Rule Changes From AB 835 in California Could Shift the Multifamily Market in Big Ways

BiggerPockets Blog
Published: January 23, 2026
Regulations & Compliance

Summary

California is considering changes to building codes (AB 835) that could allow single-staircase multifamily buildings, potentially increasing housing supply and cash flow for landlords. However, this change is debated because of safety concerns. Hosts should monitor local building code developments and consider adding ADUs or upgrading existing units to boost cash flow.

Key Insights

  • The Pew Charitable Trusts estimates single-stair four-to-six-unit buildings cost 6% to 13% less to build.
  • Single-family housing starts hit an 11-month low in mid-2025, while multifamily starts soared 30.6% in June compared with the previous year.
  • AB 835 seeks to allow single-stair multifamily buildings with more than three units, potentially reducing construction costs.

Action Items

  • Monitor local building code developments related to multifamily housing and staircase requirements.
    Effort: low
    Impact: low
  • Implement a classic value-add strategy by upgrading kitchens and bathrooms to increase rents.
    Effort: medium
    Impact: medium
  • Consider adding ADUs (Accessory Dwelling Units) on your existing lot if zoning and space allow to generate more cash flow.
    Effort: medium
    Impact: medium

Common Mistakes

  • Retrofitting apartment buildings to accommodate new building code changes is usually far more expensive than it’s worth.

Related Videos

More from Regulations & Compliance

Council OKs short-term rental amendments - Glen Rose Reporter

This article reports on amendments to short-term rental regulations approved by a council. While specific details aren't provided, it suggests changes are taking place at the local level. Hosts should stay informed about local ordinances to remain compliant with the latest rules.

about 18 hours ago75
A wealthy Bay Area town passed an Airbnb ban. It might not even work. - SFGATE

A wealthy Bay Area town implemented an Airbnb ban, raising questions about its effectiveness. The article suggests this ban might not succeed. It highlights potential loopholes and challenges in enforcement, implying the ban could face difficulties in controlling short-term rentals.

about 20 hours ago75
Del Mar council approves short-term rental fees - San Diego Union-Tribune

The Del Mar council has approved new short-term rental fees. This action will directly impact hosts operating in Del Mar, potentially affecting profitability and operational costs. Hosts should prepare for adjustments related to these newly implemented fees.

1 day agoDel Mar, CA85

Curated by Learn STR by GoStudioM