ADUs in Orange County: Rules, Costs & Resale Value

An accessory dwelling unit (ADU) can add housing flexibility and sometimes value—but success depends on lot conditions, city rules, and rental strategy.

State Framework, Local Details

California’s ADU laws set a baseline; each city applies overlays for setbacks, height, parking, and permits. Start with your city’s planning counter (or approved plans) before pricing a build.

Costs to Model

- Design, permits, utility connections
- Construction and timeline (interest carrying costs if financed)
- Solar and energy rules where applicable

Resale: Buyer Psychology

Some buyers love a permitted ADU for family or income; others worry about privacy and parking. Marketing should emphasize permits, rental history (if any), and metering clarity.

Planning an ADU before you sell?

Call Ekstrom Real Estate at (714) 624-0542—we help sellers position improvements that actually show up in offers.

ADUs in Orange County: Rules, Costs & Resale Value