Which factor is essential in determining the cost of a construction project?

The complexity of the design is a crucial factor in determining the cost of a construction project because it directly influences the materials, labor, and time required to complete the project. When a design is more complex, it may necessitate specialized skills or techniques, which can increase labor costs. Additionally, intricate designs often require more valuable or sophisticated materials, adding to overall expenses. The challenges presented by a complex design can also lead to longer construction timelines, further contributing to costs. Therefore, understanding the design's complexity is vital for accurate budgeting and resource allocation in construction projects.