You own your house and live in it. Can you share one or two spare rooms with people who are not family, for a month or longer? This page answers that question for California, from its state laws and a sample of its cities and counties. We call it a typical home share.
Californiaat a glance
Should you worryabout zoning?
Answer four quick questions. We will show you what the rules we found say for a home like yours, and what to ask your city or county. It works for homeowners and for the family members helping them.
Cities and countiesin California
Details for each location
This page is here to help you learn and to give you context. It does not interpret any zoning code and is not legal advice. Rules vary and change, and only your city or county planning office can say what applies to your home.
What the law asksof a home share
Where a state's landlord and tenant law covers home sharing, it gives you and your home sharer a few ground rules. Knowing them up front makes for a better agreement and fewer surprises.
Sharing, boarding, renting, rooming:what the words mean
The laws and codes rarely say "home sharing." They use older words, and each city or county can define them differently. Here is what each word means in everyday terms, and how California and the locations in our sample use it.
For the national picture, the history of these rules, and more resources, see The Rules Behind the Spare Room.
This page is here to help you learn and to give you context. It does not interpret any zoning code and is not legal advice. Rules vary and change, and only your city or county planning office can say what applies to your home.
Citations, Definitions & SourcesOpen the fine printClose the fine printEvery rule on this page is quoted from a law, a code, or a court opinion, with the date we checked it. The sources for California are available by clicking Open the Fine Print.
Definitions
A typical home share. You own your house and live in it, and you share one or two spare rooms with people who are not family, for a month or longer.
The six answers. Yes: the rules we found allow a typical home share with no extra step. Yes, with limits: they allow it but set a limit, such as a number of people or rooms. Yes, after a permit or sign-up: they allow it once a step is done. Not clear: the rules do not answer it either way, or we could not read them. No county zoning found: the county and state sources we read show no county zoning code, though none says so in words. No: the rules do not allow it.
State policy and zoning toward home sharing. The map groups states by what their laws and plans do for home sharing today. A state is Leading when two things are true. First, its law stops cities and counties from limiting who lives together based on family ties, in all cases or in some. Second, the state has committed to home sharing: it names home sharing in its State Plan on Aging, an aging strategy, or an affordable housing plan, funds an ongoing home sharing program, or has a law that allows such funding. A one-time pilot is a welcome first step, but it does not count as a statewide commitment. A state is Supportive when one of the two is true, Open when neither is but its landlord and tenant law clearly covers home sharing, and Getting started when none of these is true yet. A state is marked as an opportunity, in a lighter shade on the map, when it has committed to home sharing but its laws do not yet protect home sharing statewide or do not yet say clearly which ground rules apply. Every check traces to a cited source on the state's page. The groups describe state law and policy, not how welcoming any community is, and not what any particular home may do.
Single housekeeping unit. Many zoning codes say a family or household must live as a "single housekeeping unit." The phrase describes people who live together as one household, sharing the home, rather than as separate tenants under one roof. Most codes use it without saying more, and each city or county decides what it means. The codes in our sample that spell it out point to the same kinds of things: sharing the kitchen and living areas, sharing chores and expenses, and, as signs of separate households, locks on bedroom doors or separate leases. Where a city or county on this page defines the phrase, its entry quotes the definition under Read the code. If your city or county's code uses the phrase, ask the planning office how it applies to a home share, such as one where the person sharing your home pays rent and has their own room.
Checked. The date we last read the source itself. Codes change. Your planning office has the current version.
Sources for California
| Source | Where it is used |
|---|---|
| Cal. Civ. Code 1946.5 [Stats. 1986, ch. 1010, s.1] (official California Legislative Information site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1940 [Stats. 1996, ch. 1023] (2025 California Code; Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1946.2 [Stats. 2025, ch. 203 (AB 1529)] (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| City of Santa Barbara v. Adamson, 27 Cal.3d 123 (1980) (SCOCAL, Stanford Law School) | California. Checked 2026-10-08. Open the source. |
| Village of Belle Terre v. Boraas, 416 U.S. 1 (1974) | California. Checked 2026-10-08. Open the source. |
| Moore v. City of East Cleveland, 431 U.S. 494 (1977) | California. Checked 2026-10-08. Open the source. |
| Cal. Gov. Code 66315 (public.law reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Gov. Code 66333 (public.law reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Gov. Code 65852.21 (public.law reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1946.1 [Stats. 2024, ch. 1015 (SB 1103)] (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1950.5 [Stats. 2025, ch. 340 (AB 414)] (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1947.12 [Stats. 2023, ch. 290 (SB 567)] (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1941.1 (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 1941.2 (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Civ. Code 789.3 (Justia reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| Cal. Gov. Code 12927 (public.law reproduction; confirm on the official site) | California. Checked 2026-10-08. Open the source. |
| 42 U.S.C. 3603(b)(2) | California. Checked 2026-10-08. Open the source. |
| 42 U.S.C. 1982 | California. Checked 2026-10-08. Open the source. |
| Jones v. Alfred H. Mayer Co., 392 U.S. 409 (1968): section 1982 "contains none of the exemptions" in the Fair Housing Act | California. Checked 2026-10-08. Open the source. |
| Fair Housing Council v. Roommate.com, LLC, 666 F.3d 1216 (9th Cir. 2012): "we interpret the FHA and FEHA as not applying to the sharing of living units" | California. Checked 2026-10-08. Open the source. |
| CDA OAA State Plan on Aging page | California. Checked 2026-10-08. Open the source. |
| California OAA State Plan on Aging 2025-2029 | California. Checked 2026-10-08. Open the source. |
| CHHS Master Plan for Aging Progress Report, Spring 2020, p. 5 | California. Checked 2026-10-08. Open the source. |
| HCD Consolidated Plans page | California. Checked 2026-10-08. Open the source. |
| State of California 2025-2029 Federal Consolidated Plan | California. Checked 2026-10-08. Open the source. |
| Assemblymember Ward release on AB 474 | California. Checked 2026-10-08. Open the source. |
| CA.aging_strategy (full text searched) | California. Checked 2026-10-08. Open the source. |
| LAMC 12.03, Definitions (Family, Dwelling Unit, Boarding or Rooming House, Guest Room, Home-Sharing, Hotel) | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 12.08, "R1" One-Family Zone | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 12.10, "R3" Multiple Dwelling Zone | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 12.22 A.32, Home-Sharing (Short-Term Rental definition at (b)(11)) | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 165.04, Applicability (Just Cause for Eviction Ordinance) | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 165.10, Just Cause Enforcement Fee | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 151.02, Definitions (Rent Stabilization Ordinance) | Los Angeles, California. Checked 2026-10-08. Open the source. |
| LAMC 161.301, Scope (Housing Code) | Los Angeles, California. Checked 2026-10-08. Open the source. |
| SCC 17.108.040 to 17.108.090 (C to H definitions: Dormitory, Dwelling, Dwelling unit; no Family or Household entry) | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC 17.108.170 to 17.108.200 (P to S definitions: Residential hotel; no rooming house entry) | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC 17.108.020 and 17.108.030 (A and B definitions: Bed and breakfast inn; no boarding house entry) | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC 17.204.210, R-1 zone-Permitted uses | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC 17.228.104, Bed and breakfast inn in residential zones (short-term rental at D) | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC 5.114.010, Short-term rentals, Definitions | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC chapter 8.120, Rental Housing Inspections Code (8.120.030 to 8.120.060) (8.120.030 at this node; 8.120.060 at 0-0-0-19718) | Sacramento, California. Checked 2026-10-08. Open the source. |
| SCC chapter 5.76, Hotels, Rooming Houses and Similar Establishments | Sacramento, California. Checked 2026-10-08. Open the source. |
| MCC 17.148.010, Definitions (Family, Household, Dwelling unit, Boardinghouse, Residential use, Vacation rental) | Mariposa County, California. Checked 2026-10-08. Open the source. |
| MCC 17.16.010, Rural Residential Zone (RRZ) | Mariposa County, California. Checked 2026-10-08. Open the source. |
| MCC 17.108.180, Bed and Breakfast and Residential Transient Rentals | Mariposa County, California. Checked 2026-10-08. Open the source. |
| 2022 California Building Code (Cal. Code Regs. Title 24, Part 2), Chapter 2, "Boarding house" and "Lodging house" | Mariposa County, California. Checked 2026-10-08. Open the source. |
Cite This Paper
HomeShare Oregon. (2026). The Rules Behind the Spare Room: California. https://homeshareoregon.org/research/rules-behind-the-spare-room/california/
About HomeShare Oregon
HomeShare Oregon publishes this paper as students of aging, housing, and community infrastructure. We operate one of many possible interventions in the missing middle. We believe the most useful contribution we can make to the larger field is to add a frame and a research agenda, rather than to argue for our particular role within it.
If you are working on related questions, we would like to hear from you. Email the executive director at executivedirector@homeshareoregon.org.