| Sector | Code | zEPI | % better than CBECS | Methodology | Data Source |
| Commercial | Older than 1999 | 0% | Defined as baseline | ||
| Residential | Older than 1999 | 0% | Defined as baseline | ||
| Commercial | 90.1-1999 | 84 | 16% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2001 | 84 | 16% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2004 | 75 | 25% | Set at 25% improvement or zEPI 75 | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2007 | 72 | 28% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2010 | 58 | 42% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2013 | 54 | 46% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2016 | 50 | 50% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Commercial | 90.1-2019 | 48 | 52% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2003 IECC | 78 | 22% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2006 IECC | 75 | 25% | Set at 25% improvement or zEPI 75 | DOE Code Improvement Estimate Dashboard |
| Residential | 2009 IECC | 69 | 31% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2012 IECC | 56 | 44% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2015 IECC | 56 | 44% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2018 IECC | 55 | 45% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| Residential | 2021 IECC | 50 | 50% | DOE/PNNL percent savings improvement over previous code | DOE Code Improvement Estimate Dashboard |
| NECB 2011 | 45% | Using AIA values - don't have analysis available | Page 39 | ||
| NECB 2015 | 51% | Using AIA values - don't have analysis available | |||
| NECB 2017 | 55% | Using AIA values - don't have analysis available | |||
| Commercial | Oregon 2021 | 49 | 51% | Site Energy Index per PNNL Analysis | Commercial dashboard |
| Residential | Oregon 2021 | 56 | 44% | Site Energy Index per PNNL Analysis | Residential Dashboard |
| Commercial | Washington 2021 | 48 | 52% | ||
| Residential | Washington 2021 | 51 | 49% | 2021 IECC Energy Index for WA. State code would likely be higher | PNNL State-level results spreadsheets |
| Commercial | California Title 24 2019 | 50 | 50% | 90.1-2019 Energy Index for CA. T24 would likely be higher | PNNL State-level results spreadsheets |
| Residential | California Title 24 2016 | 53 | 48% | 2021 IECC Energy Index for CA. T24 would likely be higher | PNNL State-level results spreadsheets |
| Commercial | NYStretch 2018 | 48 | 52% | Percent energy savings over 90.1-2013 | PNNL/NBI Determination Analysis |
| Commercial | Massachusetts Stretch Code 2017 | 45 | 55% | Ten percent improvement over base code energy index | Base code Energy Index per PNNL Analysis |
| Commercial | Massachusetts Stretch Code 2020 | 42 | 58% | Ten percent improvement over base code energy index | Base code Energy Index per PNNL Analysis |
| Commercial | ASHRAE 189.1-2020 | 46 | 54% | 5% better than 90.1-2019 - From targeted 5% improvement in Building Performance Factors (BPF) | ASHRAE Standard 189.1 Text |
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