Tennessee

Current Energy Code Status

	Residential	Commercial
Current State Code	2018 IECC	2021 IECC and ASHRAE 90.1-2019
State Amendments	Yes	Yes
Equivalent Code*	2009 IECC	90.1-2016
Amendments Efficiency Impact (Compared to Model Adopted Code)	-19.80%	-1.80%
Effective Date	07/16/2020	04/17/2025
Enforcement	Mandatory Statewide	Mandatory Statewide
Can use COMcheck / Rescheck	Yes	Yes

*Equivalent Code is based on a quantitative analysis of the state code with amendments as displayed in the Residential and Commercial Status of State Energy Code Maps.

State Certifications

Federal law directs states to review and update their building energy codes regarding energy efficiency and submit related certifications. The following is the most recent certification submitted by the state.

States are required by statute to submit certifications within 2 years of the publication of an affirmative determination of a new model energy code. Learn more about the statutory requirements.

Most Recent Submitted Certification

• Residential: None
• Commercial: None

Model Energy Code Impacts

Key metrics related to incremental construction costs and consumer energy cost savings.

Energy and Economic Impacts

Model Energy Code	Measure	Energy Cost Savings
Residential Statewide Impact  Potential (2024 IECC)	Incremental First Cost of 2024 IECC ($/home)	$ 11,289
	Annual Energy Cost Savings ($/home)	$ 785
	Annual Energy Savings (kBtu/home)	26,616
	30 year Life Cycle Cost (LCC) Savings ($/home)	$ 4,941
	Simple Payback Period (years)	14.4
	Housing Starts (15 year average)**	22,571
	Statewide Total Incremental Cost Impact ($)	$ 254,804,019
	Statewide First Year Energy Cost Savings  ($)	$ 17,718,235

** Based on 2020 U.S Census, American Housing Survey 15 year average housing starts

Contacts