ADU Rules in Coeur d'Alene, Idaho

Coeur d'Alene is a resort city in Kootenai County, northern Idaho, known for its stunning lake, growing population, and proximity to the Spokane, Washington metro area. The city has experienced rapid growth driven by remote workers and migration from California and Washington. Idaho has no statewide ADU preemption law — Coeur d'Alene's local zoning governs.

Permitted ADU Types

• Detached ADU: Standalone structure in rear yard
• Attached ADU: Addition with own entrance and kitchen
• Garage Conversion: Converting existing garage
• Interior Conversion: Converting existing space

Size Limits

Setbacks

Per Coeur d'Alene Zoning Ordinance:

• Front: Per base zone
• Side: 3–5 feet minimum
• Rear: 5 feet minimum

Height

• Detached ADU: Maximum 20 feet
• Cannot exceed height of primary dwelling

Lake and Shoreline Considerations

Coeur d'Alene Lake has special protections:

• Properties near the lake may have shoreline setback requirements
• Idaho Department of Lands regulates activities near the lake bed (state-owned)
• Water quality protection ordinances may apply near the shoreline

Wildfire Interface

Parts of Coeur d'Alene and Kootenai County are in the Wildland-Urban Interface (WUI). ADU construction in WUI areas may require fire-resistant materials and defensible space.

Permit Process

1. Check zoning: Verify zone via Coeur d'Alene's GIS portal
2. Shoreline check: If near Lake CDA — Idaho Dept. of Lands
3. WUI check: If in wildland interface area
4. Submit plans: Coeur d'Alene Planning Department
5. Building permit and inspections
6. CO: Required before occupancy

Contact

City of Coeur d'Alene Planning Department 710 East Mullan Avenue, Coeur d'Alene, ID 83814 Phone: (208) 769-2240 Website: cdaid.org/planning

Disclaimer: Verify current Coeur d'Alene zoning requirements and shoreline regulations before starting any project.