the amount of time and the type of equipment needed to explore the site is also unknown.
An archeologist from the local university was issued a T&M contract to cover the labor and expenses to explore the site and develop a plan. An hourly rate was established for each member of the five-person archeological team. Equipment rental fees plus 15 percent was paid on all equipment rented and supplies used. The archeological team’s profit was incorporated into the labor rates.
A not-to-exceed amount was also included in the contract to capture the team’s estimate of the amount of work. A contract change order would increase the not-to-exceed number when more information was available.
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