ADU Builder in Coronado
Custom ADUs designed, permitted and built by one team — engineered for Coronado's citywide Coastal Zone and small-lot, historic context.
Get your free feasibility check → or call (619) 404-0125Coronado is among the most exclusive and most constrained places to build an ADU in San Diego. The entire island sits in the Coastal Zone, lots are tight and valuable, and the historic character of many streets shapes what's appropriate. A Coastal Development Permit is the norm, not the exception, so design and permitting experience matters from the very first sketch.
Why build an ADU in Coronado?
Citywide coastal review handled
The whole island is in the Coastal Zone — we design and document to clear the CDP the first time.
Small-lot, high-value design
Coronado lots are tight and valuable; we maximize livable space within strict limits.
One accountable team
Architecture, permitting and construction under one roof — one contract, one point of contact.
Coronado ADU rules at a glance
| Jurisdiction | City of Coronado (citywide Coastal Zone) |
|---|---|
| Max detached ADU | Follows state limits (up to ~1,200 sq ft) — confirm Coronado's local specifics |
| Height | 16 ft baseline (18 ft near transit) — confirm local limits |
| ADUs per lot | 1 ADU + 1 JADU |
| Coastal permit | Yes — CDP required citywide |
| Owner-occupancy | Not required for ADUs (required for JADUs) |
Coronado applies the state baseline, but a citywide Coastal Zone means a CDP for nearly every project, and historic-district context can affect design. We confirm Coronado's exact current limits for your lot — see our San Diego ADU regulations page.
What it costs
Coronado is an ultra-premium island market, so projects typically sit at the higher end of San Diego's 2026 ADU ranges. We give you a real budget in your consult — see our 2026 cost guide.
How we work — design, permits & build under one roof
- Free feasibility check — we confirm your lot's exact rules and what fits.
- Custom design + 3D — we refine the layout and show you the result.
- Permitting — full plan set, structural, and the coastal permit if required.
- Construction — built by our team, on a defined schedule.
- Keys — final inspection, certificate of occupancy, and warranty.
See what your Coronado property can build
We'll confirm your exact rules, what fits your lot, and a realistic budget and timeline — free, with no obligation.
Book your free feasibility check →Coronado ADU — frequently asked questions
Do I need a Coastal Development Permit in Coronado?
How big can an ADU be in Coronado?
Can I convert my garage to an ADU in Coronado?
Does Coronado's historic character affect my ADU?
How long does ADU approval take in Coronado?
Keep exploring
Note: ADU rules change and vary by lot and overlay. Figures reflect our reading of state and local rules as of May 2026 and are not legal advice — we confirm your exact, current requirements in your free feasibility check. IL Total Design & Build, CSLB #1058676.