Pros/Cons of Design-Bid-Build vs. Construction Manager at Risk vs. Design/Build

What's the Difference? A Brief Comparison of Three Popular Construction Project Delivery Methods.

photo credit: Anssi Koskinen

What's the best project delivery model when you're trying to construct a building? Well, the answer depends on your priorities for the project, as well as your own desire for involvement in the process. Governing priorities that might tip the decision towards one option or the other include whether you want to have a minimum of time commitment or rather a great deal of personal control over the process, whether a collaborative team structure is highly important to you, or whether ensuring you get the very most competitive construction bid is the bottom line.

Let's look briefly at three different ways to organize the contracting on a construction project. This study is by no means exhaustive, but is rather intended to give owners a brief orientation on the topic.

1. Design-Bid-Build


In this approach, the design team works directly for the owner, and produces a set of construction documents that are used as the basis of a competitive bidding process. One version of this process is known as "Competitive Bids," wherein a group of contractors (pre-qualified or not) submit bids for the scope of work as defined in the contract documents, and the lowest bidder usually gets the project. Another version of this process is known as "Competitive Sealed Proposals," wherein a group of contractors submit a proposal to do the work that includes both fees and a presentation of their qualifications, which usually results in one of the three lowest bidders getting selected, provided their references and qualifications indicate they will do a good job.


  • Can result in the lowest total construction cost due to the widest-open field of bidding competition.


  • General contractor chosen primarily on price, secondarily on qualifications.

  • General Contractor is not on board early in the process to give feedback during the design process, to get acquainted with the design team and their intentions, and begin establishing trust as a team member.

  • This model is particularly susceptible to Change Orders (i.e. cost increases) during the construction process due to the bidders not being available to collaborate with the design team earlier in the process. If change orders become contentious during construction, finger-pointing often results, and the design team's documents will be heavily scrutinized for errors & omissions.

  • The lowest price general contractor is not always the most qualified. Consider GC selection based on qualifications and price.

  • Not having a contractor on board early in the process may be partially compensated for by hiring a professional cost estimator to conduct milestone price checks to confirm whether the project is on target.

  • The delay in selecting a general contractor until construction documents are 100% complete almost always poses an elongated transition of the project from design to start of construction.

2. Construction Manager At Risk (CMAR)


But what if you teamed up with your general contractor at the beginning of the design process? This model is called Construction Manager at Risk (a.k.a. "CMAR", or "CM@Risk"), and the idea is that a number of benefits can be seen by forming your team early, such as better cost feedback during the design process, more time for the contractor to thoroughly grasp the scope and details of the project, and more time for the owner, design team, and contractor to develop a mutual sense of understanding and trust prior to the start of construction. Some CMAR arrangements include compensation for the contractor's pre-construction services, while other arrangements do not.