Why Commissioning Should Start with Plan Review

What is building commissioning supposed to verify?

Building commissioning (Cx) is a quality assurance process that verifies building systems perform according to the Owner's Project Requirements (OPR) and the Basis of Design (BOD). However, on the majority of projects, commissioning activities don't begin in earnest until construction is substantially complete, precisely the point at which system modifications are most expensive and schedule-disruptive.

The data supports the case for earlier involvement. Studies by the Building Commissioning Association (BCxA) show that design-phase commissioning review identifies 60% to 70% of issues that would otherwise be discovered during functional performance testing, at 1/10th the cost to resolve. A control sequence error caught during drawing review costs essentially nothing to fix (a revised specification paragraph). The same error discovered during functional testing requires reprogramming the building automation system, re-testing, and potentially modifying installed hardware, costs that typically range from $5,000 to $50,000 per system.

What should design-phase commissioning review cover?

Effective design-phase commissioning review goes beyond checking equipment selections against the BOD. It evaluates whether the construction documents provide sufficient information for systems to be installed, controlled, tested, and operated as intended:

• Control sequence completeness: The single most important element of design-phase Cx review is the evaluation of control sequences of operation. These sequences (typically in Division 25 or Division 23 of the specifications) describe exactly how each system should operate under all conditions, startup, normal operation, economizer mode, unoccupied mode, morning warm-up, alarm conditions, and failure modes. Incomplete or ambiguous control sequences are the #1 cause of commissioning failures. Design-phase review should verify that every mode of operation is addressed, that setpoints are specified (not left as "to be determined by contractor"), and that the sequences are consistent with the system configurations shown on the mechanical drawings.
• Sensor and monitoring point placement: Building automation system (BAS) point lists and sensor locations shown on drawings must support the control sequences specified. If the control sequence calls for supply air temperature reset based on zone demand, the drawings must show temperature sensors in the controlled zones and the BAS point list must include those inputs. Understanding how to read HVAC drawings helps verify these details. Missing sensors or monitoring points create systems that can't execute their control sequences, a problem that's trivial to fix on drawings but expensive to fix after conduit and wiring are installed.
• Testing and balancing (T&B) access: Every system that requires testing, adjusting, and balancing needs physical access for the T&B technician, test ports on ductwork, balancing valves on piping, and access panels in ceilings and walls. Construction documents frequently show systems without adequate T&B access provisions, forcing field modifications during commissioning. Design-phase review should verify that the drawings include T&B access for every system that requires balancing.
• System integration points: Modern buildings integrate multiple systems through the BAS, HVAC, lighting, security, fire alarm, and elevator systems all exchange information. Design-phase Cx review should verify that the construction documents clearly define the integration points, communication protocols, and responsibility assignments for each system-to-system interface. Missing integration details are a leading cause of commissioning schedule overruns.

Which ASHRAE documents define the commissioning framework?

The industry framework for commissioning is defined by two ASHRAE documents that outline when and how commissioning should occur throughout the project lifecycle:

• ASHRAE Guideline 0, The Commissioning Process: Establishes the framework for commissioning from pre-design through occupancy and operations. Guideline 0 explicitly calls for design-phase commissioning review at each design milestone (schematic design, design development, and construction documents). The review scope expands at each phase, from verifying that the schematic design aligns with the OPR, to verifying that the construction documents provide complete and coordinated information for all commissioned systems.
• ASHRAE Standard 202, Commissioning Process for Buildings and Systems: Provides the mandatory requirements for commissioning (as opposed to Guideline 0's recommendations). Standard 202 is increasingly referenced in building codes and green building programs (LEED, WELL, and various state energy codes). When Standard 202 is referenced in the project specifications, design-phase review becomes a contractual requirement, not an optional service.
• LEED and green building requirements: LEED v4.1 requires fundamental commissioning (a prerequisite) and offers additional credits for enhanced commissioning that includes design-phase review. The enhanced commissioning credit specifically requires that the Cx authority review the OPR, BOD, and construction documents, and document findings in a formal design review report. This credit is one of the most cost-effective in the LEED system because the design review process itself delivers tangible value regardless of the LEED certification.

Why is design-phase commissioning review hard to do thoroughly by hand?

The challenge of design-phase commissioning review is scope, a thorough review of every system on a large project can require 80 to 120 hours of senior engineer time. This time investment, combined with the compressed schedules of most design projects, means that design-phase Cx reviews are often limited in scope or performed under time pressure that reduces their effectiveness. AI-powered analysis tools can fundamentally change this equation:

• Systematic completeness checking: AI can verify that every piece of equipment shown on mechanical drawings has a corresponding control sequence, that every sensor referenced in the control sequences appears on the BAS point list, and that every system requiring T&B has access provisions shown on the drawings. These completeness checks are tedious for human reviewers but trivial for AI, and they catch the omissions that cause the most commissioning delays.
• Cross-discipline consistency: AI can cross-reference information across drawing sets to verify that electrical power provisions match mechanical equipment requirements, that structural openings accommodate MEP penetrations, and that architectural ceiling heights provide adequate space for the systems that must operate above them. These cross-discipline checks are where human reviewers are most likely to miss issues because they require simultaneous knowledge of multiple disciplines.
• Specification analysis: AI can analyze control sequence specifications for completeness, checking that all operating modes are addressed, that setpoints are specified (not "TBD"), and that the specified sequences are consistent with the system configurations shown on the drawings. Learning how to read specifications effectively is key to this process. This analysis would take a human reviewer hours per system, AI can check every system in minutes.

How does Helonic help with design-phase commissioning review?

Helonic's AI analysis provides the systematic, cross-discipline review that makes design-phase commissioning more thorough and more efficient. The platform checks for the completeness issues that commissioning agents typically discover during construction, missing control sequences, sensors not shown on drawings, and system integration gaps, and identifies them during the design phase when they can be resolved at minimal cost.

For commissioning agents, Helonic augments their expertise by performing the exhaustive completeness checks that are difficult to achieve under typical project timelines. For building owners, combining AI-powered analysis with expert commissioning review creates the most thorough design-phase quality assurance process available, catching issues before they become expensive field problems.

Design-Phase Commissioning FAQ