Emergent Team·June 6, 2026·5 min read

Mixed-use buildings—projects that combine retail, office, residential, and parking under one roof—are among the most challenging to meter for IECC compliance. Each occupancy type has different operating hours, different load profiles, different metering exemptions, and often different utility rate structures. Circuits from different use types frequently share the same panelboards. This post explains how to design a compliant monitoring system for mixed-use buildings using a combination of Panoramic Power wireless sensors, Leviton S7100 BCMs, and the PowerRadar unified front end.

Why Mixed-Use Buildings Are Uniquely Complex

A typical mixed-use building might have ground-floor retail, floors 2–8 as Class A office, floors 9–20 as residential apartments, and three levels of below-grade parking. The IECC treats each occupancy type differently. Commercial spaces (retail and office) over the applicable threshold require full end-use submetering. Group R-2 residential dwelling units are exempt from end-use submetering but require individual dwelling unit meters under Section C405.6. Parking garages have their own lighting and ventilation loads that must be categorized as exterior lighting and process loads respectively.

The electrical distribution system often does not respect these occupancy boundaries cleanly. A main switchboard may feed sub-panels that serve both retail and office floors. Emergency power distribution may span all occupancy types. HVAC central plant equipment (chillers, boilers, cooling towers) serves the entire building regardless of occupancy type. Designing a metering system that disaggregates energy by both end-use category and occupancy type requires careful circuit mapping and creative use of sensor placement.

Monitoring Strategy by Occupancy Type

Retail (Ground Floor)

Retail tenant spaces under 5,000 sqft with their own utility services and meters are exempt from end-use submetering. However, the landlord still needs to monitor common retail area lighting, HVAC serving retail zones, and any shared infrastructure. PAN-42 meters on dedicated retail HVAC units and PAN-10/12 sensors on retail lighting panels capture the retail contribution to building energy for BPS benchmarking and cost allocation.

Office (Floors 2–8)

Office floors require full IECC end-use submetering: HVAC, interior lighting, exterior lighting, plug loads, and process loads. Leviton S7100 BCMs at each floor's panelboard provide per-circuit monitoring across all branch circuits, with each circuit assigned to its appropriate end-use category in PowerRadar. PAN-42 meters on floor-level AHU or fan coil unit feeds capture HVAC energy by floor.

Residential (Floors 9–20)

Individual apartments are exempt from end-use submetering but require individual dwelling unit meters (C405.6). PAN-12 sensors on each unit's main circuit breaker provide total apartment consumption for tenant billing. Common area loads in residential floors (hallway lighting, elevator lobbies, trash compactors) are monitored with PAN-10 sensors and categorized separately in PowerRadar.

Parking (Below Grade)

Parking garage lighting is categorized as exterior lighting. Ventilation and CO exhaust fans are process loads. EV charging stations are separately metered under the 2024 IECC. PAN-10 sensors on lighting contactors, PAN-12 on exhaust fan circuits, and PAN-10 on each Level 2 EV charger capture all parking energy by end-use category.

Central Plant

The building's central chiller plant, boiler plant, and cooling towers serve all occupancy types. PAN-42 meters on each major piece of central plant equipment capture total HVAC energy. EES-301 BTU meters on chilled water and heating water risers to each occupancy zone enable proportional allocation of central plant energy to retail, office, and residential based on measured thermal energy delivery.

PowerRadar: One Platform for All Occupancy Types

PowerRadar's device group hierarchy enables multi-dimensional categorization. Each sensor can be tagged by both end-use category (HVAC, Lighting, Plug Loads) and occupancy type (Retail, Office, Residential, Parking, Central Plant). Reports can be filtered by either dimension, providing both IECC-compliant end-use reports and occupancy-based cost allocation reports from the same sensor data. Building owners see the complete picture; tenants see only their own consumption; property managers see the allocation breakdown.

Designing a mixed-use project? Contact Emergent Metering at 215-645-7141 for a metering strategy session. We'll help you navigate the occupancy-specific requirements and design a monitoring system that serves code compliance, tenant billing, and operational efficiency from a single unified platform.

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About Emergent Metering Solutions

Emergent Metering Solutions provides commercial and industrial metering hardware, installation support, and energy analytics services. We specialize in electric meters, water meters, BTU meters, compressed air meters, gas meters, and steam meters with Modbus RTU, BACnet IP, pulse output, and wireless communication options. Our Managed Intelligence services deliver automated reporting, anomaly detection, tenant billing, and AI-powered consumption forecasting. We support compliance with IECC 2021, ASHRAE 90.1-2022, NYC Local Law 97, Boston BERDO 2.0, DC BEPS, California LCFS, and EU CSRD requirements.

Contact our engineering team for meter selection guidance, system design, and project quotes.