Construction project delivery methods define how owners, designers, and contractors work together throughout the life of a project. The delivery method determines how responsibilities are assigned, how contracts are structured, and how communication flows between stakeholders.
Understanding these delivery models helps project teams select the approach that best fits their budget, timeline, and risk tolerance.
Some of the most common construction project delivery methods include:
• Design-Bid-Build (DBB)
• Design-Negotiate-Build (DNB)
• Design-Build (DB)
• Construction Manager at Risk (CMAR)
Each approach influences collaboration, risk distribution, and project outcomes in different ways.
Design-Bid-Build (DBB)
Design-Bid-Build is one of the most traditional construction delivery methods. In this model, the project owner signs separate contracts with the design team and the construction contractor.
The process typically follows three stages.
First, the architect or design team works with the owner to create the project plans and specifications. Once the design is complete, contractors submit bids based on those finalized plans. The owner then selects a contractor, and construction begins.
Because the contractor enters the project after the design phase is completed, there is typically limited collaboration between the design and construction teams during planning.
Benefits of Design-Bid-Build
• Competitive bidding can help reduce initial project costs
• Clear separation between design and construction responsibilities
• Owners maintain control over contractor selection
Challenges of Design-Bid-Build
• Limited collaboration between designers and contractors
• Potential for change orders if construction challenges arise
• Longer project timelines because construction cannot begin until design and bidding are completed
Design-Negotiate-Build (DNB)
Design-Negotiate-Build follows a similar structure to Design-Bid-Build but introduces the contractor earlier in the process.
Instead of opening the project to competitive bidding, the owner selects a contractor based on qualifications or proposals. The owner and contractor then negotiate contract terms before construction begins.
Because the contractor participates during the design phase, they can provide valuable input regarding construction methods, materials, and costs.
This early collaboration helps identify potential issues before construction begins.
Benefits of Design-Negotiate-Build
• Early collaboration improves efficiency during design and construction
• Contractors can provide cost insight before designs are finalized
• Owners can tailor contracts to the specific needs of the project
Challenges of Design-Negotiate-Build
• Lack of competitive bidding may increase initial costs
• Owners may have less negotiating leverage on final pricing
• This method may not be allowed for certain public projects
Design-Build (DB)
In the Design-Build delivery method, a single organization is responsible for both the design and construction of the project. Instead of separate contracts, the owner signs one contract with a design-build team.
Because designers and contractors work together from the beginning, communication is streamlined and decisions can be made more quickly.
This collaborative approach often allows construction to begin sooner and helps reduce potential misunderstandings between design and construction teams.
Benefits of Design-Build
• Simplified contract structure for the owner
• Early collaboration between design and construction teams
• Faster project timelines due to overlapping design and construction phases
• Greater cost visibility during the early stages of the project
Challenges of Design-Build
• Lack of competitive bidding may increase initial pricing
• Greater responsibility placed on the design-build team
• Project scope must be clearly defined to avoid misunderstandings
Construction Manager at Risk (CMAR)
In the Construction Manager at Risk delivery model, the owner hires a Construction Manager (CM) early in the project to oversee planning and construction.
The CM works closely with the design team during the preconstruction phase and later acts as the general contractor during construction.
One key feature of CMAR is the Guaranteed Maximum Price (GMP). This establishes a cost ceiling for the project. If construction costs exceed the agreed amount, the construction manager is responsible for the difference.
Because the CM participates in design discussions early, they can provide insight that helps control costs and reduce potential construction challenges.
Benefits of CMAR
• Early contractor involvement improves planning and coordination
• Guaranteed maximum price provides cost certainty for owners
• Reduced risk for project owners
• Strong collaboration during preconstruction and design
Challenges of CMAR
• Project timelines may be longer compared to some delivery methods
• The construction manager assumes greater financial risk
• Owners must select an experienced and trustworthy CM
Choosing the Right Delivery Method
No single project delivery method is ideal for every situation. Each approach offers unique advantages and potential challenges.
Project owners must consider several factors when choosing a delivery model, including:
• Project complexity
• Budget requirements
• Timeline expectations
• Risk allocation between stakeholders
Contractors and construction managers also evaluate project risks, potential changes, and expected profitability before participating in a particular delivery method.
By carefully selecting the appropriate delivery approach, project teams can improve collaboration, reduce uncertainty, and increase the likelihood of project success.
Frequently Asked Questions
What are the main construction project delivery methods?
The most common delivery methods include Design-Bid-Build (DBB), Design-Negotiate-Build (DNB), Design-Build (DB), and Construction Manager at Risk (CMAR). Each method defines how project responsibilities and risks are shared between stakeholders.
What is Design-Bid-Build?
Design-Bid-Build is a traditional delivery model where the project owner hires a designer first and then selects a contractor through a competitive bidding process after the design is completed.
What is Construction Manager at Risk?
Construction Manager at Risk involves hiring a construction manager early in the project to oversee planning and construction. The manager typically provides a guaranteed maximum price and assumes responsibility for cost overruns.
What is Construction Manager at Risk?
Construction Manager at Risk involves hiring a construction manager early in the project to oversee planning and construction. The manager typically provides a guaranteed maximum price and assumes responsibility for cost overruns.
How do you choose the best delivery method?
Selecting the right delivery method depends on project priorities such as budget control, speed of delivery, level of collaboration, and risk management.
