AB 1033 San Diego County: Cash Buyers Can Now Purchase Standalone ADUs for $450K-$500K Starting April 4, 2026

What Changed on April 4, 2026

On March 4, 2026, the San Diego County Board of Supervisors unanimously adopted an ordinance implementing AB 1033, which took effect April 4, 2026. This groundbreaking policy allows property owners in unincorporated areas to sell ADUs separately from primary residences through a condominium conversion process.

Before April 4, ADUs were legally bound to the primary residence—you couldn't buy just the ADU. Now, both attached and detached ADUs are eligible for condominium conversion in unincorporated San Diego County, creating an entirely new asset class for investors.

The policy applies specifically to unincorporated areas, which includes prime coastal neighborhoods like unincorporated Pacific Beach, La Jolla, Mission Beach, and Bird Rock—exactly where coastal property values command premium prices.

The Investment Numbers: $450K-$500K vs $1.3M-$2.4M

Here's where the math gets interesting for cash buyers. Pacific Beach homes command $1.3 million median prices, while La Jolla reaches $2.4 million. But a 600-800 square foot ADU condo in these same neighborhoods could sell for $450,000-$500,000—accessing coastal living at roughly one-third the cost.

For property owners who built ADUs for $250,000, selling as a condominium for $450,000-$500,000 could produce $175,000-$225,000 profit after conversion costs. This creates motivated sellers in the market—homeowners who want to monetize their ADU investments quickly.

Rental income potential is equally compelling. Detached ADUs in San Diego generate $2,500-$4,000 monthly rental income, while studio units rent for $1,900-$2,400 and one-bedroom units for $2,300-$2,900. At a $475,000 purchase price with all-cash, a $2,800/month rental ADU generates a 7% gross yield—competitive with traditional rental properties but in high-demand coastal zones.

Where to Find Eligible ADUs in Unincorporated Coastal Areas

The AB 1033 ordinance applies only to unincorporated San Diego County—not the City of San Diego proper. This is critical for buyers to understand. Unincorporated coastal areas include:

• Unincorporated sections of Pacific Beach and La Jolla
• Parts of Mission Beach and Bird Rock
• Del Mar and Solana Beach unincorporated zones
• Coastal areas between incorporated city boundaries

Cash buyers should verify property addresses with San Diego County Planning & Development Services to confirm unincorporated status. Properties within the Coastal Overlay Zone require additional Coastal Development Permit (CDP) considerations, though exemptions exist for ADUs more than 300 feet from high tide or 50 feet from bluff edges. Understanding ADU regulations and compliance requirements is essential for due diligence.

Critical Deadline: July 2, 2026 Policy Changes

When the Board of Supervisors approved AB 1033 on March 4, they also directed county staff to return within 120 days with policy options to promote first-time homebuyers, including owner occupancy requirements and first right of refusal for existing tenants. That 120-day deadline falls around July 2, 2026.

What does this mean for cash investors? The current market window operates under minimal restrictions. After July 2, new policies could prioritize first-time buyers, impose occupancy requirements, or create tenant purchase protections that complicate investor acquisitions. Cash buyers have roughly 11 weeks to act before potential policy changes alter the competitive landscape.

Due Diligence Checklist for ADU Purchases

Why Cash Buyers Win This Market

This is an emerging market with limited transaction history. Sellers converting ADUs to condominiums for the first time prefer certainty and speed—exactly what cash buyers provide. No appraisal contingencies, no financing delays, and ability to close in 14-21 days gives all-cash offers significant competitive advantage.

Additionally, San Jose completed California's first AB 1033 transaction in August 2025, meaning the entire state market has less than one year of precedent. Early-mover investors who understand the conversion process, coastal permit requirements, and HOA structures can negotiate better terms than later entrants once the market matures.

AB 1033 creates a rare moment in real estate: a brand new asset class in established, high-demand coastal markets. Cash buyers who move quickly—before July 2 policy changes and before market saturation—have opportunity to acquire coastal San Diego properties at discounts while generating $2,500-$3,500 monthly rental income.

Frequently Asked Questions