---
type: "Bill"
title: "ACCESSORY DWELLING UNITS – Adds to existing law to prohibit certain kinds of restrictions on internal accessory dwelling units."
description: "ACCESSORY DWELLING UNITS – Adds to existing law to prohibit certain kinds of restrictions on internal accessory dwelling units."
jurisdiction: "us/states/id"
legislature: "Idaho Legislature"
session: "2023"
identifier: "H 166"
citation: "Idaho H 166 (2023)"
classification: ["bill"]
subjects: ["ASSOCIATIONS", "HOMES AND HOUSING", "HOMES AND HOUSING", "LAND USE", "PLANNING AND ZONING", "REAL PROPERTY", "REAL PROPERTY"]
status: "enacted"
primary_sponsors: []
version_count: 3
action_count: 27
vote_count: 3
first_action: "2023-02-20"
last_action: "2023-04-06"
source: "openstates"
source_identifier: "ocd-bill/812c30cd-3130-486a-b793-9fc0e46c19a3"
source_url: "https://legislature.idaho.gov/sessioninfo/2023/legislation/H0166/"
source_hash: "25f86f4501732f987bd3f86f6544af8cd2c51e6774d1327cbdb9f1ad45d0a04e"
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-id"]
---

# Idaho H 166 (2023) — ACCESSORY DWELLING UNITS – Adds to existing law to prohibit certain kinds of restrictions on internal accessory dwelling units.

## Version chain

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

1. **Amendment** (committee substitute) — [source](https://legislature.idaho.gov/wp-content/uploads/sessioninfo/2023/legislation/H0166A2.pdf)
2. **Bill Text** (committee substitute) — [source](https://legislature.idaho.gov/wp-content/uploads/sessioninfo/2023/legislation/H0166.pdf)
3. **Engrossment 1** (committee substitute) — [source](https://legislature.idaho.gov/wp-content/uploads/sessioninfo/2023/legislation/H0166E1.pdf)

## Votes

- Rules Suspended: Ayes 66 Nays 0 Abs/Excd 4, read in full as required – — **56–13** (pass) · lower
- Rules Suspended: Ayes 64 Nays 0 Abs/Excd 6, read in full as required – — **50–17** (pass) · lower
- Read third time as amended in the Senate – — **32–3** (pass) · upper

## Sponsors

- STATE AFFAIRS COMMITTEE — primary (organization)

## Timeline

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

- **2023-02-20** Introduced, read first time, referred to JRA for Printing `introduction`
- **2023-02-21** Reported Printed and Referred to Business
- **2023-03-02** Reported out of Committee with Do Pass Recommendation, Filed for Second Reading `committee-passage-favorable`
- **2023-03-03** Read second time; Filed for Third Reading `reading-2`
- **2023-03-03** Rules Suspended: Ayes 64 Nays 0 Abs/Excd 6, read in full as required – PASSED - 50-17-3AYES – Alfieri, Andrus, Barbieri, Berch, Blanksma, Boyle, Bundy, Burns, Cannon, Chew, Crane(12), Crane(13), Dixon(24), Durrant, Ehardt, Ehlers, Erickson, Galaviz, Gallagher, Garner, Green, Handy, Hawkins, Hill, Holtzclaw, Kingsley(Crawford), Lambert, Mathias, McCann, Mendive, Miller, Mitchell, Monks, Nash, Necochea, Petzke, Pickett, Price, Roberts, Rubel, Sauter, Scott, Shepherd, Tanner, Vander Woude, Wheeler, Wisniewski, Wroten, Young, Mr. SpeakerNAYS – Allgood, Cheatum, Cornilles, Dixon(1), Furniss, Gannon, Healey, Horman, Lanting, Manwaring, Mickelsen, Nelsen, Raybould, Raymond, Skaug, Weber, YamamotoAbsent – Clow, Palmer, RedmanFloor Sponsor - NashTitle apvd - to Senate
- **2023-03-06** Received from the House passed; filed for first reading
- **2023-03-06** Introduced, read first time; referred to: Commerce & Human Resources `introduction`
- **2023-03-22** Reported out of committee; to 14th Order for amendment
- **2023-03-27** Placed in the Committee of the Whole
- **2023-03-27** Amendments ordered printed
- **2023-03-27** Reported out as amended; filed for first reading
- **2023-03-27** Amendments reported printed
- **2023-03-27** Read first time as amended in the Senate; Filed for Second Reading
- **2023-03-28** Read second time as amended in the Senate, filed for Third Reading `reading-2`
- **2023-03-29** Read third time as amended in the Senate – PASSED - 32-3-0AYES – Adams, Anthon, Bjerke, Carlson, Cook, Den Hartog, Foreman, Geddes(Harris), Grow, Hart, Hartgen, Herndon, Just, Lakey, Lee, Lenney, Lent, Nichols, Okuniewicz, Rabe, Ricks, Ruchti, Schroeder, Semmelroth, Taylor, Toews, Trakel, VanOrden, Ward-Engelking, Winder, Wintrow, ZuiderveldNAYS – Bernt, Burtenshaw, GuthrieAbsent and excused – NoneFloor Sponsor - RuchtiTitle apvd - to House
- **2023-03-29** Returned from the Senate Amended; Held at Desk
- **2023-03-29** House Concurred in Senate Amendments
- **2023-03-29** Bills as Amended Referred to JRA for Engrossing
- **2023-03-30** Reported Engrossed; Filed for First Reading of Engrossed Bills
- **2023-03-30** Read first time as amended in Senate; Filed for Second Reading
- **2023-03-30** Rules Suspended: Ayes 66 Nays 0 Abs/Excd 4, read in full as required – PASSED - 56-13-1AYES – Alfieri, Allgood, Andrus, Barbieri, Berch, Blanksma, Boyle, Bundy, Burns, Cannon, Chew, Clow, Cornilles, Crane(12), Dixon(1), Dixon(24), Durrant, Ehlers, Erickson, Galaviz, Gallagher, Gannon, Garner, Green, Handy, Healey, Hill, Holtzclaw, Lanting, Mathias, McCann, Mendive, Mickelsen, Miller, Mitchell, Monks, Nash, Necochea, Nelsen, Palmer, Petzke, Pickett, Raybould, Redman, Roberts, Rubel, Sauter, Shepherd, Vander Woude, Weber, Wheeler, Wisniewski, Wroten, Yamamoto, Young(Cannon), Mr. SpeakerNAYS – Cheatum, Ehardt, Furniss, Hawkins, Horman, Kingsley, Lambert, Manwaring, Price, Raymond, Scott, Skaug, TannerAbsent – Crane(13)Floor Sponsor - NashTitle apvd - to enrol
- **2023-03-30** Reported Enrolled; Signed by Speaker; Transmitted to Senate `passage`
- **2023-03-31** Received from the House enrolled/signed by Speaker
- **2023-03-31** Signed by President; returned to House `passage`
- **2023-03-31** Returned Signed by the President; Ordered Transmitted to Governor `executive-receipt`
- **2023-03-31** Delivered to Governor at 9:40 a.m. on March 31, 2023 `executive-receipt`
- **2023-04-06** Reported Signed by Governor on April 3, 2023 Session Law Chapter 265 Effective: 04/03/2023 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/812c30cd-3130-486a-b793-9fc0e46c19a3`. Confidence: reported (aggregated from official Idaho legislature records).