How to budget commissioning subcontract labor and retests

What does the commissioning subcontract budget actually buy?

Separate four cost owners before taking off hours: the owner-retained commissioning provider (CxP), general contractor (GC), installing trades, and specialist or original equipment manufacturer (OEM). The Building Commissioning Association Essential Attributes, approved April 20, 2018, places commissioning scope in the relevant contracts and specifications. Use the commissioning roles and turnover guide to establish those relationships, then give each purchased task a quantity.

The estimating unit is an equipment ID, approved scenario, attendance requirement and attempt. One uninterruptible power supply (UPS) startup visit does not buy five days of UPS functional and transfer support. Keep installation/startup, acceptance testing, functional testing, integrated systems testing (IST) and deferred testing on separate purchase lines.

This worked package covers a 1 MW, 480 V, unity-power-factor electrical campaign with mechanical restart observation. Its transfers use utility-fed electrical paths and approved bypass arrangements; the owner separately buys CxP witnessing and full thermal IST. Generator-backed outage scenarios require their own generator/IST package, including fuel, OEM attendance and reactive duty where specified.

ANSI/NETA ATS-2025 addresses suitability for initial energization of electrical equipment and systems. That acceptance-testing scope does not quantify later site IST staffing. Use data center commissioning levels to identify the phase, then price the specific deliverable.

What goes in an MEP commissioning bid matrix?

A mechanical, electrical and plumbing (MEP) bid matrix needs a purchaser as well as a performer. “Electrical contractor” alone leaves the rental invoice, controls integration and OEM visit entitlement unresolved.

Separate performing, witnessing and accepting

Under BCxA's 2018 role framework, the CxP manages the process and recommends acceptance; the assigned trade or specialist executes the test, and the owner accepts under its contract. BCxA requires written disclosure and management of conflicts where the CxP has other responsibilities or an indirect contract. Name the owner representative, switching personnel and OEM authority for each event without counting one person's attendance twice.

Table 1 gives Anvilfield's proposed buyout quantities and separate purchasers. Read the actual owner-furnished equipment purchase order to establish remaining vendor days and travel entitlements.

Complete the MEP interfaces

Testing, adjusting and balancing (TAB), cleaning, flushing, treatment, stable controls and OEM startup are mechanical prerequisites to price by equipment ID. The 80 mechanical hours here buy restart observation, not chiller, computer-room air-handler or coolant distribution unit capacity testing. UFGS 23 08 00, May 2023, Change 1 August 2024, provides the mechanical commissioning framework; the issued project specification establishes purchased tests and attendance.

This estimate assigns bank operation to one of the four electricians trained and experienced with the supplied configuration, as required by Simplex's Electra manual, revised June 8, 2021, page 4. Add a vendor operator when the rental agreement or approved method requires one. Keep factory witness travel, original startup, electrical acceptance testing, thermal IST, training and deferred visits as separate lines even when this package buys zero of them.

How do you turn the test list into paid labor hours?

Multiply people by paid attendance hours for each event, then add preparation and records. Anvilfield estimates 320 field person-hours from eight people working five 8-hour days, plus 80 preparation hours and 24 closeout hours, for 424 base person-hours. Field shifts include setup, briefing, loading, stabilization, script execution, reset and restoration.

Count rental calendar days separately from labor shifts. Equipment can continue accruing rent over a weekend or while an OEM resolves a failed test; the quotation defines minimum periods and daily or weekly billing. A two-hour scenario also needs its quoted callout, travel and site-access allowance.

Price the interfaces and data work

Identify the supplier responsible for each building management system (BMS), electrical power monitoring system (EPMS) and equipment-controller interface. Separate suppliers can require separate attendance even when one screen displays the results. Assign point lists, trend exports and sequence revisions using the BMS and DDC controls commissioning scope.

The estimate carries 24 base record hours and eight report hours per repeat day. Those quantities buy file assembly and test evidence beyond field attendance. Instrument configuration, common-clock verification and native-file export also need places in the field schedule.

What makes hours grow faster than MW?

Paths, connection moves, attempts, minimum vendor visits and simultaneous crews drive the takeoff. Doubling capacity on one connection differs from testing two independent halls concurrently. Rebuild those quantities before applying a campus capacity ratio.

The shown burdened rates assume 8-hour shifts without base travel or overtime premiums. Replace them with trade and OEM quotations and applicable wage/fringe obligations; add per diem, shift premiums, supervision, markup, tax, bonds and insurance where required by the bid.

How should the witness schedule protect the budget?

Book the crew only after the readiness and attendance requirements are resolved. UFGS 01 91 00.15, May 2023, Change 3 August 2024, section 1.16 offers editable readiness lead times of 30 calendar days or 20 working days and requires Government approval before scheduling. The issued selection controls; these are alternatives, not cumulative notice periods.

The schedule below selects the 30-calendar-day readiness option. Anvilfield's commercial planning inputs then place invitations 10 working days before testing, written reconfirmation six working days before, and the quoted cancellation cutoff five working days before. Replace those intervals with the booking agreement and project requirements. EC, MC and CC below identify electrical, mechanical and controls attendance.

The coordinator owns invitations and acknowledgments; the purchaser owns vendor cancellations. Add notice owner, acknowledgment, readiness approval date, cancellation cutoff and booking status to every event. Check UPS and STS commissioning hold points before releasing path A and path B bookings.

D6 and D7 require deferring D5 demobilization. A repair that lasts longer adds rental exposure outside those two execution days. Rebook after readiness and required attendance are confirmed, and price late cancellation from the agreement rather than assuming a free visit or automatic full-day charge.

What must the load-bank scope include?

Buy usable duty at the test boundary: voltage, frequency, kW, apparent power in kVA, reactive power in kvar, power factor, step size and duration. Then buy the accessories, location, auxiliary supply, operator and records that make that duty available.

Using Simplex's voltage-squared relationship, Anvilfield estimates about 680 kW output at 473 V from a fixed 700 kW resistive bank rated at 480 V, before other applicable deratings. Two such banks provide about 1,359 kW at that voltage, calculated before rounding the individual outputs. Measure voltage at the bank terminals and accepted load at the specified test boundary. Simplex technical guidance supplies the relationship.

Simplex's Load Bank Technical Data, checked November 5, 2026, gives 1,000 kW plus 750 kvar as the load required to reach 1,250 kVA at 0.8 lagging power factor. Anvilfield estimates balanced three-phase applied-load currents at 480 V of 1,203 A for 1,000 kW at unity power factor and 1,504 A for 1,250 kVA at 0.8 power factor, excluding auxiliaries.

Indoor resistive banks connected through the tested power chain also deposit heat in the room. Outdoor exhaust does not load the data hall, and electrical heaters do not directly prove a liquid-cooling heat-transfer path. Specify heat location and medium through the integrated systems test and CDU commissioning scopes.

Price the temporary connections

Assign temporary distribution, connection moves, switching, isolation, grounding/bonding, cable protection and restoration to the electrical scope. OSHA's 29 CFR 1926.417(b), checked November 5, 2026, requires deenergized construction equipment and circuits to be rendered inoperative and tagged at every energizing point. Include that work at each reconnection.

Simplex's Electra manual, June 8, 2021, page 9, lists a 5 kA short-circuit current rating for the bank and a 200 kA interrupting rating for its fuses. Specify available fault current and suitable assembly/protection at the connection point; fuse interrupting capacity alone does not qualify the bank. Size conductors and protection for the approved arrangement, including auxiliaries.

Preserve model-specific differences

Compare the required load increment and recording performance alongside capacity. Table 4 preserves the manufacturer's stated configurations.

Procure the listed voltage/frequency configuration. Standard Electra steps are nominal: using Simplex's voltage relationship, Anvilfield estimates a 5 kW resistive step at 480 V delivers about 4.86 kW at 473 V.

Electra weather resistance is an option on the manufacturer page; the outdoor rental selection here includes a suitable enclosure. The Electra manual, revised June 8, 2021, page 13 requires six feet of intake clearance on all sides and unobstructed overhead space; page 16 calls for approximately five minutes of fan cooldown before switching control power off. Its operational shutdown sequence governs the supplied configuration, not the product page's ten-second element-cooldown description.

One-second bank logging does not capture a subsecond transfer waveform. Specify analyzer performance against the accepted timing criterion and coordinate EPMS power monitoring exports. For a separately purchased generator acceptance package, assign reactive duty, fuel consumption by approved operating hours and tank refill to the standby generator scope.

Who pays when a commissioning test must be repeated?

In federal construction contracts incorporating FAR 52.246-12(e), Inspection of Construction, August 1996, the Government may charge the contractor additional inspection or testing costs when its declared work is not ready or prior rejection requires retesting. The clause supplies that federal allocation; a private subcontract needs its own applicable terms.

A cost reserve funds exposure without deciding fault. Separate nonconforming installed work, added owner scenarios, restricted access and rental-equipment failure before allocating the cost. UFGS 01 91 00.15, May 2023, Change 3 August 2024, section 3.10.4 requires aborting tests when a required team member is absent. Allocate the wasted visit under the contract's notice and attendance obligations.

Keep corrections, repeat tests and changes separate

UFGS 23 08 00, May 2023, Change 1 August 2024, section 3.10 requires correction before retesting in its specified application. Give correction and repeat testing separate work orders tied to one issue ID. An owner-added scenario receives its own field change-order takeoff and authorization.

FAR 52.243-4, Changes, June 2007, provides an adjustment mechanism for qualifying changes where incorporated. Preserve direction and follow the contract's notice and approval route: a CxP's technical request is not automatically a contracting officer's change order.

Define the allowance as a buyer-held reserve, a subcontract allowance reconciled to authorized actual quantities, or priced optional days. State event quantities, unit rates, approval authority, markup, supporting tickets, unused-balance treatment and authorization beyond the allowance. A budget provision alone does not alter correction obligations.

How much retest allowance should you carry?

Anvilfield estimates $21,580 for two additional 8-hour test days in its 1 MW utility-fed electrical commissioning support package, including eight-person field attendance, retained load banks and accessories, instrumentation, energy and repeat reports. This reserve funds one path-specific rerun and one transfer-scenario rerun after controls correction. Select project events from readiness, outstanding issues, interface changes, cancellation terms and OEM availability.

Match attendance to the accepted repeat-test boundary. A local point correction can use fewer people than an integrated transfer; changed sequences or protection settings can require wider verification. Have the CxP identify affected checks and prerequisites before releasing bookings.

Add returning crew, rental extensions, energy and report labor to price a repeat day. Add freight and travel when people or equipment have left. Keep correction work, waiting days and execution on separate cost codes.

What happens when sampling expands?

Under UFGS 01 91 00.15, May 2023, Change 3 August 2024, eligible samples contain at least three units; failures reaching 10 percent trigger a different equal-size second sample, and the same trigger there expands testing to every remaining unit. Apply section 3.10.3.2 only to equipment eligible under the issued specification.

Anvilfield estimates sampling exposure for 40 identical single-zone fan-coil units with identical controllers and a selected 25 percent sample. One failure among the first 10 triggers 10 different units; one failure there triggers the remaining 20. Thirty additional first-time tests, at two technicians for one hour each and $95/hour, add 60 person-hours and $5,700. Correction and reruns remain separate.

The same UFGS section specifies testing all central plant, primary air handlers, process cooling/heating and equipment serving multiple zones, with electrical testing at 100 percent except listed exceptions. Its selectable 25 or 50 percent sampling belongs to eligible identical single-zone groups. Do not transfer the fan-coil allowance to critical process cooling.

Should you retain equipment, and how is the reserve reconciled?

Anvilfield estimates $2,350 for one idle equipment day versus $4,000 for selected return freight and travel; two idle days cost $4,700. Dividing return cost by daily retention gives a crossover near 1.70 days before added return setup, minimum rentals, staff standby and schedule effects. Include vendor availability before off-renting.

Three idle repair days followed by one repeat day add $7,050 rental retention and $10,790 execution, or $17,840 before repair labor. The failed-script count alone does not establish rental duration.

Reconcile authorized attendance, rental extensions, metered energy and reporting against the allowance. One full repeat day consumes $10,790 of this $21,580 reserve; an actual-use agreement releases or credits the unused $10,790 as agreed. Fixed-price options follow their stated payment terms.

Worked estimate: a 1 MW electrical commissioning support package

The package uses five consecutive 8-hour shifts, two 700 kW banks and one mobilization. Both banks serve each electrical path in turn; connection moves are included in electrical hours. Mechanical technicians observe restart, with one controls integrator and one electrical OEM technician attending. Preparation and records are additional.

Applied-load energy is 19.6 equivalent hours at 1 MW, or 19,600 kWh. Selected combined bank auxiliaries average 10 kW for 40 hours, adding 400 kWh for 20,000 kWh total. Each repeat day budgets 3,920 applied-load kWh plus 80 auxiliary kWh, totaling 4,000 kWh; the script does not hold 1 MW through every staffed hour.

Method and sensitivities

Anvilfield estimates use the quantities, staffing, rates and rental periods shown, selected November 5, 2026. Base cost is person-hours times the stated rates plus equipment, logistics and energy; the retest reserve adds two complete repeat-day resource bundles. Manufacturer ratings and voltage behavior come from the cited Simplex and Avtron documents; replace the commercial inputs with project quotations and the approved test schedule.

Multiply each applied load by its duration, sum the resulting energy, add auxiliary consumption including cooldown, and apply the energy rate.

B = Σ(person-hours × rate) + Σ(rental units × days × rate) + freight + energy
R = extra test days × repeat-day cost + remobilization + separately priced idle time
Total = B + R
Energy cost = [Σ(applied kW × hours) + auxiliary kWh] × $/kWh

Every $10/hour increase across the 424 base person-hours adds $4,240 to Anvilfield's estimate.

How do you level bids that include different commissioning scope?

Add omitted scope before comparing offers. Table 8 uses Anvilfield estimates for both bids on the worked package's quantity basis.

A leveling addition is an estimator's comparison allowance, not an amendment to the bidder's contract. Resolve exclusions in an accepted scope exhibit and price before award. Compare quotation dates and validity, currency, wage/fringe basis, shifts, OEM travel, quantities, tax/markup treatment and remaining startup or warranty entitlements.

Attach the agreed scope exhibit, priced alternates and retest quantities to the public-contract bid packet. After the matrix resolves which subcontract buys each commissioning task, PorchRocket Bid Team prepares that public-contract packet with the company owner.

What changes for phased halls, seasonal tests and live sites?

Price every hall's mobilization, bank move, connection route, OEM attendance and acceptance record. Share rental capacity only when the look-ahead schedule establishes sequential testing. Simultaneously loaded halls cannot both use the same available bank capacity.

UFGS 23 08 00, May 2023, Change 1 August 2024, sections 3.12 and 3.13 contain selectable seasonal and full-load tests, including artificial loading where retained. Their selected report provisions require submission within 14 days of test completion. Price those visits as deferred obligations under the issued specification, with their own loading and reporting quantities.

An occupied site adds access windows, switching approvals, recovery planning and operations attendance. A missed access window changes bookings even if the equipment is technically ready.

Compare obligations before deleting a visit

Factory testing, original startup, NETA acceptance, functional verification and IST serve different evidence needs. Reconcile purchase-order entitlements against each phase before removing a visit. Resolve conflicting script criteria, OEM limits and project requirements through the authorized designer/owner clarification process before procurement; a larger load or longer hold is not automatically the correct choice.

Which commissioning exclusions must be resolved before award?

Turn each unchecked item into an assigned purchaser, a price or a written exclusion accepted by the procuring party. “By others” needs the other purchase order identified. Close the comparison against dated quotations and exact revisions of the scripts, equipment schedule and temporary connection concept.

• Name every equipment ID, path and scenario, including duplicate/redundant assets.
• State original installation checks and startup obligations separately from functional/IST attendance.
• Assign CxP, owner operations, trade and OEM attendance for every event.
• Confirm OEM prepaid days, travel, minimum callouts and additional-day rates.
• State shift length, weekends, overtime and night-work treatment.
• Identify notice, readiness, witness acknowledgment and cancellation terms.
• Specify kW, kVA, kvar, voltage, frequency, minimum step and measurement boundary.
• Verify bank capacity at expected terminal voltage, delivered steps, outdoor enclosure suitability and the approved test boundary.
• Assign cable routes, connection moves, switching/isolation, grounding/bonding, fault-duty verification, protection, auxiliary supplies and restoration.
• Assign bank operation, freight, unloading, rigging, footprint/clearances, floor loading, cooldown and the exact off-rent trigger.
• Identify where heat is deposited and whether airside or liquid-side load is required.
• Assign electricity, demand-charge exposure, generator fuel and final tank refill.
• Specify instrument performance, calibration evidence, clock alignment and data exports.
• Define retest execution quantities separately from defect correction and standby.
• Define rental retention, remobilization and phased-hall moves.
• Identify TAB, cleaning/flushing, plumbing/treatment, thermal load, specialist interfaces, selected seasonal/full-load visits, training and report deadlines.
• State cost authorization, retest cause record, allowance reconciliation and unused-balance treatment.

What records support retest payment and closeout?

Tie every repeat-test ticket to the project/system ID, script revision and step, original criterion and result, issue ID, cause, repair and authorization. Record actual attendance, equipment off-rent date, native instrument data and the witnessed repeat result. Payment approval does not establish a passed test.

BCxA's Essential Attributes, approved April 20, 2018, calls for documenting activities, issue resolution and deferred work. Keep corrected, awaiting verification and verified closed as distinct states. Labor-hour and per-diem records supply the commercial quantities alongside the technical evidence.

A filled repeat-test record

Worked record RT-01 identifies electrical path B, transfer script revision 3, event 4. The criterion is an EPMS active-path indication matching the switching record: expected path B, original indication path A, corrected repeat indication path B. Correction CW-01 remaps the tag; the owner/CxP authorizes the rerun after readiness confirmation. Attach time-aligned exports and the signed switching record.

The priced RT-01 event carries one 8-hour shift, 64 field person-hours, eight reporting hours, two retained banks, one cable package, one instrument package and 4,000 kWh budgeted energy. Anvilfield estimates $10,790 for that event. At execution, replace budgeted quantities with signed time tickets, rental confirmation and meter readings.

Close the commercial event after quantity reconciliation and the technical issue after witnessed acceptance. Retain signed test sheets, native files, final settings and sequence revisions, deficiency disposition, deferred-test dates and incurred-cost records through the punch list, closeout and turnover package. A causation dispute changes allocation, not the need to preserve the result.

Sources, estimate method and citation

Sources checked November 5, 2026. UFGS documents are editable guide specifications: use the selections in the issued project documents. Manufacturer requirements apply to the supplied model and configuration, and FAR examples apply where the clause is incorporated.

1. Building Commissioning Association, Essential Attributes. Approved April 20, 2018. Roles, scope and evidence.
2. ANSI/NETA ATS-2025 publisher scope. 2025 edition. Initial-energization acceptance testing.
3. UFGS 01 91 00.15, Building Commissioning. May 2023, Change 3 August 2024; UMRL October 2025. Sections 1.16 and 3.10.1-3.10.4.
4. Simplex, Load Bank Technical Data. Undated. Voltage relationship and reactive duty.
5. Simplex, Electra specifications. Undated. Ratings, steps, logging and enclosure options.
6. Avtron, In-Stock Load Banks. Publication 5650, Rev. -, 2024. Listed 4810 configuration.
7. Avtron, Model 8350. Publication 5040, Rev. I, 2025, as printed in the PDF. Voltage/frequency configurations and steps.
8. FAR 52.246-12, Inspection of Construction. August 1996 clause. Additional inspection/test cost and correction.
9. FAR 52.243-4, Changes. June 2007 clause. Authorized changes and adjustment mechanism.
10. UFGS 23 08 00, Commissioning of Mechanical and Plumbing Systems. May 2023, Change 1 August 2024. OEM support, retesting and deferred tests.
11. Simplex, Electra Load Bank Manual. Internal revision June 8, 2021. Pages 4, 7-9, 13 and 16; operator training, ratings, fault duty, placement and shutdown.
12. OSHA, 29 CFR 1926.417, Lockout and tagging of circuits. Current text checked November 5, 2026. Paragraph (b), deenergized construction equipment and circuits.

Update log: 2026-11-05: Article reviewed; temporary connections, fault-duty ratings, load steps and retest records clarified.

How to cite this page: Anvilfield, How to budget commissioning subcontract labor and retests, 2026, https://anvilfield.com/field-guides/datacenter/data-center-commissioning-subcontract-scope-retests/

Related tools

FAQ

People also ask

• What is commissioning in construction?
• What is an integrated systems test?
• What is a punch list in construction?
• How long does data center electrical commissioning take?
• What is an NFPA 110 acceptance test?