Understanding Construction Cost Contingencies

In construction projects, it is standard practice to include an amount in the total estimated cost to cover unexpected expenses, changes, or unforeseen conditions that may arise during the construction phase. This amount is known as a contingency.

Contingencies act as a buffer or reserve fund to handle potential risks and uncertainties inherent in any construction work. These risks can include:

• Design changes or modifications.
• Unforeseen ground conditions (like discovering rock or unstable soil).
• Delays caused by weather or other factors.
• Material price fluctuations.
• Errors or omissions in the design or planning documents.

The percentage added for contingencies can vary depending on several factors, such as:

• The complexity of the project.
• The level of detail in the design and planning stages (a more detailed plan might require a lower contingency).
• The experience of the project team.
• The risk assessment for the specific site and type of construction.

While the percentage for contingencies can range, a common and often used figure for typical building projects is around 5% to 10% of the total estimated construction cost. For projects with higher uncertainty or less detailed planning, this percentage might be higher. For very well-defined and low-risk projects, it might be slightly lower.

Based on common practice in construction cost estimation, adding 5% to the total cost for contingencies is a widely accepted figure for many standard projects.

Therefore, the percentage of the total cost typically added for contingencies in the cost of construction is 5%.

Revision Table: Construction Cost & Contingencies

Additional Information on Construction Contingencies

Contingencies are a crucial part of effective construction project management and budgeting. Failing to include an adequate contingency can lead to budget overruns and project delays if unexpected issues arise. It's important to note that the contingency fund should be managed carefully and only used for legitimate unforeseen costs, not for scope creep or poor planning.

Project owners and contractors negotiate the contingency percentage based on a detailed assessment of project risks. A realistic contingency helps ensure that the project can be completed within budget even when faced with challenges that could not be perfectly predicted during the planning phase.

While 5% is a common benchmark, complex or unique projects might warrant a higher contingency percentage. Similarly, renovation projects often carry higher risks than new construction, potentially requiring a larger contingency.