---
type: "Bill"
title: "RES BUILD CODE RADON"
description: "Amends the Illinois Residential Building Code Act. Provides that a contract to build a home must contain, in addition to the adoption of a referenced building code, a provision requiring that a radon mitigation system be included in the construction. Effective immediately."
jurisdiction: "us/states/il"
legislature: "Illinois General Assembly"
session: "97th"
identifier: "HB 4665"
citation: "Illinois HB 4665 (97th)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: []
version_count: 3
action_count: 49
vote_count: 2
first_action: "2012-02-01"
last_action: "2012-08-13"
source: "openstates"
source_identifier: "ocd-bill/703fd3c1-828b-4821-8102-c909565bbf45"
source_url: "http://ilga.gov/legislation/BillStatus.asp?DocNum=4665&GAID=11&DocTypeID=HB&LegId=64454&SessionID=84&GA=97"
source_hash: "2e64e8d287283f065655fae15dbc7028d69a2d759764c4345c18808ea52125c0"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-il"]
---

# Illinois HB 4665 (97th) — RES BUILD CODE RADON

Amends the Illinois Residential Building Code Act. Provides that a contract to build a home must contain, in addition to the adoption of a referenced building code, a provision requiring that a radon mitigation system be included in the construction. Effective immediately.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Introduced** (filed) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09700HB4665&GA=97&SessionId=84&DocTypeId=HB&LegID=64454&DocNum=4665&GAID=11&Session=&print=true)
2. **Engrossed** (committee substitute) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09700HB4665eng&GA=97&SessionId=84&DocTypeId=HB&LegID=64454&DocNum=4665&GAID=11&Session=&print=true)
3. **Enrolled** (enrolled) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09700HB4665enr&GA=97&SessionId=84&DocTypeId=HB&LegID=64454&DocNum=4665&GAID=11&Session=&print=true)

## Votes

- Third Reading — **96–12** (pass) · lower
- Third Reading — **53–1** (pass) · upper

## Sponsors

- Emily McAsey — primary (person)
- Kimberly A. Lightford — cosponsor (person)
- Mattie Hunter — cosponsor (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2012-02-01** Filed with the Clerk by Rep. Emily McAsey `filing`
- **2012-02-03** First Reading `reading-1`
- **2012-02-03** Referred to Rules Committee `referral-committee`
- **2012-02-07** Assigned to Judiciary I - Civil Law Committee `referral-committee`
- **2012-02-21** Added Chief Co-Sponsor Rep. Karen May
- **2012-02-29** Added Chief Co-Sponsor Rep. Michael J. Zalewski
- **2012-03-02** House Committee Amendment No. 1 Filed with Clerk by Rep. Emily McAsey `amendment-introduction`
- **2012-03-02** House Committee Amendment No. 1 Referred to Rules Committee `referral-committee`
- **2012-03-05** House Committee Amendment No. 1 Rules Refers to Judiciary I - Civil Law Committee
- **2012-03-07** House Committee Amendment No. 1 Adopted in Judiciary I - Civil Law Committee; by Voice Vote `amendment-passage`
- **2012-03-07** Do Pass as Amended / Short Debate Judiciary I - Civil Law Committee; 010-000-000 `committee-passage`
- **2012-03-07** Placed on Calendar 2nd Reading - Short Debate
- **2012-03-07** Added Chief Co-Sponsor Rep. Jerry F. Costello, II
- **2012-03-09** Added Co-Sponsor Rep. Elizabeth Hernandez
- **2012-03-23** Added Co-Sponsor Rep. Elaine Nekritz
- **2012-03-23** Added Co-Sponsor Rep. Charles W. Krezwick
- **2012-03-26** Added Co-Sponsor Rep. Naomi D. Jakobsson
- **2012-03-26** House Floor Amendment No. 2 Filed with Clerk by Rep. Emily McAsey `amendment-introduction`
- **2012-03-26** House Floor Amendment No. 2 Referred to Rules Committee `referral-committee`
- **2012-03-27** Second Reading - Short Debate `reading-2`
- **2012-03-27** Held on Calendar Order of Second Reading - Short Debate `reading-2`
- **2012-03-28** House Floor Amendment No. 2 Rules Refers to Judiciary I - Civil Law Committee
- **2012-03-29** House Floor Amendment No. 2 Recommends Be Adopted Judiciary I - Civil Law Committee; 011-000-000 `committee-passage-favorable`
- **2012-03-29** House Floor Amendment No. 2 Adopted by Voice Vote `amendment-passage`
- **2012-03-29** Placed on Calendar Order of 3rd Reading - Short Debate
- **2012-03-29** Added Co-Sponsor Rep. Patrick J. Verschoore
- **2012-03-29** Added Co-Sponsor Rep. Eddie Lee Jackson, Sr.
- **2012-03-29** Added Co-Sponsor Rep. Scott E. Penny
- **2012-03-29** Added Co-Sponsor Rep. Esther Golar
- **2012-03-29** Third Reading - Short Debate - Passed 096-012-000 `reading-3, passage`
- **2012-03-30** Arrive in Senate `introduction`
- **2012-03-30** Placed on Calendar Order of First Reading `reading-1`
- **2012-03-30** Chief Senate Sponsor Sen. Jacqueline Y. Collins
- **2012-03-30** First Reading `reading-1`
- **2012-03-30** Referred to Assignments `referral-committee`
- **2012-04-11** Assigned to Licensed Activities `referral-committee`
- **2012-04-18** Do Pass Licensed Activities; 010-001-000 `committee-passage`
- **2012-04-18** Placed on Calendar Order of 2nd Reading April 19, 2012
- **2012-04-18** Added as Alternate Chief Co-Sponsor Sen. Michael Noland
- **2012-04-20** Added as Alternate Co-Sponsor Sen. Kimberly A. Lightford
- **2012-04-30** Added as Alternate Co-Sponsor Sen. Mattie Hunter
- **2012-05-02** Second Reading `reading-2`
- **2012-05-02** Placed on Calendar Order of 3rd Reading May 3, 2012
- **2012-05-16** Third Reading - Passed; 053-001-000 `reading-3, passage`
- **2012-05-16** Passed Both Houses
- **2012-06-14** Sent to the Governor `executive-receipt`
- **2012-08-13** Governor Approved `executive-signature`
- **2012-08-13** Effective Date June 1, 2013; - Some Parts August 13, 2012
- **2012-08-13** Public Act . . . . . . . . . 97-0953 `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/703fd3c1-828b-4821-8102-c909565bbf45`. Confidence: reported (aggregated from official Illinois legislature records).