{
  "meta": {
    "source": "U.S. Department of Energy, Building Energy Codes Program",
    "sourceUrl": "https://www.energycodes.gov/sites/default/files/2026-06/StateLevelResidentialCodesEnergyUseIndex.xlsx",
    "retrieved": "2026-08-23",
    "note": "Residential energy code status as published by DOE (workbook \"As of June 2026\"); local jurisdictions may amend or enforce different editions. Home-rule states have no single statewide residential energy code — see per-state notes.",
    "missing": []
  },
  "states": {
    "AL": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2016-10-01",
      "adoptionDate": "2016-10-01",
      "notes": null
    },
    "AK": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "AZ": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "AR": {
      "residentialCode": "2009 IECC with amendments",
      "effectiveDate": "2015-01-01",
      "adoptionDate": null,
      "notes": null
    },
    "CA": {
      "residentialCode": "2025 Building Efficiency Standards",
      "effectiveDate": "2026-01-01",
      "adoptionDate": "2024-12-17",
      "notes": null
    },
    "CO": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "CT": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2022-10-01",
      "adoptionDate": "2022-10-01",
      "notes": null
    },
    "DE": {
      "residentialCode": "2024 IECC",
      "effectiveDate": "2026-04-11",
      "adoptionDate": "2026-03-10",
      "notes": null
    },
    "DC": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2020-05-29",
      "adoptionDate": "2020-05-29",
      "notes": null
    },
    "FL": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2023-12-31",
      "adoptionDate": null,
      "notes": null
    },
    "GA": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2020-01-01",
      "adoptionDate": null,
      "notes": null
    },
    "HI": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2020-12-15",
      "adoptionDate": "2020-12-15",
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "ID": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2021-01-01",
      "adoptionDate": "2020-04-02",
      "notes": null
    },
    "IL": {
      "residentialCode": "2024 IECC with amendments",
      "effectiveDate": "2025-11-30",
      "adoptionDate": "2025-11-30",
      "notes": null
    },
    "IN": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2019-12-26",
      "adoptionDate": "2019-12-26",
      "notes": null
    },
    "IA": {
      "residentialCode": "2012 IECC with amendments",
      "effectiveDate": "2014-06-01",
      "adoptionDate": "2014-03-12",
      "notes": null
    },
    "KS": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "KY": {
      "residentialCode": "2009 IECC",
      "effectiveDate": "2014-10-01",
      "adoptionDate": "2014-02-01",
      "notes": null
    },
    "LA": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2023-07-01",
      "adoptionDate": "2022-06-22",
      "notes": null
    },
    "ME": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2025-04-07",
      "adoptionDate": "2025-01-07",
      "notes": null
    },
    "MD": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2023-05-29",
      "adoptionDate": "2023-05-19",
      "notes": null
    },
    "MA": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2024-10-11",
      "adoptionDate": "2024-10-11",
      "notes": null
    },
    "MI": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2016-02-28",
      "adoptionDate": "2015-10-09",
      "notes": null
    },
    "MN": {
      "residentialCode": "2012 IECC with amendments",
      "effectiveDate": "2015-02-14",
      "adoptionDate": "2014-12-08",
      "notes": null
    },
    "MS": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "MO": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "MT": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "6/11/2022 (9/21/24 Mid-Cycle Amendments)",
      "adoptionDate": "2022-06-11",
      "notes": null
    },
    "NE": {
      "residentialCode": "2018 IECC",
      "effectiveDate": "2020-07-01",
      "adoptionDate": "2019-05-08",
      "notes": null
    },
    "NV": {
      "residentialCode": "2024 IECC with amendments",
      "effectiveDate": "2024-08-18",
      "adoptionDate": "2024-08-18",
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "NH": {
      "residentialCode": "2018 IECC",
      "effectiveDate": "2022-07-01",
      "adoptionDate": "2022-07-01",
      "notes": null
    },
    "NJ": {
      "residentialCode": "2021 IECC",
      "effectiveDate": "2023-03-06",
      "adoptionDate": "2022-09-06",
      "notes": null
    },
    "NM": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2024-01-30",
      "adoptionDate": "2024-01-17",
      "notes": null
    },
    "NY": {
      "residentialCode": "2024 IECC with amendments",
      "effectiveDate": "2025-12-31",
      "adoptionDate": "2025-07-25",
      "notes": null
    },
    "NC": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2019-01-01",
      "adoptionDate": "2018-07-01",
      "notes": null
    },
    "ND": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "OH": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2019-07-01",
      "adoptionDate": "2018-12-14",
      "notes": null
    },
    "OK": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2022-09-14",
      "adoptionDate": "2022-09-14",
      "notes": null
    },
    "OR": {
      "residentialCode": "2023 Oregon Residential Specialty Code",
      "effectiveDate": "2023-10-01",
      "adoptionDate": "2023-10-01",
      "notes": null
    },
    "PA": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2026-01-01",
      "adoptionDate": "2025-10-16",
      "notes": null
    },
    "RI": {
      "residentialCode": "2024 IECC",
      "effectiveDate": "2025-12-01",
      "adoptionDate": "2024-11-14",
      "notes": null
    },
    "SC": {
      "residentialCode": "2009 IECC",
      "effectiveDate": "2013-01-01",
      "adoptionDate": "2012-04-02",
      "notes": null
    },
    "SD": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    },
    "TN": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2020-07-16",
      "adoptionDate": "2020-04-21",
      "notes": null
    },
    "TX": {
      "residentialCode": "2015 IECC",
      "effectiveDate": "2016-09-01",
      "adoptionDate": "2015-06-14",
      "notes": null
    },
    "UT": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2024-07-01",
      "adoptionDate": "2024-03-21",
      "notes": null
    },
    "VT": {
      "residentialCode": "2018 IECC with amendments",
      "effectiveDate": "2024-07-01",
      "adoptionDate": "2023-06-21",
      "notes": null
    },
    "VA": {
      "residentialCode": "2021 IECC with amendments",
      "effectiveDate": "2024-01-18",
      "adoptionDate": "2023-12-18",
      "notes": null
    },
    "WA": {
      "residentialCode": "2021 Washington State Energy Code",
      "effectiveDate": "2024-03-15",
      "adoptionDate": "2022-11-04",
      "notes": null
    },
    "WV": {
      "residentialCode": "2015 IECC with amendments",
      "effectiveDate": "2022-08-01",
      "adoptionDate": "2022-05-05",
      "notes": null
    },
    "WI": {
      "residentialCode": "2009 IECC with amendments",
      "effectiveDate": "2016-01-01",
      "adoptionDate": "2015-12-01",
      "notes": null
    },
    "WY": {
      "residentialCode": "Home rule",
      "effectiveDate": null,
      "adoptionDate": null,
      "notes": "For states designated as Home Rule, code level was determined using a weighted EUI (Energy Use Index) based on the applicable code for jurisdictions representing either (1) 80% of state population, or (2) 80% of recent building permit activity — U.S. Dept. of Energy, Building Energy Codes Program."
    }
  }
}