Choosing the right construction delivery methods can make or break a project. The model you select influences cost, schedule certainty, risk allocation, and how collaborative or adversarial the project feels.

This guide compares traditional construction delivery with key alternative project delivery methods, so owners, developers, and stakeholders can choose the approach that best fits their goals.

What Is Traditional Construction Delivery?

Before exploring specific project delivery methods, it helps to understand the approach that has shaped the construction industry for decades. Traditional construction delivery follows a structured, sequential process in which design is completed before contractors submit bids and construction begins. This method remains widely used because it provides clear roles, defined project phases, and a straightforward path from planning to completion.

Design-Bid-Build (DBB)

When people say “traditional construction delivery,” they usually mean Design-Bid-Build (DBB).

How it works

1. Design:  You hire an architect/engineer to develop the design under a direct contract with you.
2. Bid: Once documents are complete, contractors competitively bid the work.
3. Build: You award to the lowest responsive and responsible bidder; the contractor builds what is shown in the documents.

You hold two main contracts: one with the design team and one with the contractor. The two parties are contractually separate, and you sit in the middle.

DBB remains the most familiar and widely used model, particularly in the public sector.

Advantages of Design-Bid-Build

• Familiar, well-understood: Processes, contracts, and expectations are clear to most public and private owners.
• Transparent price competition: Completed documents allow “apples-to-apples” bidding, which can drive down the initial contract price.
• Clear role separation: Designers focus on design quality; contractors focus on execution.

Challenges of Design-Bid-Build

• Longer schedules: Design, bid, and build happen in sequence, which can extend the overall duration compared to overlapping methods.
• Limited early contractor input: Without a builder at the table during design, you may face constructability issues, higher change orders, or missed value opportunities.
• Higher dispute potential: Gaps or ambiguities in drawings can lead to RFIs, change orders, and disputes between designer and contractor, often with the owner caught in the middle. Comparative research on traditional vs. modern construction processes underlines this risk dynamic.

For straightforward projects, with a well-defined scope and flexible schedule, DBB can still be a solid choice.

Alternative Project Delivery Methods

To address DBB’s limitations, many owners are turning to Design-Build, Construction Manager at Risk (CMAR), and Integrated Project Delivery (IPD). These methods aim to improve collaboration, compress schedules, and better align incentives.

Design-Build vs. Design-Bid-Build

Design-Build and Design-Bid-Build take different approaches to project delivery, with each offering distinct advantages in terms of collaboration, scheduling, cost management, and overall project execution.

How Design-Build works

In Design-Build (DB), you contract with one entity responsible for both design and construction.

• Single contract: Owner → Design-Builder.
• The design-builder assembles and manages the full team.
• Design and construction can overlap, allowing early site work while later design packages are still being finalized.

This integration is a key differentiator from DBB.

Advantages of Design-Build

• Single point of responsibility: You no longer mediate between designer and contractor; the design-builder is accountable for the outcome.
• Faster delivery: Overlapping phases can significantly reduce the time from concept to completion.
• Better early cost control: Integrated teams are able to coordinate design decisions with real-time cost and constructability feedback.

Challenges of Design-Build

• Less direct control over detailed design: Owners typically set performance criteria, while the design-builder controls many design specifics.
• Different competitive model: Selection often blends qualifications, design concepts, and pricing, rather than a pure low bid.
• Requires a clear brief: Vague requirements can lead to misaligned expectations.

Design-Build vs Design-Bid-Build: the trade-off

• DBB: More traditional oversight and competitive bidding on a finished design.
• DB: More speed, integration, and single-point accountability, with less granular control over every design choice.

Construction Manager at Risk (CMAR)

For owners who want to retain a separate design team while benefiting from early construction expertise, Construction Manager at Risk (CMAR) offers a collaborative approach that can improve budgeting, scheduling, and project planning before construction begins.

How CMAR works

With Construction Manager at Risk, you bring a construction manager (CM) on board early, while design is still in progress:

• The CM advises on cost, schedule, and constructability during design.
• At an agreed point, the CM provides a Guaranteed Maximum Price (GMP) and becomes the general contractor.
• The CM holds the trade contracts and assumes risk for delivering within the GMP and schedule.

You maintain a separate contract with the designer, but now have a collaborative partner for both preconstruction and construction.

Advantages of CMAR

• Early cost and schedule insight: Continuous estimating and phasing input keep design decisions grounded in budget and time.
• Constructability and value engineering: Design decisions benefit from on-the-ground experience from day one.
• Potential schedule gains: Like Design-Build, CMAR often uses phased packages and early starts.

Challenges of CMAR

• More complex procurement: Owner selection focuses on qualifications, fees, and approach, not just low bid.
• Perception of reduced competition: Although trade packages are typically bid, the CM itself is not usually chosen on the lowest price alone.
• High trust requirement: To capture the benefits, owners, designers, and CMs must share data transparently.

CMAR is well-suited to complex, schedule-sensitive projects where collaboration and risk management matter as much as initial low bid pricing.

Integrated Project Delivery (IPD)

Integrated Project Delivery (IPD) represents a highly collaborative construction approach where all major stakeholders work under a unified agreement to share responsibility, risk, and project outcomes from the earliest stages.

How IPD works

Integrated Project Delivery aligns contracts and incentives across the owner, designer, builder, and key trades:

• Parties enter a multi-party agreement that shares risk and reward.
• Incentives are tied to collective performance on cost, schedule, and quality.
• Teams typically rely on Building Information Modeling (BIM) and lean construction practices.

Research into collaborative procurement in construction points to IPD-like structures as effective for highly complex projects.

Advantages of IPD

• High collaboration and innovation: All key players are at the table early, improving design quality and constructability.
• Aligned incentives: Shared risk and reward reduce adversarial behavior and encourage problem-solving.
• Strong fit for mission-critical projects: Particularly where performance, phasing, or stakeholder coordination is demanding.

Challenges of IPD

• Non-traditional contracts: Requires comfort with new contract models and governance structures.
• More front-end effort: Target value design, intensive planning, and workshops are required up front.
• Steep learning curve: Best suited to teams with prior experience in collaborative delivery.

How to Choose the Right Delivery Method

Use these lenses to evaluate which model suits your project:

1. Complexity
   • Simple, well-defined projects: DBB or Design-Build.
   • Complex, multi-phase, or high-risk projects: CMAR or IPD.
2. Schedule priority
   • If speed-to-market is essential, overlapping methods like Design-Build or CMAR can be advantageous.
   • If the schedule is less important and you want a fully designed, bid project, DBB may suffice.
3. Budget and risk tolerance
   • Need early cost certainty? CMAR with a GMP, or Design-Build, may be better.
   • Comfortable with traditional change-order dynamics? DBB is familiar.
   • Willing to share risk for potentially greater overall value? Consider IPD, supported by collaborative procurement research.
4. Desired level of collaboration
   • High collaboration and transparency: CMAR or IPD.
   • Clear separation of roles: DBB.
   • Integrated but streamlined relationship: Design-Build.
5. Regulatory and procurement constraints
   • Public owners may be required to use DBB or follow specific competitive processes.
   • Private owners and developers have more flexibility to adopt alternative methods or hybrids.

Getting More Value from Any Delivery Method

Regardless of delivery model, strong planning, engineering, and project management are the real drivers of cost and schedule performance.

Effective partners combine local market knowledge with rigorous processes, like Brownstone’s focus on engineering and project management to help owners make better decisions early and avoid costly surprises later.

Three practices consistently improve outcomes:

1. Robust preconstruction planning
   Clear goals, risk registers, and early alignment on scope, budget, and schedule reduce rework and downstream disputes.
2. Data-driven scheduling
   Detailed, regularly updated schedules help anticipate bottlenecks, test scenarios, and avoid common pitfalls such as unrealistic durations or out-of-sequence work.
3. Transparent cost and performance tracking
   Documented savings, open-book practices (where appropriate), and clear reporting support better decision-making throughout the project lifecycle, reflecting the emphasis on efficiency and transparency.

Next Steps

If you’re planning a new project and are unsure which delivery method is right for you:

• Clarify your priorities: speed, cost certainty, flexibility, innovation, or all of the above.
• Map those priorities against DBB, Design-Build, CMAR, and IPD.
• Engage a trusted, locally informed consultant early to help you model options and structure contracts around your objectives.

To discuss which construction delivery methods best align with your upcoming project, you can connect with a specialist construction consultancy. Contact Brownstone Consultants today.