# Pennsylvania — Which energy code each US state enforces for new homes: the IECC edition (or state equivalent) actually in force, with effective dates and amendments, from the state rules themselves

For Pennsylvania, energy code in force is International Energy Conservation Code of 2021; adopting authority is Pennsylvania Department of Labor and Industry; statute / rule citation is 34 Pa. Code 403.21, verified against its source on 2026-08-18.

- **State:** Pennsylvania _(verified: appears in the quote below)_
- **Energy code in force:** International Energy Conservation Code of 2021 _(verified: appears in the quote below)_
- **Adopting authority:** Pennsylvania Department of Labor and Industry _(verified: appears in the quote below)_
- **Statute / rule citation:** 34 Pa. Code 403.21 _(verified: appears in the quote below)_

## What the source says

> ‘‘Pennsylvania’s Alternative Residential Energy Provisions.’’ (2) The prescriptive methods for all other buildings or structures contained in the ‘‘International Energy Conservation Code of 2021’’

## Source

- https://www.pacodeandbulletin.gov/Display/pacode?file=/secure/pacode/data/034/chapter403/s403.21.html

Last verified: 2026-08-18. Review by: 2027-02-14.
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