Alternative delivery methods are classified into two methods of construction, they are, (a) Design/build method and (b) Design bid- build method.
The traditional bid-build method consists of the overall owner of the project, then it is further connected to a resident engineer who does the day to day oversight of the construction. This further leads to the designer, the construction manager (this is the adviser during construction) and the general contractor these people can also be called the sub contractors.
In this kind of method, advertisement is done to promote their products, there are open bids for who should or can take ownership of the project. The lowest bidder gets the job.
Advantages of bid- build method include;
- It is a familiar delivery method.
- It has a simpler process to manage
- It is a fully designed scope for both design and construction
- Both the design team and the contractor are accountable to the owner
Disadvantages of bid-build method
- Linear process equals longer schedule.
- There is no control over contractor selection.
- No design or cost input from contractor
- It can create adversarial relationships
For the design/ build method, a single entity provides for both the design and construction of the project. The owner contracts the architect/engineering firm at the same time as the contractor, as a team. The design is not complete without procurement of design. This usually requires plans to be at 25-30% completion, and is a non-linear process in which design and construction overlap
Advantages of design/build method
- Single point of accountability for design and construction.
- Enables fast-track delivery because construction begins before design is complete.
- Project cost defined early in the process.
Disadvantages of design/build method
- Design-Build firm controls contingency
- Not suited for small projects
- Requires additional design effort
- Change management may be expensive.
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