How do design changes affect construction estimates?

Design changes can significantly impact construction estimates, primarily by leading to cost increases and project delays. When a design change occurs, it often necessitates a reevaluation of the original budget and timeline. This can involve additional costs for different materials that may not have been budgeted for, increased labor expenses due to rework or new installations, and possibly the need for new permits or approvals.

Moreover, modifications to the design might lead to a rearrangement of the project schedule. If many aspects of the project are altered, tasks may need to be rescheduled or re-sequenced, leading to additional delays. All of these factors together inherently contribute to increased costs and delays, which is why option B accurately reflects the consequences of design changes in construction estimating. Understanding this relationship is crucial for effective project management and financial planning in construction projects.