Contingency costs can be incurred during any of the construction project phases. For example, a design error may lead to an unexpected increase in material expenses before ground-breaking. At the same time, a stretch of inclement weather might delay or complicate final detailing and sign-off steps.
Retention is security held by a procuring contractor to guarantee the performance of a suppling contractor and in particular to safeguard against defects in the event that the supplying contractor fails to satisfactorily rectify them.
Retention in construction is a financial security usually held by the principal against the head contractor and by the head contractor against subcontractors.
The purpose of retention — also known as retainage — is to incentivize contractors to complete a job ing to the contract terms by withholding a portion of their payment until all agreed-upon project milestones have been met. It's like a risk management strategy to ensure job completion.
Contingency costs can be incurred during any of the construction project phases. For example, a design error may lead to an unexpected increase in material expenses before ground-breaking. At the same time, a stretch of inclement weather might delay or complicate final detailing and sign-off steps.
This contingency is normally calculated as a percentage. If the phase is 100 days of effort, contingency at 20% would be another 20 days. As the project progresses, the level of risk reduces as the requirements and issues become known, so the percentage will be reduced.
Design contingencies help estimate costs while you plan the project, and bidding contingencies cover any bid day anomalies. Perhaps most importantly, construction contingencies cover any unexpected circumstances that arise while the project is underway, maintaining your budget.
How Is Construction Contingency Calculated? Typically, most construction projects use a contingency rate of 5% to 10% from the total project budget. This is typically enough to cover any unexpected costs that may arise throughout the project.