Here’s some good news for Altadena homeowners trying to rebuild after the Eaton Fire: things just got a little less chaotic. On October 1, 2026, Governor Gavin Newsom signed Senate Bill 1090 — the “Keep Altadena Land in Altadena Hands Act.” This new law blocks high-density housing development in Altadena for three years. Why does that matter to you? Because it touches homeowners rebuilding burned lots, families who inherited fire-damaged property, investors eyeing Altadena parcels, and anyone caught up in a real estate deal in the area right now. If you own land in Altadena, you need to know what SB 1090 allows, what it restricts, and how it might shift your rebuilding or selling timeline. Protect your rights — we handle the rest.
Background: What SB 1090 Does
The Eaton Fire wiped out thousands of homes in Altadena, an unincorporated community in Los Angeles County. As families started picking up the pieces, lawmakers got worried. State density laws built to add housing statewide could actually backfire here — letting developers buy up burned lots and throw up large multi-unit projects before longtime residents even had a shot at rebuilding their own homes. One of those laws, SB 1123 (2025), generally allows up to ten units per lot on qualifying parcels statewide. That’s a lot of density to drop on a neighborhood still grieving what it lost.
SB 1090 carves out a temporary exemption for Altadena. For three years — October 1, 2026 through roughly October 2029 — Altadena properties are shielded from SB 1123’s ten-units-per-lot rule and similar state density mandates. The goal, according to the bill’s legislative findings, is straightforward: give fire survivors room to rebuild their own homes before speculative, large-scale development reshapes the neighborhood around them. Want to read it for yourself? The bill text is posted on the California Legislature’s website at leginfo.legislature.ca.gov, and the Governor’s signing announcement is up at gov.ca.gov.
Importantly, SB 1090 does not stop all rebuilding or growth. Property owners can still build an accessory dwelling unit (ADU), often called a “granny flat,” on their lot. Owners can also still split a single lot into two under California’s existing lot-split laws. What the new law blocks is the jump to the much higher density, ten-unit-style projects that some worried could flood the market with investor-driven construction before residents finish rebuilding.
How This Affects Altadena Property Owners and Southern California Investors
If you are rebuilding a single-family home in Altadena, SB 1090 generally works in your favor. It limits competition from large multi-unit projects on neighboring or nearby lots for the next three years, which may help preserve the character of the neighborhood and reduce pressure from developers offering cash for distressed, fire-damaged parcels.
If you are an investor or developer who hoped to use SB 1123 to build higher-density housing in Altadena, this moratorium changes your math. Projects that penciled out at ten units per lot may no longer be feasible under the new density cap. You will need to revisit site plans, financing, and timelines for any Altadena acquisition made with density upside in mind.
Families who inherited a burned lot, or who are dealing with a trust or probate estate that includes Altadena property, should also take note. Estate planning documents written before the fire may not reflect current rebuilding rules, and heirs sometimes disagree about whether to rebuild, sell, or split a lot. These disputes can affect timelines for closing an estate or distributing property to beneficiaries.
Buyers and sellers across Los Angeles, Orange, San Bernardino, and Riverside Counties, including those in West Covina, Pomona, Ontario, Anaheim, San Bernardino, and Riverside, should also expect ripple effects. Altadena’s housing supply will likely grow more slowly than originally projected under SB 1123, which could affect regional housing prices and investment patterns nearby.
What You Should Do Now
- Confirm your lot’s zoning status. Check with the Los Angeles County Department of Regional Planning to see how SB 1090 applies to your specific parcel before you finalize rebuilding plans.
- Review any pending development agreements. If you signed a contract or letter of intent based on SB 1123 density assumptions, have the agreement reviewed, since the deal terms may no longer be achievable.
- Consider an ADU or lot split instead. Both remain legally available under SB 1090 and can add value or housing capacity without triggering the blocked high-density path.
- Update estate planning documents. If Altadena property sits in a trust or will, make sure the plan reflects current rebuilding rules and family intentions for the land.
- Keep records of fire-related damage and insurance claims. These documents often matter for permitting, financing, and any future real estate transaction.
- Talk to a real estate attorney before signing anything. Purchase agreements, construction contracts, and permit applications all need to reflect the new three-year moratorium.
How Tez Law P.C. Can Help
Tez Law P.C. assists Southern California property owners, families, and investors with real estate and construction matters, including rebuilding projects, lot splits, ADU planning, and reviewing purchase or development agreements affected by SB 1090. The firm also helps clients with related estate planning needs when fire-damaged property sits in a trust or passes through probate, and can assist with landlord-tenant or construction disputes that arise during rebuilding. You can learn more about these services on the real estate and construction page or the estate planning and trusts page.
Frequently Asked Questions
Does SB 1090 stop me from rebuilding my single-family home in Altadena?
No. SB 1090 does not stop ordinary single-family rebuilding. It generally blocks the jump to high-density, multi-unit projects under state density laws like SB 1123 for three years. You can still rebuild your home as it existed, or as otherwise permitted under local zoning.
Can I still build an ADU on my Altadena lot?
Yes. SB 1090 specifically preserves the ability to build an accessory dwelling unit (ADU) on qualifying lots. ADU rules are governed by separate state and local law, so you should confirm current requirements with the county before applying for permits.
Can I split my lot into two parcels under SB 1090?
Generally, yes. The law preserves existing lot-split rights, meaning qualifying property owners can still divide one lot into two under California’s lot-split statutes. Local zoning and subdivision rules still apply, so the process should be reviewed on a case-by-case basis.
How long does the SB 1090 moratorium last?
The exemption took effect October 1, 2026, and is designed to last three years, through approximately October 2029. Lawmakers could extend, shorten, or modify the law before it expires, so property owners should monitor updates from the California Legislature.
Does SB 1090 apply outside Altadena, such as in West Covina or Riverside?
No. SB 1090 is specific to Altadena, an unincorporated community in Los Angeles County affected by the Eaton Fire. Cities like West Covina, Anaheim, San Bernardino, and Riverside remain subject to statewide density laws such as SB 1123, unless local ordinances say otherwise.
SB 1090 adds a meaningful but temporary layer of protection for Altadena’s rebuilding community, while leaving some flexibility through ADUs and lot splits. Whether you are rebuilding a family home, managing an inherited property, or evaluating a real estate investment anywhere in Los Angeles, Orange, San Bernardino, or Riverside County, it helps to understand exactly how this law applies to your situation before you sign documents or file permits. Schedule a consultation with Tez Law P.C. through the firm’s contact page to discuss your Altadena property or rebuilding plans.
This article is general information, not legal advice, and reading it does not create an attorney-client relationship. Laws and agency practices change; contact Tez Law P.C. at 626-678-8677 or [email protected] about your situation. Prior results do not guarantee a similar outcome.