Sustainability
Sustainability tests whether you can frame environmental performance in cost, risk, and reporting terms, and support claims with a measurement baseline.
Framework
The triple bottom line covers economic, environmental, and social performance. The energy hierarchy runs in order: reduce demand through envelope, setpoints, and scheduling; improve efficiency through equipment and controls; decarbonise supply through renewables and grid choice. Carbon accounting separates Scope 1 direct fuel, Scope 2 purchased electricity and heat, and Scope 3 value-chain emissions including embodied carbon and commuting.
Standards and tools
ASHRAE 90.1 provides the energy code baseline; LEED and WELL are certification frameworks; ENERGY STAR Portfolio Manager benchmarks energy; ISO 50001 structures an energy management system; life-cycle assessment compares materials; green lease clauses align landlord and tenant incentives.
Worked example
A 100,000 square foot building uses 2,000,000 kWh a year, so energy use intensity is 20 kWh per square foot per year. A retrofit cuts consumption 12%, saving 240,000 kWh. At $0.12 per kWh that is $28,800 a year; against a $200,000 cost, simple payback is 6.9 years. Adding the emissions reduction from the grid factor and any utility rebate strengthens the case, but the payback is the first question a finance reviewer will ask, so lead with it and then present the carbon and risk benefits.
Operations
Commissioning and retro-commissioning typically recover meaningful savings by correcting controls and schedules rather than replacing equipment. Waste diversion, water fixtures, refrigerant management for high-global-warming-potential gases, and procurement criteria all sit within facility control.
Traps
- Claiming savings with no baseline or measurement method.
- Ignoring Scope 3 when setting targets.
- Treating certification as proof of operating performance.
- Forgetting that tenant consumption may sit outside the landlord's meter.