Building Setbacks & Zoning in Ada County, ID (2026)
3 county-level rules, plus city-specific rules for 1 city in Ada County, Idaho.
Verified from official government sources
Setback Rules
In unincorporated Ada County's Rural Residential (RR) district, Table 8-2-6-1 sets a 50-foot front setback along an arterial, collector or section-line street, dropping to 30 feet on other roadways and 25 feet if the lot doesn't front a road at all. The interior side setback is 25 feet, though neighboring rural residences can share a 10-foot line, and the rear setback is 25 feet.
Ada County Setback Minimums by Zoning District
Some RestrictionsAda County Code Table 8-2-6-1 (Rural Residential)
Setbacks Base Rural Residence Front Yard Setback (min) Arterial, collector, or section line 50' 50' street Other roadway 30' 30' Property line not fronting a roadway 25' 25' Side Street Setback (min) 30' 25' Interior Side Setback (min) (for rural residences, side prope...
Structure Height Limits
In the Rural Residential (RR) district, Ada County limits building height to a maximum of thirty-five feet (35'). Building height is measured from average ground level at the front wall to the highest roof point. Each base district sets its own maximum.
Structure Height Limits in Unincorporated Ada County
Some RestrictionsAda County Code Table 8-2-6-1; Ch. 10 (Building Height)
Building Height (max): 35'. Building Height: The vertical distance from the average contact ground level at the front wall of the building to the highest point of the coping of a flat roof or to the deck line of a mansard roof, or to the mean height level between eaves and ridge for gable, hip, or gambrel roofs.
Lot Coverage Limits
In unincorporated Ada County's Rural Residential (RR) zoning district, Title 8 Chapter 2's dimensional standards table caps lot coverage, the footprint of every structure on a parcel, at 10 percent of a base 10-acre lot. Choosing the Rural Residence option, a 1- to 2.5-acre parcel, raises the cap to 20 percent, and select institutional or stable uses on rural district land can reach 25 percent.
Ada County Lot Coverage Limits by Zoning District
Some RestrictionsAda County Code Table 8-2-6-1; Ch. 10 (Building Coverage)
Density and Development Base Rural Residence 1 Lot Size (min) 10 acres 1 acre (min) to 2.5 acres (max) 2 Building Height (max) 35' 35' 3 Lot Coverage (max) 10% 20% 4 Street Frontage (min) 100' 100' [...] NOTES:...
Building Setbacks & Zoning by City in Ada County
1 cities in Ada County have their own building setbacks & zoning rules. Each link goes to that city's dedicated page with code citations.
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