9.4 Establishing EBCx Scope & Preparing the EBCx Plan
Key Takeaways
- The October 2026 blueprint makes establishing the EBCx scope (3 questions) and preparing the EBCx Plan (2 questions) separate Domain 6 line items worth 5 questions before any field work.
- EBCx scope must be bounded in writing along six dimensions: physical boundary, system boundary, depth of investigation, measure boundary, implementation role, and verification rigor.
- Because ASHRAE Guideline 0.2-2015 is advisory rather than normative, EBCx scope has no standard compelling it and must be fixed contractually in the owner-provider agreement.
- Scoping inputs that must precede a fee proposal include 24 to 36 months of utility data, BAS trend capability, the owner's top operational complaints, available documentation, and operator staffing levels.
- Shutdown windows, seasonal dependencies, access and security restrictions, operator availability, and data quality are constraints that must be documented in the EBCx Plan, because discovering them mid-investigation is a planning failure rather than an unforeseeable event.
9.4 Establishing EBCx Scope & Preparing the EBCx Plan
Quick Summary: The October 2026 blueprint made two Domain 6 activities explicit line items: establish the scope of project (3 questions) and prepare the EBCx Plan (2 questions) — 5 of the domain's 28 questions before any field work begins. This is deliberate. Existing building commissioning fails far more often from bad scoping than from bad diagnostics: the provider investigates systems the owner does not care about, misses the systems driving the owner's complaint, or commits to savings the building cannot deliver. The Planning Phase is where those failures are prevented.
1. Why EBCx Scoping Is Harder Than New Construction Scoping
In new construction, scope is bounded by the contract documents: there is a defined set of new systems, a design intent, and a schedule. In an existing building, none of that is reliable:
- The building has been modified, often undocumented.
- The original design intent is obsolete, missing, or irrelevant to current use.
- Systems are in unknown condition, and their condition is what determines the level of effort.
- The owner's stated goal ("reduce energy") is often not the real driver ("the executive floor is too hot and I am tired of the complaints").
- There is no normative standard compelling scope. Guideline 0.2-2015 is advisory, so everything must be fixed contractually.
Start With the Owner's Actual Drivers
Before any technical scoping, the provider establishes which of the recognized EBCx drivers apply and in what priority:
| Driver | What it implies for scope |
|---|---|
| Energy cost and carbon reduction | Utility analysis, central plant, scheduling, resets, economizers |
| Comfort complaints and IEQ | Zone-level investigation, ventilation verification, terminal units, controls |
| Reliability and equipment life | Runtime analysis, short-cycling, maintenance practice, sequencing |
| Regulatory compliance (energy benchmarking or performance ordinances) | Metering, benchmarking documentation, defined measurement basis |
| Deferred maintenance and capital planning | Condition assessment feeding a capital plan rather than tuning |
| Transition from reactive to proactive maintenance | CMMS review, PM program, operator capability |
An owner who cannot rank these will get a project that satisfies none of them. Forcing the ranking is the provider's first substantive act.
Boundary discipline: EBCx optimizes what exists. When the investigation shows the real answer is equipment replacement, that finding is reported — but executing a capital retrofit is a different project with different economics. A scope that quietly slides from operational tuning into capital replacement is the classic EBCx scope failure.
2. The Dimensions of EBCx Scope
Scope must be pinned down along six dimensions, in writing:
- Physical boundary. Which buildings, floors, and areas. On a campus, whether central plant and distribution are included or only building-level systems.
- System boundary. Which systems: HVAC only, or lighting, domestic hot water, plug loads, envelope, vertical transportation, process loads.
- Depth of investigation. Documentation review only; documentation plus operator interviews and BAS trend analysis; or full field investigation with portable data logging and functional diagnostic testing.
- Measure boundary. Operational and low-cost only, or measures up to a defined capital threshold.
- Implementation role. Whether the provider only recommends, or also oversees implementation and verifies results. This single choice can double or halve the fee.
- Verification rigor. Whether savings are estimated by engineering calculation or verified under a defined M&V option, since IPMVP Option B or D verification costs far more than Option A.
Scoping Inputs That Should Precede the Fee Proposal
- 24 to 36 months of utility data, at minimum a bill summary
- Building age, area, use type, and occupancy schedule
- BAS make, version, point count, and trend capability — trend capability determines whether remote analysis is even possible
- A short list of the owner's top operational complaints
- Available documentation: drawings, sequences, prior studies, prior audits
- Staffing: how many operators, what shifts, what skill level
A provider who proposes an EBCx scope without these is guessing, and the guess is almost always low.
3. Preparing the EBCx Plan
The EBCx Plan is the Planning Phase deliverable. It is the existing-building analogue of the commissioning plan, and the blueprint weights it as its own task because it governs everything downstream.
Required Content
| Section | Content |
|---|---|
| Objectives and drivers | The owner's ranked drivers, stated as measurable goals |
| Current Facility Requirements | The CFR, or the plan and schedule to develop it |
| Scope | All six dimensions above, explicitly bounded, with exclusions named |
| Team and roles | Provider, owner representative, operations staff, contractors, and the specific time commitment expected from operators |
| Investigation methodology | Document review, interviews, utility analysis, trend analysis, field investigation, data logging, diagnostic testing — with the depth for each |
| Instrumentation plan | What will be measured, with what, for how long, and where loggers will be placed |
| Schedule | Phase durations, seasonal constraints, and access windows |
| Findings and measure documentation | The findings log structure and the format for measure recommendations |
| Screening and prioritization criteria | How measures will be ranked before they are proposed |
| Implementation approach | Who implements, and the provider's oversight role |
| Verification and M&V approach | Method and rigor for confirming results |
| Persistence and handover | What is transferred to operations, training, and the ongoing commissioning transition |
| Assumptions, constraints, exclusions | Explicitly stated — access limits, shutdown restrictions, data availability |
Constraints That Belong in the Plan Because They Will Otherwise Ambush You
- Shutdown windows. In hospitals, data centers, and laboratories, testing that interrupts service may be permitted only at defined times, sometimes only twice a year.
- Seasonal dependencies. Cooling diagnostics need cooling weather. A plan that ignores season will defer half its findings by a year.
- Access and security. Tenant spaces, secure areas, and occupied patient areas require notice and escorts that consume real schedule.
- Operator availability. Interviews and BAS access require operator time the facility may not be able to give. If the plan assumes 40 hours of operator support, the plan says so.
- Data quality. If the BAS cannot trend, or meters are broken, the investigation methodology must change and the plan must say what happens.
Exam pattern: a scenario describes an EBCx project that discovered a major constraint mid-investigation. The correct answer traces the failure to the Planning Phase — the constraint should have been identified and documented in the EBCx Plan — rather than treating it as an unforeseeable event.
4. The Plan Is a Living Document
Like the commissioning plan, the EBCx Plan is revised when the project learns something material: the investigation reveals a system in far worse condition than assumed, the owner changes priorities, a measure requires capital the scope excluded, or the CFR is revised. Each revision is dated, issued, and acknowledged by the owner. A plan that never changes over a nine-month EBCx project was not being used.
A commissioning provider proposes an EBCx scope for a 400,000 square foot research campus based on a walkthrough and the owner's statement that energy costs are too high. Three months into the investigation, the provider discovers that the building automation system cannot store trend data and that laboratory systems may only be interrupted during a two-week window each August. What is the correct assessment?
An owner engages a provider for existing building commissioning citing high energy costs. During operator interviews the provider learns that the real driver is a continuous stream of hot and cold complaints on two tenant floors that is jeopardizing a lease renewal. How should this affect scoping?
Midway through the Investigation Phase, field work reveals that the chilled water plant is in substantially worse condition than assumed and that meaningful improvement will require capital replacement rather than operational tuning. What should the provider do?