How much does it cost to build an ADU in Santa Monica, California in 2026? This pricing guide covers every type of accessory dwelling unit, from a junior ADU to a brand-new detached backyard home, plus what drives the price and the permits and fees to plan for.
2026 Santa Monica ADU prices by type
| Item | Price |
|---|---|
| Junior ADU conversion | $75,000 – $150,000+ |
| Garage conversion | $125,000 – $250,000+ |
| Attached ADU | $200,000 – $375,000+ |
| New detached ADU | $250,000 – $500,000+ |
Planning an ADU in Santa Monica? Give All Exclusive Construction, Inc. a call.
- Licensed & insured (CA Lic. #1120170)
- 5.0★ Google rating
- Free consultations and written estimates
- Phone(818) 836-1722
- Websiteallexclusivepro.com/adu-builder-santa-monica
- Address301 Arizona Ave, Santa Monica, CA 90401
- HoursMon–Fri, 8 AM – 4:30 PM
- ServingSanta Monica, Westlake Village, Santa Clarita, Malibu, Calabasas, Thousand Oaks, Beverly Hills, Pacific Palisades, Culver City, Agoura Hills and more across L.A. and Ventura Counties
Sources & links
- Full Santa Monica ADU pricing guide: allexclusivepro.com/adu-builder-santa-monica
Price ranges are 2026 planning ranges from All Exclusive Construction's Santa Monica ADU pricing guide. Your price depends on size, site and scope. Get a written estimate for your project.