---
type: "Bill"
title: "Allow for duplex, triplex, and fourplex housing in city zoning"
description: "Allow for duplex, triplex, and fourplex housing in city zoning"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2023"
identifier: "SB 323"
citation: "Montana SB 323 (2023)"
classification: ["bill"]
subjects: ["Cities and Towns (see also: Local Government)", "Housing", "Local Government (see also: City Subjects; County Subjects)", "Planning and Development"]
status: "enacted"
primary_sponsors: ["Jeremy Trebas"]
version_count: 11
action_count: 50
vote_count: 8
first_action: "2022-12-01T20:56:56+00:00"
last_action: "2023-05-04T18:47:14+00:00"
source: "openstates"
source_identifier: "ocd-bill/b317f463-121f-4d1a-9d74-41643346ce00"
source_url: "https://bills.legmt.gov/#/bill/20231/LC2022"
source_hash: "00f5cfd6347c84cf60229b4999f8a759e9c2eb525eb48cc472d107a7cf809435"
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-mt"]
---

# Montana SB 323 (2023) — Allow for duplex, triplex, and fourplex housing in city zoning

## Version chain

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

1. **SB0323.001.001_Amendments-in-Context_final-condensed.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7353)
2. **SB0323.001.001_Amendments-in-Context_final-full.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7357)
3. **SB0323.002.001_Amendments-in-Context_final-condensed.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7355)
4. **SB0323.002.001_Amendments-in-Context_final-full (1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7356)
5. **SB0323.002.001_Amendments-in-Context_final-full.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7354)
6. **SB0323001SCS17700.slc.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7333)
7. **SB0323002SCS19646.slc.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7332)
8. **SB0323_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7310)
9. **SB0323_2.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7307)
10. **SB0323_3.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7309)
11. **SB0323_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=7308)

## Votes

- (S) Committee Executive Action--Bill Passed as Amended — **8–1** (pass) · upper
- (H) Committee Executive Action--Bill Concurred as Amended — **13–3** (pass) · lower
- (H) 3rd Reading Concurred — **72–26** (pass) · lower
- (S) 2nd Reading House Amendments Concurred — **27–23** (pass) · upper
- (S) 3rd Reading Passed as Amended by House — **35–14** (pass) · upper
- (S) 3rd Reading Passed — **47–3** (pass) · upper
- (H) 2nd Reading Concurred — **76–24** (pass) · lower
- (S) 2nd Reading Passed — **42–8** (pass) · upper

## Sponsors

- Jeremy Trebas — primary (person)

## Timeline

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

- **2023-05-04T18:47:14+00:00** Chapter Number Assigned `became-law`
- **2023-05-04T16:16:00+00:00** (S) Signed by Governor `executive-signature`
- **2023-05-01T16:50:00+00:00** (S) Transmitted to Governor `executive-receipt`
- **2023-04-29T19:00:00+00:00** (H) Signed by Speaker `passage`
- **2023-04-27T15:00:00+00:00** (S) Signed by President `passage`
- **2023-04-24T19:32:20+00:00** (C) Printed - Enrolled Version Available `enrolled`
- **2023-04-24T19:32:19+00:00** (S) Returned from Enrolling
- **2023-04-20T13:06:56+00:00** (S) Sent to Enrolling
- **2023-04-19T21:40:00+00:00** (S) 3rd Reading Passed as Amended by House `passage, passage, reading-3, reading-3`
- **2023-04-19T19:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2023-04-19T00:44:00+00:00** (S) 2nd Reading House Amendments Concurred `amendment-amendment, amendment-passage, reading-2, reading-2`
- **2023-04-18T20:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2023-04-14T19:37:58+00:00** (H) Returned to Senate with Amendments
- **2023-04-13T22:12:00+00:00** (H) 3rd Reading Concurred `passage, reading-3`
- **2023-04-13T19:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2023-04-12T14:22:00+00:00** (H) 2nd Reading Concurred `reading-2, reading-2`
- **2023-04-12T14:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2023-04-05T20:33:10+00:00** (C) Printed - New Version Available
- **2023-04-05T19:23:00+00:00** (H) Committee Report--Bill Concurred as Amended
- **2023-04-04T21:00:00+00:00** (H) Committee Executive Action--Bill Concurred as Amended
- **2023-03-28T21:00:00+00:00** (H) Hearing
- **2023-03-15T21:45:11+00:00** (H) First Reading `reading-1`
- **2023-03-15T20:56:57+00:00** (H) Referred to Committee `referral-committee`
- **2023-03-03T18:17:39+00:00** (S) Transmitted to House
- **2023-03-02T15:45:00+00:00** (S) 3rd Reading Passed `passage, reading-3`
- **2023-03-02T15:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2023-03-01T22:00:00+00:00** (S) 2nd Reading Passed `reading-2, reading-2`
- **2023-03-01T17:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2023-02-27T22:56:29+00:00** (C) Printed - New Version Available
- **2023-02-24T20:57:00+00:00** (S) Committee Report--Bill Passed as Amended `committee-passage`
- **2023-02-23T19:00:00+00:00** (S) Committee Executive Action--Bill Passed as Amended `committee-passage`
- **2023-02-23T15:30:55+00:00** (C) Amendments Available
- **2023-02-20T22:00:25+00:00** (S) Hearing
- **2023-02-13T20:25:39+00:00** (S) First Reading `reading-1`
- **2023-02-13T18:19:56+00:00** (S) Referred to Committee `referral-committee`
- **2023-02-12T20:38:52+00:00** (C) Introduced Bill Text Available Electronically
- **2023-02-10T23:20:29+00:00** (S) Introduced
- **2023-02-09T18:03:13+00:00** (C) Draft Ready for Delivery
- **2023-02-09T14:39:52+00:00** (C) Executive Director Final Review
- **2023-02-09T14:39:48+00:00** (C) Draft Ready for Delivery
- **2023-02-09T12:55:49+00:00** (C) Draft in Assembly
- **2023-02-09T01:16:23+00:00** (C) Executive Director Review
- **2023-02-08T23:32:53+00:00** (C) Bill Draft Text Available Electronically
- **2023-02-08T23:32:52+00:00** (C) Draft in Final Drafter Review
- **2023-02-08T23:14:05+00:00** (C) Draft in Input/Proofing
- **2023-02-08T21:27:01+00:00** (C) Draft to Drafter - Edit Review
- **2023-02-05T16:43:22+00:00** (C) Draft in Edit
- **2023-02-04T23:06:58+00:00** (C) Draft in Legal Review
- **2023-01-24T23:19:42+00:00** (C) Draft to Requester for Review
- **2022-12-01T20:56:56+00:00** (C) Draft Request Received `receipt`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/b317f463-121f-4d1a-9d74-41643346ce00`. Confidence: reported (aggregated from official Montana legislature records).