HB 939 Missouri House · 2025 Regular Session

Changes provisions governing the adoption of certain building codes or standards

HB 939 modifies Missouri's process for communities (counties, cities, fire districts) to adopt building codes by allowing them to reference existing codes instead of copying full text, while requiring public filing of adopted codes. It directly affects homeowners, builders, and developers of one- or two-family homes, condos, and townhouses by prohibiting local ordinances that mandate "green" or "excessive" building standards beyond the 2009 International Residential Code (IRC) or 2009 International Energy Conservation Code (IECC). Key provisions ban requirements for sustainable, energy-efficient, or environmentally responsive features that threaten housing affordability. Violating ordinances are declared null and void, and all adopted codes must clearly state penalties for violations.

Issues: ✗ Energy ✗ Environment

Bill status passed 3 of 5 stages cleared

Introduction

Jan 2025

Committee Review

Apr 2025

House Passage

Mar 2025

Senate Passage

Governor

Introduced Jan 16, 2025 Last action Apr 29, 2025

Maddy AI version diff · 1 comparison

What changed between versions

Introduced → Perfected · 4 edits

MODERATE

The bill was amended to expand its scope and clarify language regarding building design restrictions. The changes removed the word 'excessive' from the description of prohibited building practices and added new building types (multiunit apartment buildings and commercial/industrial buildings) to the list of properties covered by the affordability protection provisions.

Scope change

The bill's scope was expanded to include multiunit apartment buildings and commercial or industrial buildings in addition to residential properties, and the language was modified to remove the subjective term 'excessive' from the description of prohibited green building practices.

SCOPE

Removed the word 'excessive' from the description of green building design and construction practices to make the prohibition less subjective.

Added multiunit apartment buildings to the list of property types protected from mandatory green building requirements.

Added commercial or industrial buildings to the list of property types protected from mandatory green building requirements.

REQUIREMENT

Modified the list of prohibited standards to clarify that energy standards exceeding the 2009 International Residential Code are included in the restrictions.

Floor votes

How they voted

This bill passed the House by voice vote (no roll call recorded).

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Apr 17, 2025

Upper · Passed

Reported Do Pass (S)

upper

Apr 7, 2025

Upper · Passed

Voted Do Pass (S)

upper

Mar 13, 2025

Committee

Second read and referred: Local Government, Elections and Pensions(S)

upper

Mar 5, 2025

Lower · Passed

Third Read and Passed (H) - AYES: 104 NOES: 47 PRESENT: 5

lower

Mar 3, 2025

Lower · Passed

Perfected with Amendments (H) - HA 1, adopted.

lower

Feb 20, 2025

Lower · Passed

Reported Do Pass (H) - AYES: 7 NOES: 2 PRESENT: 1

lower

Feb 20, 2025

Lower · Passed

Voted Do Pass (H)

lower

Feb 6, 2025

Committee

Referred: Rules - Legislative(H)

lower

Feb 5, 2025

Lower · Passed

Reported Do Pass (H) - AYES: 6 NOES: 3 PRESENT: 0

lower

Feb 5, 2025

Lower · Passed

Voted Do Pass (H)

lower

Jan 22, 2025

Committee

Referred: Commerce(H)

lower

Jan 16, 2025

Introduced

Introduced and Read First Time (H)

lower

1 primary · 2 co-sponsors