What is a "redline" drawing?

A "redline" drawing refers specifically to a marked-up version of construction drawings that indicates modifications, corrections, or updates made during the construction phase. These changes are typically highlighted in red ink, hence the term "redline." This process is crucial in construction management and commissioning because it captures the evolution of the project as it moves from the design to the completed phase, ensuring that all parties are aware of on-site adjustments that differ from the original plans.

This form of documentation serves various purposes: it enables accurate project tracking, assists in maintaining compliance with specifications, and supports overall project communication among architects, engineers, contractors, and clients. Having a clear record of changes is vital for future maintenance, potential renovations, and understanding the reasons behind certain design choices.

The other options do not accurately describe what a "redline" drawing is. For instance, documents showing occupancy calculations focus on different aspects of building use and safety rather than changes in design. A finalized official blueprint represents the approved design without indicating any adjustments made during construction, while a summary of project costs pertains to budgeting rather than the visual documentation of changes in construction drawings.