---
type: "Bill"
title: "Housing: junior accessory dwelling units."
description: "The Planning and Zoning Law authorizes a local agency to provide by ordinance for the creation of 2nd units in single-family and multifamily residential areas, as prescribed."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20152016"
identifier: "AB 2406"
citation: "California AB 2406 (20152016)"
classification: ["bill"]
subjects: ["Housing: junior accessory dwelling units."]
status: "enacted"
primary_sponsors: ["Thurmond"]
version_count: 9
action_count: 29
vote_count: 6
first_action: "2016-02-19"
last_action: "2016-09-28"
source: "openstates"
source_identifier: "ocd-bill/309cc934-09d1-486c-8834-31436a39e4e2"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=201520160AB2406"
source_hash: "560e932aee915adeaedea8bf6cc1359f31f8379431de8e014991b68d83e08497"
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-ca"]
---

# California AB 2406 (20152016) — Housing: junior accessory dwelling units.

The Planning and Zoning Law authorizes a local agency to provide by ordinance for the creation of 2nd units in single-family and multifamily residential areas, as prescribed.

## Version chain

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

1. **02/19/16 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240699INT)
2. **04/18/16 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240698AMD)
3. **04/28/16 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240697AMD)
4. **06/08/16 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240696AMD)
5. **08/09/16 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240695AMD)
6. **08/19/16 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240694AMD)
7. **09/28/16 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240692CHP)
8. **AB2406** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=201520160AB2406)
9. **08/30/16 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=201520160AB2406&version=20150AB240693ENR)

## Votes

- AB 2406 THURMOND Concurrence - Urgency Added — **77–0** (pass) · lower
- 3rd Reading AB2406 Thurmond By McGuire Urgency Clause — **39–0** (pass) · upper
- Do pass as amended and be re-referred to the Committee on [Local Government] — **7–0** (pass) · lower
- Do pass — **11–0** (pass) · upper
- Do pass. — **6–0** (pass) · lower
- AB 2406 THURMOND Assembly Third Reading — **76–0** (pass) · lower

## Sponsors

- Thurmond — primary (person)
- Levine — coauthor (person)

## Timeline

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

- **2016-02-19** Introduced. To print. `introduction`
- **2016-02-21** From printer. May be heard in committee March 22.
- **2016-02-22** Read first time. `reading-1`
- **2016-03-08** Referred to Coms. on H. & C.D. and L. GOV. `referral-committee`
- **2016-04-18** From committee chair, with author's amendments: Amend, and re-refer to Com. on H. & C.D. Read second time and amended. `reading-2, amendment-introduction, amendment-passage, reading-1`
- **2016-04-19** Re-referred to Com. on H. & C.D. `referral-committee`
- **2016-04-21** Assembly Rule 56 suspended. (Page 4448.)
- **2016-04-21** (pending re-refer to Com. on L. GOV.)
- **2016-04-27** From committee: Amend, and do pass as amended and re-refer to Com. on L. GOV. (Ayes 7. Noes 0.) (April 27). `amendment-introduction, committee-passage, amendment-passage`
- **2016-04-28** Read second time and amended. `amendment-passage, reading-2, reading-1`
- **2016-05-02** Re-referred to Com. on L. GOV. `referral-committee`
- **2016-05-05** From committee: Do pass. (Ayes 7. Noes 0.) (May 4). `committee-passage-favorable, committee-passage`
- **2016-05-09** Read second time. Ordered to third reading. `reading-2, reading-1`
- **2016-05-12** Read third time. Passed. Ordered to the Senate. (Ayes 76. Noes 0. Page 4778.) `reading-3, passage, reading-1`
- **2016-05-12** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2016-05-19** Referred to Com. on T. & H. `referral-committee`
- **2016-06-08** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on T. & H. `referral-committee, reading-2, amendment-introduction, amendment-passage, reading-1`
- **2016-06-15** From committee: Do pass. (Ayes 11. Noes 0.) (June 14). `committee-passage-favorable, committee-passage`
- **2016-06-16** Read second time. Ordered to third reading. `reading-2, reading-1`
- **2016-08-09** Read third time and amended. Ordered to second reading. `reading-3, amendment-passage, reading-1`
- **2016-08-10** Read second time. Ordered to third reading. `reading-2, reading-1`
- **2016-08-19** Read third time and amended. Ordered to second reading. `reading-3, amendment-passage, reading-1`
- **2016-08-22** Read second time. Ordered to third reading. `reading-2, reading-1`
- **2016-08-23** Read third time. Urgency clause adopted. Passed. Ordered to the Assembly. (Ayes 39. Noes 0. Page 5285.). `reading-3, passage, reading-1`
- **2016-08-24** In Assembly. Concurrence in Senate amendments pending. May be considered on or after August 26 pursuant to Assembly Rule 77.
- **2016-08-29** Urgency clause adopted. Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 77. Noes 0. Page 6380.). `committee-passage-favorable, amendment-passage`
- **2016-09-07** Enrolled and presented to the Governor at 12 p.m.
- **2016-09-28** Approved by the Governor. `executive-signature`
- **2016-09-28** Chaptered by Secretary of State - Chapter 755, Statutes of 2016.

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/309cc934-09d1-486c-8834-31436a39e4e2`. Confidence: reported (aggregated from official California legislature records).