DBIA Sustainability and Green Building in Design-Build — Questions and Answers
Question 1: Design-build is considered particularly well-suited for sustainable (green) building projects primarily because:
- Design-build contracts require all projects to pursue LEED certification
- The integrated team structure allows sustainability strategies to be optimized across design and construction simultaneously (Correct answer)
- Design-build eliminates the need for third-party commissioning agents
- Public agencies are legally required to use design-build for green projects
Correct answer: The integrated team structure allows sustainability strategies to be optimized across design and construction simultaneously
Design-build's integrated team—where designers and builders collaborate from project inception—enables early identification and optimization of sustainability strategies that would otherwise be difficult to coordinate across separate design and construction contracts. Systems can be designed holistically for energy performance, with construction methods aligned to sustainability goals from the start.
Question 2: When an owner sets a LEED Gold certification requirement in a design-build RFP, this is best classified as:
- A prescriptive specification dictating exactly how sustainability must be achieved
- A performance-based requirement defining an outcome the design-builder must achieve through its own means (Correct answer)
- An optional enhancement that the design-builder may price as an alternate
- A design standard that eliminates the design-builder's professional liability
Correct answer: A performance-based requirement defining an outcome the design-builder must achieve through its own means
Specifying a LEED certification level is a performance-based requirement—it defines the outcome (certification level) without dictating exactly how the design-builder must achieve it. This is consistent with design-build's philosophy of giving the integrated team flexibility to determine the best means and methods for meeting defined performance goals.
Question 3: Building Information Modeling (BIM) enhances design-build project delivery primarily by:
- Replacing the need for a design subconsultant on the design-build team
- Enabling earlier clash detection and integrated coordination among design, structural, and MEP systems (Correct answer)
- Guaranteeing LEED certification for projects that use it
- Satisfying the owner's programming requirements without additional design effort
Correct answer: Enabling earlier clash detection and integrated coordination among design, structural, and MEP systems
BIM creates a shared digital model of the project that allows design, structural, and MEP/FP disciplines to coordinate in three dimensions, identifying conflicts (clashes) before construction begins. In design-build, where the integrated team controls both design and construction, BIM amplifies the collaboration advantage by enabling more informed decisions earlier in the process.
Question 4: An owner seeking to minimize a building's operational energy costs over a 20-year period should prioritize which approach when selecting a project delivery method?
- Design-bid-build, because competitive bidding minimizes first cost
- Construction management at-risk, because the CM controls subcontractor selection
- Design-build with a total cost of ownership requirement, because the integrated team can optimize life-cycle performance from design inception (Correct answer)
- Multi-prime contracting, because separate contracts create competitive pressure
Correct answer: Design-build with a total cost of ownership requirement, because the integrated team can optimize life-cycle performance from design inception
Design-build with a total cost of ownership or life-cycle cost requirement allows the integrated team to make design decisions—envelope performance, system selection, controls—that optimize energy consumption over the building's life rather than minimizing first cost. Separating design from construction typically incentivizes first-cost minimization, not life-cycle performance.
Question 5: Which of the following sustainability strategies is most effectively deployed in a design-build project during the pre-design phase?
- Punch list completion and commissioning of energy systems
- Integrated passive design strategies such as building orientation, massing, and daylighting (Correct answer)
- Issuance of LEED certification by the U.S. Green Building Council
- Retainage release conditioned on energy performance metering
Correct answer: Integrated passive design strategies such as building orientation, massing, and daylighting
Passive design strategies—orientation to minimize solar heat gain, building massing for natural ventilation, and daylighting optimization—must be established during pre-design and schematic design. These decisions are difficult or impossible to change later. Design-build's early designer-builder collaboration makes pre-design the ideal phase to lock in high-impact passive strategies.
Question 6: In a design-build contract where the owner requires LEED Silver certification, who bears the risk if the project fails to achieve that certification?
- The U.S. Green Building Council, as the certifying body
- The owner, since certification depends on occupant behavior after turnover
- The design-builder, as the single point of responsibility for meeting the defined performance requirement (Correct answer)
- The commissioning agent, as an independent third party
Correct answer: The design-builder, as the single point of responsibility for meeting the defined performance requirement
When the owner specifies a LEED certification level in the contract, it becomes a performance requirement that the design-builder is contractually obligated to meet. As the single point of responsibility in design-build, the design-builder bears the risk of non-compliance—including potentially redesigning systems or paying liquidated damages—unless the contract explicitly allocates that risk elsewhere.
DBIA Sustainability and Green Building in Design-Build
Design-build is considered particularly well-suited for sustainable (green) building projects primarily because: