Retrofit Priority Stack for Existing Buildings

Last verified: August 22, 2026. By Will Tygart.

Do the stack in order unless engineering says otherwise. Most wasted CapEx in existing buildings is a plant replacement that never got metering, controls, or load reduction first.

1. Measure – metering, ESPM hygiene, LL84 as the LL97 spine
2. Controls and operations – schedules, setpoints, BMS basics
3. Load reduction – envelope, lighting, plug loads
4. Efficient thermal – plant optimization, heat recovery
5. Electrification readiness – electrical capacity, heat-pump pathways
6. On-site / off-site clean energy tools – only after load work; document claims carefully
7. Resilience co-benefits – backup, heat resilience (BC playbook)

NYC twist

Run the $268 calculator and 2030 scenarios before major plant decisions so you don’t optimize for the wrong decade. A 2026-compliant building can still be a 2030 problem at the same EUI.

Boards: tie the stack to a resolution and a reserve study, not a single vendor pitch. See the co-op / condo playbook.

Related reading: LL84 benchmarking as the LL97 prerequisite, 2030 cap tightening by property type, and good-faith strategies when you miss the cap. Sister hubs: Restoration Intel, Healthcare Facility Hub, Continuity Hub, Risk Coverage Hub, and Tygart Media.