Resources/Regulations

expandingNational (model standard adopted by jurisdictions)

ASHRAE Standard 100

ANSI/ASHRAE/IES Standard 100-2024: Energy and Emissions Building Performance Standard for Existing Buildings

Overview

Applies To

All existing buildings, building complexes, and portions of buildings (excluding industrial/agricultural processes)

Building Size Threshold

No minimum (applies to all existing buildings when adopted by jurisdiction)

Building Types

Residential, commercial, multifamily, institutional, industrial (excluding industrial processes)

Effective Date

2024 (published); adoption varies by jurisdiction

Jurisdiction

National (model standard adopted by jurisdictions)

State

National

Current Status

ASHRAE 100-2024 is the model BPS for existing buildings. Revised to include both energy efficiency and carbon emissions requirements. Increasingly adopted by state and local jurisdictions as the technical basis for their own BPS policies.

Key Deadlines

2024

Standard 100-2024 published with updated energy and emissions targets

Varies

Compliance deadlines set by adopting jurisdictions

Penalties & Enforcement

Penalty

Set by adopting jurisdiction

Penalties determined by adopting jurisdictions; the standard itself provides a framework for enforcement procedures

Compliance Requirements

Meet energy use intensity (EUI) targets by building type and climate zone

Meet greenhouse gas emissions intensity targets

Implement energy management and monitoring programs

Maintain building operations and maintenance per standard procedures

Periodic energy audits and recommissioning

Data Required

12 months of energy consumption data by source

Building gross floor area and use type

Climate zone classification

Emissions factors for local grid and fuel sources

Building envelope and systems documentation

How to Submit

Submission Method

Determined by adopting jurisdiction

Submission Format

Standard provides technical framework; submission format set by adopting authority

Official Resources

Official National (model standard adopted by jurisdictions) Resource

https://www.ashrae.org/technical-resources/bookstore/standard-100

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