What Design & Build Contracts Are
Design & build contracts are project agreements where a single contractor (the design-and-build provider) is responsible for both design and construction / delivery of a project. Instead of the client hiring a designer and a builder separately, the client contracts one party to deliver the complete solution to an agreed scope, performance requirement, timeline, and price structure.
Why Design & Build Contracts Matter
Design & build is used to reduce coordination risk and accelerate delivery, especially in complex infrastructure projects like EV charging depots, parking facilities, and commercial electrification works.
– One accountable party for design + execution
– Faster delivery by overlapping design and construction phases
– Clearer responsibility for technical performance and compliance
– Reduced risk of “design vs install” disputes between separate suppliers
– Better cost predictability when scope and requirements are well defined
How Design & Build Contracts Work
A typical design & build structure includes:
– The client defines employer’s requirements (what the project must achieve)
– The contractor proposes a contractor’s design and delivery plan (how it will be achieved)
– The contractor manages subcontractors (civil works, electrical, networking, commissioning)
– Acceptance is based on tests, documentation, and agreed performance criteria
– Handover includes as-built drawings, certifications, and O&M documentation
Typical Use Cases in EV Charging Infrastructure
Design & build is common when the site owner wants a turnkey solution:
– Fleet depot charging (many bays, power constraints, operational deadlines)
– Commercial workplace charging in parking garages or campuses
– Retail / hospitality charging where construction and user experience must align
– Municipal projects with strict procurement requirements and compliance checks
– Grid connection upgrades combined with charger deployment
Key Components to Define Clearly
Design & build contracts work best when requirements and interfaces are explicit. Important areas include:
– Scope boundaries: what is included / excluded (chargers, civils, grid connection, signage)
– Performance targets: power per bay, uptime expectations, charging availability, response time
– Compliance: electrical standards, metering rules, cybersecurity requirements, accessibility rules
– Interfaces: who provides CPMS, payment, backend integration, networking, SIMs, fire safety
– Site power limits and load management rules (especially in depots)
– Testing and acceptance: commissioning steps, functional tests, documentation required
– Warranties and maintenance responsibilities (hardware vs installation vs software)
– Change control: how variations are priced and approved
– Timeline and liquidated damages (if used) for late delivery
Risk Allocation and Common Pitfalls
Because the contractor owns the design, risk allocation shifts compared to traditional contracting. Common pitfalls include:
– Ambiguous employer’s requirements leading to scope gaps and costly variations
– Unclear responsibility for utility approvals and grid connection timelines
– Underdefined civil works assumptions (trenching, reinstatement, permits)
– Missing detail on software ownership and backend obligations (CPMS, updates, data access)
– Acceptance criteria based only on installation completion, not operational performance
– Inadequate handover package (as-builts, certificates, commissioning reports)
How to Evaluate a Design & Build Offer
When comparing bids, focus on deliverability and risk, not only price:
– Clarity of scope and assumptions
– Evidence of similar projects delivered on time
– Quality of design approach (single line diagrams, protection coordination, load calculations)
– Approach to power management, future scalability, and expansion readiness
– Ongoing support model (SLA, spare parts, remote monitoring, escalation)
– Warranty structure and responsibility matrix across subcontractors
Related Terms for Internal Linking
– EPC contract
– Turnkey delivery
– Scope of works
– Employer’s requirements
– Commissioning
– Acceptance testing
– Change order (variation)
– Service level agreement (SLA)
– Depot power management