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How long does a commercial energy audit take?

For a typical C&I facility, the on-site assessment takes one to two days. Utility data analysis and report preparation typically add two to four weeks. Total time from engagement to final report delivery is usually three to six weeks.

UpdatedJune 2026
Read time4 min read
CategoryCommercial Energy Audits
Reviewed byGI Engineering
Clear answer

Clear answer, explained.

The site assessment component — walkthrough, equipment inspection, thermal imaging, and data logging — is typically completed in one to two days for a mid-size commercial or industrial facility. Larger facilities with multiple buildings, complex process equipment, or extensive HVAC zoning may require additional site time.

The analysis and report preparation phase takes two to four weeks following the site assessment. This includes calibrating the energy model against interval data, quantifying each identified conservation measure, and preparing the incentive eligibility summary. The timeline is driven by data availability — facilities that provide 12–24 months of interval utility data before the site visit consistently reach report delivery faster.

We coordinate site access around production schedules and operational requirements. The assessment does not require operational downtime — it is conducted while the facility is running normally, which is necessary to capture representative operating conditions.


Key points

What this means in practice.

  • Site assessment for a typical C&I facility takes one to two days
  • Larger facilities with multiple buildings or complex process equipment may require additional site time
  • Report preparation adds two to four weeks following the site visit
  • Total engagement-to-report timeline is typically three to six weeks
  • Providing 12–24 months of interval utility data before the site visit accelerates delivery
  • The assessment is conducted during normal operations — no downtime is required

When this applies

Best-fit environments.

  • You are planning a capital budget cycle and need to know when the audit report will be available
  • Your facility operates around tight production schedules and site access needs to be coordinated
  • You are working toward an IESO saveONenergy application deadline and need to plan backwards
  • You have a BEPS compliance timeline and need the energy baseline documented within a specific window

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