Costa Mesa ADU Homes— Market Update (March 2026)
East Side Costa Mesa ADU Property listed for 2.5m. - 2bed 3 bath ADU
Dylan Serna analyzes the current ADU market in Costa Mesa, identifying six properties in Costa Mesa ranging from $1.29M to $3.695M, with two already transacted or under contract.
Current Listings Summary
Sold:
270 Albert Pl: $3.35M, 6 bed/2.75 bath, 3,000 sqft, built 2025, lot 7,812 sqft. Closed at $1,116/sqft, configured as luxury ADU maximizing livable space.
Under Contract:
934 Governor St: $1.29M, 2 bed/3 bath, 1,848 sqft. Has approved permits for reconfiguration into 4 bed/4.5 bath main home plus 1 bed/1 bath ADU (590 sqft). Projected rental income $2,200–$2,500/month.
Active Listings:
1789 Nantucket Pl: $3.695M, 4 bed/4.5 bath, 3,446 sqft, $1,072/sqft
236 Camellia Ln: $2.595M, 5 bed/3 bath, 2,157 sqft on 7,924 sqft lot, $1,203/sqft
168 Monte Vista Ave: $2.7M, 4 bed/3 bath, 1,673 sqft on 5,995 sqft lot, $1,613/sqft (trust sale)
212 E 19th St: $2.995M, 5 bed/4 bath, 2,578 sqft on 8,100 sqft lot
Key Market Insights
Price Strategy Split: Properties divide into two categories—rental-income configured units (investor-focused) and luxury ADU setups (lifestyle/family buyers).
Market Context: Costa Mesa's median home price around $1.5M (up 1.6% YoY), averaging 50 days on market. Approximately "35% of recent closings in the mid-coastal area were all-cash deals," indicating strong investor activity. For sellers evaluating timeline expectations, ADU properties in Orange County typically take longer to sell than multi-unit homes, though Costa Mesa's strong buyer pool shortens this window considerably.
Transaction Timeline: ADU properties expected to move in 45–60 days (financed) or 21–30 days (cash).
East Side vs. West Side Dynamics
East Side: Borders Newport Beach; detached ADUs generate $3,900–$4,500/month. Attracts high-net-worth investors and families seeking Newport proximity at lower prices.
West Side: Lower entry point with better cash-on-cash returns; newer development. Rental income $2,200–$2,500/month for 1 bed/1 bath units.
Investment Strategy Recommendations
Investors should prioritize properties matching their thesis: cash-flow focus benefits from rental-configured units on larger lots; long-term appreciation buyers prefer east-side luxury ADUs offering dual benefits of owner occupancy and equity building.
Costa Mesa remains ADU-friendly with no owner-occupancy requirement and up to 1,200 sqft detached unit allowances. When financing properties with ADU components, buyers should expect appraisals to report ADU living areas separately from the primary dwelling under standard Fannie Mae guidelines, which require documented comparable sales demonstrating market acceptance of the ADU configuration.
For investors comparing Costa Mesa's market strength to neighboring OC markets, see Anaheim's March 2026 market update and the Long Beach market analysis for competitive pricing and rental income benchmarks.
