How Design Variables Influence Estimates in Construction

How Design Variables Ripple Out

• Design variables produce ripple-effects on construction projects. If a mechanical designer opts for a particular fire-protection system, that decision might affect such related components as structural attachment devices, hangers, accessibility, utility space and more. Construction projects take on an energy that needs to be fed constantly with updates and real-time information, if efficiency and effectiveness are to be optimal.

Crucial Communications

• Many construction projects have several independent arms working simultaneously and it is a constant battle to keep communications flowing to keep all involved updated. Design variables chosen in one arm must be communicated throughout the entire project team as soon as possible to avoid costly tear-outs and reconstruction.

Considerations

• Ideally, real-time communications are taking place and today's construction workers are often in direct contact with others on the project team via cell phones or hand-held computers, which help minimize negative impact of design variables. Software systems help to collect real-time data on a variety of construction issues, from the actual time taken to complete a task versus the estimated time, to information about a last-minute substitution in mechanical equipment components.