A building energy audit is the most direct path to identifying where your commercial property is wasting energy, inflating operating costs, and falling short of sustainability targets. Whether you are pursuing an ASHRAE Level 1 walk-through assessment or a detailed Level 3 investment-grade analysis, a structured checklist ensures your team captures every critical data point — from utility bill benchmarking and envelope deficiencies to HVAC performance gaps and lighting inefficiencies. Track energy audit findings and corrective work orders with OxMaint's Compliance & Audit tools.
1. Pre-Audit Data Collection and Baseline Establishment
Before any site walkthrough begins, assembling accurate historical data is essential. The quality of your energy audit is directly proportional to the completeness of the baseline information you gather upfront. Sign up free to start organizing your pre-audit data collection in OxMaint. Gaps in utility data or missing equipment schedules will produce unreliable energy conservation measure (ECM) projections that cannot withstand owner or lender scrutiny.
Collect 24–36 Months of Utility Bills
Gather electricity, natural gas, steam, chilled water, and water utility bills for a minimum of two to three years. This window captures seasonal variation, identifies anomalous consumption spikes, and provides the consumption baseline required to calculate energy use intensity (EUI) for ENERGY STAR benchmarking.
Obtain Building Drawings, Equipment Schedules, and As-Builts
Request architectural floor plans, mechanical and electrical as-built drawings, and equipment schedules from the owner's document repository. These documents reduce field measurement time, confirm installed capacities, and allow the auditor to cross-reference design intent against actual observed operating conditions during the walkthrough.
Document Building Occupancy Schedules and Use Patterns
Record the actual occupancy schedule for each major building zone, including weekday, weekend, and holiday patterns. Confirm any recent changes in tenant mix, operating hours, or plug load density that may have shifted baseline energy consumption away from historical utility bill averages.
Calculate and Benchmark Energy Use Intensity (EUI)
Compute the building's current EUI in kBtu per square foot per year across all fuel sources. Compare against the CBECS national median for the applicable building type and climate zone to quantify the performance gap and prioritize audit scope toward the highest-impact end uses driving above-median consumption.
2. Building Envelope Assessment
The building envelope — walls, roof, windows, doors, and below-grade surfaces — is the thermal boundary between conditioned interior space and the outdoor environment. Envelope deficiencies are among the most persistent sources of heating and cooling load in commercial buildings, yet they are frequently underweighted in audits that focus primarily on mechanical equipment. Book a demo to see how OxMaint helps teams document and track envelope findings across multi-building portfolios. A thorough envelope assessment often reveals ECMs with payback periods well under ten years.
Inspect Roof Assembly for Insulation Continuity and Air Leakage
Assess the roof assembly for insulation type, estimated R-value, and visible signs of moisture intrusion or thermal bridging. Use infrared thermography where available to identify areas of wet insulation or bypassed insulation layers that create localized heat loss pathways invisible to standard visual inspection.
Evaluate Window and Glazing Performance
Record glazing type, estimated U-factor, solar heat gain coefficient (SHGC), and frame condition for representative window assemblies. Note any failed sealed units, gaps in perimeter sealant, or single-pane glazing remaining in the building stock that contribute disproportionately to conductive and solar heat gain loads.
Check Air Sealing at Penetrations, Joints, and Service Entries
Inspect pipe and conduit penetrations through the building envelope, expansion joints, loading dock doors, roof hatches, and entry vestibules for deteriorated sealants or missing air barriers. Infiltration through uncontrolled openings is a leading source of latent cooling load in humid climates and sensible heat loss in heating-dominated climates.
Assess Below-Grade and Slab-on-Grade Insulation Conditions
Examine basement walls, slab edges, and below-grade perimeter conditions for insulation presence and continuity. Uninsulated slab edges and basement walls in heating-dominant climates often represent a cost-effective insulation retrofit opportunity with simple payback periods of five to eight years.
3. HVAC Systems Evaluation
Heating, ventilation, and air conditioning systems typically account for 40 to 60 percent of total energy consumption in commercial buildings. A rigorous HVAC assessment during an energy audit goes beyond equipment age and nameplate efficiency — it examines actual operating conditions, control sequences, maintenance history, and distribution system performance to identify both low-cost operational improvements and capital ECMs. Book a demo to see how OxMaint automates your HVAC preventive maintenance scheduling and audit tracking.
Record Equipment Nameplate Data, Age, and Installed Efficiency
Document make, model, serial number, rated capacity, installed efficiency (EER, COP, AFUE, or SCOP), and estimated age for all major HVAC equipment. Cross-reference nameplate efficiencies against current ASHRAE 90.1 minimums to quantify the efficiency gap and estimate annual energy penalty from retaining below-standard equipment.
Review BAS/BMS Control Sequences and Setpoint Schedules
Access the building automation system to review active control sequences, occupied and unoccupied setpoint schedules, economizer enable logic, and demand-controlled ventilation programming. Setpoint drift, disabled schedules, and overridden economizer sequences are among the most common no-cost and low-cost energy savings opportunities found in commercial HVAC systems.
Inspect Ductwork, Piping Insulation, and Distribution Losses
Examine accessible ductwork sections and hydronic piping for insulation continuity, joint sealant condition, and evidence of air or fluid leakage. Uninsulated hot water distribution piping in unconditioned spaces and leaking supply ductwork in return-pressure plenums are frequently identified as high-priority ECMs in commercial energy audits.
Evaluate Variable Speed Drive Opportunities on Fans and Pumps
Identify constant-speed fans and pumps serving variable-flow systems that lack variable frequency drives (VFDs). Applying VFDs to chilled water pumps, condenser water pumps, cooling tower fans, and air handling unit supply fans is one of the highest-ROI ECMs available in commercial buildings due to the cubic relationship between speed and power consumption.
Assess Chiller and Boiler Plant Operating Efficiency
Review chiller plant performance logs or trend data for part-load efficiency (kW/ton), condenser supply temperature, approach temperatures, and staging sequences. For boiler plants, confirm flue gas analysis has been performed recently and evaluate opportunities for condensing boiler replacement, flue damper installation, or hot water reset controls.
4. Lighting Systems and Electrical Load Assessment
Lighting and plug loads collectively represent 25 to 40 percent of commercial building electricity consumption, with significant variation by occupancy type. Sign up free to build and manage your lighting audit program in OxMaint. Lighting retrofits to LED technology and advanced controls consistently deliver simple payback periods of two to five years and remain among the most reliably cost-effective ECMs available across all ASHRAE audit levels.
Inventory Lighting Fixture Types, Wattages, and Operating Hours
Catalog all interior and exterior lighting fixture types, lamp wattages, ballast or driver types, and estimated daily burn hours by zone. Use this inventory to calculate total connected lighting power density (LPD) in watts per square foot and compare against ASHRAE 90.1 allowances for each space type.
Evaluate Occupancy Sensor and Daylight Control Coverage
Identify spaces that lack occupancy-based or daylight-responsive lighting controls, particularly private offices, conference rooms, restrooms, storage areas, and perimeter zones with significant glazing. Quantify the estimated operating hour reduction from adding controls to determine whether the ECM meets the investment threshold for the audit level being performed.
Survey Major Plug Load and Process Equipment
Identify high-wattage plug load equipment, including server rooms, copiers, vending machines, kitchen equipment, and lab or medical devices. Note equipment that operates continuously or outside occupancy hours and evaluate whether ENERGY STAR-rated replacements, smart power strips, or automated shutdown controls could reduce parasitic or idle-mode consumption.
Review Electrical Panel and Transformer Efficiency
Document dry-type transformer nameplate efficiency and loading levels. Transformers operating significantly below rated load experience disproportionate core losses and may be candidates for downsizing or replacement with high-efficiency units. Confirm that power factor correction capacitors are sized and functioning correctly to minimize reactive power charges on utility bills.
5. Water Heating and Domestic Plumbing Systems
Domestic hot water systems are frequently overlooked in commercial energy audits despite representing five to fifteen percent of total energy consumption in hospitality, healthcare, and food service properties. Improving water heating efficiency through equipment upgrades, pipe insulation, and occupancy-based controls can produce meaningful utility savings with short payback periods. Book a demo to explore how OxMaint tracks water system maintenance and audit findings in one place.
Assess Water Heater Efficiency, Capacity, and Standby Losses
Record water heater type, fuel source, rated efficiency (UEF or thermal efficiency), capacity, and age. Inspect tank insulation condition and pipe insulation on the first three feet of hot and cold connections. Evaluate whether condensing water heater technology, heat pump water heaters, or solar thermal pre-heat systems are viable ECMs based on load profile and available space.
Evaluate Hot Water Recirculation Loop Controls
Confirm that domestic hot water recirculation pumps operate on occupancy-based timers or demand-controlled activation rather than continuous operation. A recirculation pump running 24 hours per day in a facility with 10 hours of actual occupancy represents an immediately addressable operational waste with near-zero implementation cost.
Inspect Faucet, Showerhead, and Toilet Fixture Flow Rates
Measure or verify flow rates on representative faucets, showerheads, and pre-rinse spray valves against WaterSense program benchmarks. In properties with high domestic hot water demand, low-flow fixture retrofits reduce both water consumption and water heating energy simultaneously, with combined utility savings often justifying investment on a standalone basis.
6. Renewable Energy and Demand Management Opportunities
A comprehensive ASHRAE Level 2 or Level 3 energy audit should include a preliminary assessment of on-site renewable energy potential and demand charge management strategies. As utility rate structures increasingly weight peak demand charges, strategies to flatten load profiles — whether through battery storage, load shifting, or demand response participation — are becoming central to commercial energy cost optimization. Get started free to track renewable energy ECMs and demand management actions across your portfolio.
Evaluate Rooftop and Carport Solar PV Feasibility
Assess roof area, structural capacity, shading obstructions, and available solar resource using NREL PVWatts or equivalent tool. Determine the net metering or interconnection policy applicable to the property's utility territory and calculate a preliminary system size, annual generation estimate, and simple payback range to include as an ECM in the audit report.
Analyze Utility Rate Structure for Demand Charge Reduction Potential
Review interval meter data or 15-minute demand readings to identify the peak demand events driving the highest monthly demand charges. Evaluate whether pre-cooling strategies, HVAC load cycling, lighting load reduction, or battery energy storage systems could shave peak demand and reduce demand charges without impacting occupant comfort or operations.
Identify Demand Response Program Enrollment Eligibility
Contact the local utility or grid operator to determine whether the building qualifies for commercial demand response programs that provide bill credits or incentive payments in exchange for agreeing to curtail load during grid stress events. Large commercial properties often qualify for programs offering significant annual incentive revenue with minimal operational impact.
7. Audit Reporting, ECM Prioritization, and Implementation Tracking
The value of an energy audit is only realized when findings are translated into a prioritized action plan with defined ownership, implementation timelines, and performance tracking protocols. A well-structured audit report supported by a CMMS or energy management platform ensures that identified ECMs are tracked to completion — not filed away and forgotten. Learn how OxMaint centralizes energy audit findings and ECM tracking for commercial portfolios.
Classify Each ECM by ASHRAE Level and Implementation Cost Tier
Categorize identified energy conservation measures into no-cost operational improvements, low-cost retrofit measures, and capital investment projects. For each ECM, document estimated annual energy savings (kBtu and dollars), implementation cost, simple payback period, and applicable utility incentive programs to support owner prioritization decisions.
Develop an Energy Model for Level 2 and Level 3 Audits
For ASHRAE Level 2 and Level 3 audits, calibrate an hourly energy simulation model against actual utility consumption to within ASHRAE Guideline 14 tolerance. Use the calibrated model to evaluate interactive effects between ECMs, quantify combined energy savings with higher confidence, and support investment-grade financial analysis required by lenders or energy services companies.
Assign Implementation Owners and Target Completion Dates
Assign a responsible party and target completion date to each approved ECM before the audit report is finalized. No-cost and low-cost measures should be implemented within 30 to 90 days of audit completion. Capital projects should be entered into the capital planning calendar with defined procurement milestones to prevent approved measures from stalling in the approval backlog.
Establish Post-Implementation Measurement and Verification Protocol
Define the measurement and verification (M&V) approach for each significant ECM following IPMVP Option A, B, or C methodology as appropriate. Establish baseline and post-installation meter reading schedules, performance indicators, and reporting intervals so that realized savings can be compared against audit projections and reported to ownership, lenders, or sustainability certification bodies.
Frequently Asked Questions
Below are the most common questions facility managers and property teams ask about commercial building energy audits, ASHRAE audit levels, and energy conservation measure implementation.
ASHRAE Level 1 is a walk-through assessment that benchmarks energy use, identifies no-cost and low-cost improvements, and provides a preliminary list of ECMs with rough savings estimates. Level 2 is a detailed energy survey and analysis that includes a more rigorous site survey, energy use breakdowns by end use, and ECMs with defined savings and payback calculations. Level 3 is an investment-grade audit that adds calibrated hourly energy modeling, detailed cost estimates, and the financial rigor required to support performance contracting or large capital investments.
Most energy consultants and benchmarking programs recommend a full energy audit every three to five years for commercial properties, with an annual review of utility bill benchmarking data to detect performance drift between audits. Major equipment replacements, tenant mix changes, building additions, or significant increases in EUI should trigger an unscheduled audit regardless of the time elapsed since the last assessment.
Energy use intensity (EUI) is the total annual energy consumption of a building divided by its gross floor area, expressed in kBtu per square foot per year. EUI is the primary metric used to compare building energy performance across a portfolio and against national medians through the ENERGY STAR Portfolio Manager platform. A high EUI relative to peer buildings of the same type signals audit-worthy performance gaps and is often required for disclosure under state or municipal benchmarking ordinances.
Before a site visit, collect 24 to 36 months of utility bills for all energy sources, building floor plans and equipment schedules, the most recent preventive maintenance records for HVAC and lighting systems, current BAS trend data or control sequences if available, any previous energy audit reports, and current occupancy schedules and lease terms. Assembling this data package in advance significantly reduces field survey time and improves the accuracy of ECM savings calculations.
Platforms like OxMaint allow facility and energy teams to log audit findings directly as corrective work orders, assign ECMs to responsible technicians or contractors with target completion dates, track implementation status in real time, and generate performance reports that compare pre- and post-retrofit utility consumption. This ensures that the investment in an energy audit translates into implemented savings rather than recommendations that stall in a spreadsheet.
