You can build 10 units on a vacant single-family zoned lot, per SB-684.

[Felicia Nitu]

SB-684 makes it easier to develop up to 10 units on vacant lots in single-family zones without needing a zoning change. It applies to urban lots under 5 acres, setting clear size and spacing rules to keep new housing functional and efficient.

How SB-684Property Works 

// Lot & Unit Size Requirements

· The lot must be vacant and in a single-family zone.
· Each lot must be at least 600 square feet.
· New residential units cannot exceed 1,750 square feet each. 

// Setbacks & Spacing

· A minimum 4-foot setback is required from side and rear property lines.

// Tenant Protection & Restrictions

· If a home on the lot had tenants in the past 5 years, SB-684 still applies, but you cannot demolish or alter the existing structure.

How does SB-684 Benefit Real Estate Agents and Investors?

SB-684 creates new development opportunities, turning vacant lots into high-value listings. Agents can close more deals, sell more units, and earn bigger commissions, all without large-lot requirements or rezoning hurdles. It’s a powerful way to help clients build and sell in single-family zones.