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A data centre construction project should move through a sequence of decision gates: define what the facility must support, prove that a site can deliver the required power and resources, coordinate the design and delivery plan, then commission the systems and prepare operations before acceptance. Starting with a site or a preferred design before agreeing the requirements can lock in costly constraints.
This guide follows that sequence from the first project brief to handover. Permits, codes, utility rules and approval timelines depend on the jurisdiction and project, so confirm them with the relevant authorities and specialists rather than treating any generic checklist as universal.
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What should you decide before choosing a site?
First define the facility’s purpose and the conditions it must meet. Site selection, equipment sizing and construction sequencing all depend on these requirements; without them, a site that looks attractive on paper may not support the intended workload or expansion plan.
Bring the owner, future operators, IT and network teams, facilities staff, finance, security, project leadership and other decision-makers into the brief early. Record their requirements and assumptions in an owner requirements document, project or program requirements document, and a basis of design (BoD). The NIH Sustainable Data Center Design Guide recommends establishing this planning foundation with stakeholders and revisiting design criteria as the project develops.
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At minimum, settle or explicitly mark as unresolved:
- Workload and capacity: What services and IT equipment will the facility support? What initial capacity, rack-density assumptions and growth phases should the design accommodate?
- Availability and maintenance: What operating outcomes and maintenance arrangements does the owner require? Describe the expected service and maintenance needs instead of relying on an unexamined label or assumption.
- Power and cooling expectations: What loads, density assumptions, cooling approach and heat-rejection needs should designers plan for? These are inputs to feasibility, not details to defer until equipment is ordered.
- Connectivity and security: What network pathways, connectivity characteristics and physical-security needs are required for the intended use?
- Sustainability and resources: What sustainability goals apply, and what constraints exist around water, energy and other site resources?
- Delivery constraints: What budget, target dates, procurement strategy, phasing and stakeholder approvals shape the project?
- Acceptance criteria: What evidence will show that systems meet the agreed design intent, and who has authority to accept the facility?
Distinguish firm requirements from assumptions. For example, an assumed future capacity is not the same as funded capacity, and proximity to electrical infrastructure is not confirmation that a utility can deliver power on the required schedule. Assign an owner to each open question and a date or decision gate by which it must be resolved.
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How do you assess and compare data centre sites?
Use the owner’s requirements to build a site scorecard, then verify its inputs with the utility, network providers, relevant authorities and qualified advisers. No single factor decides every project: the right weighting depends on the workload, operating model, local evidence and expansion needs.
Power deserves early, direct investigation. Ask the utility about deliverable capacity, required infrastructure, interconnection steps and the expected sequence for service. Do not treat a nearby substation, transmission line or existing industrial connection as proof of available capacity or a delivery date. ASHRAE’s site-planning guidance stresses early utility coordination, interconnection assessment and attention to equipment lead times.
Assess each candidate against the full operating and construction picture:
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- Land and expansion: Check whether the site can fit the intended building, supporting infrastructure, access and any planned phases. Reserve expansion options if the requirements call for them.
- Workload and density fit: Consider whether the site and proposed building arrangement can support the expected equipment and its power and cooling needs.
- Cooling and water: Establish resource availability and constraints, including local conditions that may affect the selected cooling and heat-rejection approach.
- Network connectivity: Assess available routes and the connectivity characteristics the workload requires. Confirm route options rather than assuming that a provider’s presence in the area guarantees a suitable connection to the site.
- Climate and hazards: Investigate relevant environmental conditions and exposure, including flood, seismic and wildfire risks where applicable. Determine how site conditions could affect design, construction, resilience and operations.
- Planning and community context: Identify zoning, environmental review, noise or other community concerns, and the approvals or conditions that could affect construction and operation.
- Maintainability and resilience: Consider how the site layout, access and infrastructure affect maintenance and the owner’s availability objectives.
- Cost and operating constraints: Compare project and operational implications, not only land acquisition or initial construction considerations.
Give each criterion a project-specific weight and record the evidence behind the rating. A simple score without evidence can hide uncertainty: a “good” power score, for example, is not meaningful if it is based only on proximity rather than a utility’s assessment. Keep assumptions, sources, unresolved questions and decision owners alongside the scores.
ASHRAE recommends considering power, workload, resources, hazards, permitting, stakeholders and phased growth as parts of site planning. Its guidance is useful for framing the investigation, but the answer for a particular location must come from local utility information, site studies and applicable authorities.
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How do you confirm feasibility and the approval path?
Before committing to a site or freezing the design, turn the site assessment into a project-specific feasibility and approvals plan. Requirements and timing vary by location, project scale and design; there is no universal permit list or dependable duration that can be applied to every data centre.
Build an approval and risk register with the relevant authorities and specialist advisers. Identify which decisions or agreements are needed and what each depends on. Investigate land-use and environmental reviews, utility connection agreements, water constraints, emissions or backup-generation matters where relevant, and conditions that may affect grading, construction, energization or occupancy. Confirm the responsible authority and applicable requirements for the project’s actual location.
Track dependencies, not just permit names. A utility decision may affect the electrical design and construction sequence; an environmental or land-use condition may affect site layout or grading; a water constraint may change the cooling approach. Record who will secure each approval, what supporting information is needed, and how an outstanding decision could affect cost, schedule or design.
Also maintain a risk register for matters that are uncertain rather than approved or resolved. Include the evidence available, the potential consequence, a responsible owner and the trigger for escalation. This helps distinguish a manageable open item from a condition that undermines the project’s feasibility.
How should the basis of design and construction documents be developed?
Translate the agreed requirements into coordinated design criteria, then develop site-specific construction documents that show how the facility is intended to perform. The basis of design should connect owner outcomes to the choices, interfaces and acceptance evidence used by the design and delivery teams.
Coordinate the disciplines rather than treating them as separate packages. Depending on the project, this includes electrical distribution and backup, mechanical systems and heat rejection, controls and monitoring, fire protection, structural design, security, network pathways, building layout, maintainability and phased expansion. Make interfaces and performance expectations explicit so each discipline is working from the same assumptions.
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The NIH guide identifies performance level, sustainability, budget, construction schedule, procurement strategy and stakeholder input as planning considerations. It also recommends planning for growth in power and cooling. Put these matters in the project requirements and design criteria, with clear ownership for unresolved items.
For each major system, the design team should make the intended operating behavior understandable: what it supports, what it depends on, how it is monitored, how it can be maintained, and what the owner expects when a component or service is unavailable. The precise criteria must come from the owner’s requirements, applicable codes and standards, equipment limitations and contractual obligations; they should not be guessed from a generic template.
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Review the BoD and documents iteratively. ASHRAE’s 2023 Handbook chapter on data centres and telecommunication facilities describes commissioning-provider review of the basis of design and construction documents, along with construction-phase inspections and verification. That review is most useful when assumptions and acceptance criteria are still visible and can be corrected, rather than after discrepancies have become installed work.
Agree how design changes will be reviewed. A proposed change should be checked for effects on system interfaces, capacity, procurement, permits, schedule, maintainability and commissioning. Record approved revisions in the project documents and ensure affected teams are working from the current information.
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Procurement and construction should follow the approved design and a coordinated delivery sequence. Align procurement packages, utility work, permits, site preparation, building work and system installation so that long-lead equipment and external dependencies are visible in the schedule.
Develop a procurement plan that identifies package boundaries, required submittals, review responsibilities and dependencies. Check that equipment selections and vendor information remain consistent with the approved design criteria. Equipment lead times are a planning risk to investigate early, but actual lead times depend on the project and supplier; do not use a generic estimate as a promise.
During construction, maintain coordination across site work, building construction, electrical and mechanical installation, controls, security, network pathways and IT interfaces. Use submittal reviews, site observations, commissioning checklists and a discrepancy log to check that installed work aligns with the design intent. Give each discrepancy an owner and disposition, and track it through correction or an explicitly accepted resolution.
Commissioning is part of this construction-phase control, not a final inspection added at the end. The ASHRAE Handbook chapter describes design and construction document review, site inspections, startup and checkout, and prefunctional verification. Plan those activities in the schedule, identify who provides and witnesses evidence, and coordinate access to systems and documentation before testing is due.
Changes in the field should follow the same control logic as design changes. Document what changed, why, who approved it and which drawings, operating procedures and test plans need updating. An undocumented substitution or control-sequence adjustment can leave operators with an inaccurate record and make a later test inconclusive.
What happens during data centre commissioning?
Commissioning verifies, in stages, that systems are installed and operate in line with the agreed requirements. It begins during planning and continues through design, construction, startup, testing and resolution of deficiencies; a successful equipment startup alone does not demonstrate that the whole facility will respond as intended.
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- Define the commissioning plan and criteria. Set expectations in the project brief and design process. Identify systems, roles, required records, test prerequisites, witnesses and acceptance criteria. Base scenarios on the owner’s operating assumptions and the facility’s design.
- Review design and documents. Check the basis of design and construction documents for consistency with the requirements, system interfaces and planned verification. Resolve questions while design changes are still manageable.
- Verify installation and readiness. During construction, inspect work and confirm that required documentation, controls and monitoring are available. Track discrepancies and confirm that prerequisites are met before startup or testing.
- Complete startup and checkout. Confirm that individual equipment and components have been installed and started according to the approved project procedures. Verify that controls and monitoring points are operating as intended.
- Perform component and system tests. Test equipment and then system behavior against the agreed criteria. Record results, deficiencies and corrective actions; retest where required by the acceptance plan.
- Run integrated systems testing. Exercise coordinated responses across systems using defined scenarios, including relevant abnormal conditions such as a power interruption. Confirm that the facility responds and recovers as intended while critical IT loads remain protected.
- Close deficiencies and document results. Resolve open items or obtain an explicit owner decision on their disposition. Preserve test records, approved changes and final system information for operations.
ASHRAE describes integrated systems testing (IST) as the culmination of acceptance testing: “Acceptance testing culminates with integrated systems testing (IST) to confirm that the overall site can respond to expected anomalies (e.g., power outages) and restore back to normal operations without impact to the critical loads (typically, computers and other ITE).” This is why the integrated test must be planned around actual design intent and carefully controlled; it is not simply another equipment-level check.
Define test scenarios and safe boundaries before execution. Coordinate responsible personnel, prerequisites, communication, monitoring, expected responses and recovery steps. The specific procedure must reflect the installed systems and project requirements; a scenario should not put critical loads or personnel at unnecessary risk. A tier designation or single successful test does not, by itself, prove every possible operating outcome.
The Uptime Institute Journal’s article on mission-critical commissioning discusses commissioning as a lifecycle process with defined roles. Align the commissioning provider, designers, contractors, vendors and owner early enough that responsibilities and evidence are clear before work reaches the test stage.
When is a data centre ready for owner acceptance?
Owner acceptance should be a deliberate operations-readiness decision, not a calendar date or a handover of keys. The owner should accept only when the agreed evidence is available, significant deficiencies have been resolved or formally dispositioned, and the people responsible for operating the facility are prepared for the systems they are receiving.
Before acceptance, review the project’s commissioning and construction records against its own criteria. Confirm that the required tests were completed, results were documented, discrepancies were closed or explicitly accepted, and relevant changes are reflected in the final information. Check that operators can access the monitoring and controls they need and understand the intended system behavior and escalation routes.
Prepare operations alongside construction. Confirm staffing strategy, operator training, operating procedures and maintenance planning. Training should cover the systems the team will actually operate, including controls, monitoring, maintenance interfaces and the documented response to relevant abnormal conditions. The owner’s procedures should match the installed configuration rather than an earlier design version.
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Use an acceptance review to make the decision visible: what criteria have been met, what evidence supports that conclusion, what remains open, who owns each remaining item and whether the owner accepts the residual risk. The acceptance checklist and legal obligations are project-specific; owners and local authorities establish applicable requirements. Keep the final decision tied to the original requirements and approved changes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What are the most common planning mistakes to avoid?
The most damaging planning errors are usually mismatches between assumptions, dependencies and acceptance evidence. Use the following checks as prompts for project review:
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- Choosing a site before proving power: Confirm utility capacity and connection requirements directly; geography alone does not establish deliverability.
- Deferring growth planning: Decide whether land, power and cooling need to support future phases, and carry those assumptions into the design rather than treating expansion as an afterthought.
- Scoring sites on incomplete evidence: Label uncertain inputs and verify them. Do not let a high score conceal unconfirmed utility, water, network or approval assumptions.
- Designing from generic criteria: Derive performance and availability expectations from the owner’s workload and operating model, and confirm the codes, standards and contractual criteria that apply.
- Treating commissioning as a final event: Include commissioning roles, reviews, checklists, test prerequisites and deficiency tracking in design and construction planning.
- Testing equipment but not interactions: Plan integrated scenarios that check how systems respond together and recover under the conditions the owner considers important.
- Handing over incomplete operational knowledge: Align final records, controls, training and maintenance planning with the installed facility before the owner accepts it.
These checks do not replace engineering judgment, local approvals or project-specific requirements. Their purpose is to expose dependencies early enough for the project team to make informed decisions.
How can you keep the project on track from brief to handover?
Run the project through explicit gates, each with evidence and an accountable decision-maker. The sequence below is a practical governance model, not a universal statutory process.
| Gate | Decision to make | Evidence to carry forward |
|---|---|---|
| Requirements | What must the facility support? | Owner requirements, basis of design inputs, growth assumptions, stakeholder roles and change control |
| Site selection | Which candidate best fits the requirements? | Evidence-backed scorecard covering power, land, cooling and water, connectivity, hazards, approvals and expansion |
| Feasibility | Can the site and approval path support delivery? | Utility and resource findings, approvals and risk register, dependencies and unresolved decisions |
| Design and procurement | Are the coordinated design and packages ready to deliver? | Reviewed design documents, interfaces, procurement plan, schedule dependencies and commissioning plan |
| Construction and commissioning | Does installed work meet the agreed criteria? | Inspection, startup, checkout and test records; discrepancy status; integrated test results |
| Operations acceptance | Is the owner prepared to operate the facility? | Closed or accepted deficiencies, final records, trained personnel, procedures and owner acceptance decision |
At every gate, state what is known, what remains uncertain, who owns the next action and what would cause the project to revisit an earlier decision. This discipline helps preserve the connection between the original need, the built systems and the evidence used to accept them.
Frequently Asked Questions
Does a data centre project need a commissioning provider from the start?
The cited ASHRAE material describes commissioning-provider review of design documents as well as construction and testing activities, so involving the commissioning role early can inform criteria, interfaces and evidence planning. The owner’s procurement strategy determines the appointment and scope; the important point is to assign the work and responsibilities before testing is imminent.
Can a data centre be built near a substation and still lack power?
Yes. Physical proximity does not establish that capacity is available, that interconnection work is complete, or that service can be delivered on the project’s required schedule. Obtain project-specific information from the utility.
Which building codes and standards apply to a data centre?
That depends on the project’s jurisdiction, the editions adopted there, the authority having jurisdiction, the owner’s requirements and any contractual certification criteria. Confirm the applicable editions at design issue and again before commissioning rather than assuming a source document establishes local compliance.
How long does data centre construction take?
There is no reliable universal duration for an unspecified project. Site approvals, utility connections, equipment availability, design scope, phasing and local conditions all affect the schedule, so build a project-specific plan around verified dependencies rather than a generic estimate.
