SB 677
Improving SB 9 & SB 423
SB 677 will make it easier to build housing of all types, faster and more affordably. SB 677 improves existing law ensuring the right to build duplexes and fourplexes in residential neighborhoods, and strengthens streamlining for multi-family properties in urban areas.
SB 9 (Atkins 2021) and SB 35/423 (Wiener) are key tools in our fight to build new homes more quickly and affordably, but their initial implementation has exposed loopholes in the existing law that need improvement and strengthening. SB 677 integrates what we’ve learned from the first years of these existing laws to allow more homebuilding in the areas that need it the most.
With the passage of SB 9 in 2021, California became one of the first states to legalize up to four homes per property, and streamlined lot splits in residential neighborhoods to increase the supply of smaller, lower-cost homes statewide. But some of the provisions in the law have been abused by cities and anti-housing neighbors, preventing its effective use for actually building more housing.
Similarly, in 2023, a coalition of housing advocates and labor unions passed SB 423, an extension of SB 35 – one of the most effective pro-housing laws of the past decade. But provisions in that bill have also proven to be challenging to translate into the policy’s full home building potential.
SB 677 updates both SB 9 and SB 423, improving both bills to make it faster, easier, and more affordable to build homes of all types in the neighborhoods where they are needed the most. SB 677 will allow these laws to deliver more fully on their potential.
Updates
- SB 677 was introduced on February 21, 2025.
Author
- Scott Wiener (SD 11)
Sponsors
- California YIMBY
- Housing Action Coalition
- LISC San Diego
Resources
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