Zoning Overlays & Bonuses in Ada County, ID (2026)
1 county-level rule, plus city-specific rules for 1 city in Ada County, Idaho.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Ada County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Density Bonus Law
Ada County caps residential density in a Planned Unit Development at three dwelling units per acre unless the comprehensive plan sets a higher urban density, but a builder can earn up to a 25% bonus by dedicating open space or public amenities on the master site plan.
Density Bonus Rules in Unincorporated Ada County
Some RestrictionsAda County Code 8-6-22(G)(3)(b)
Density Bonus: An increase in the average residential density may be allowed by incorporating dedicated open space or public use dedications into the planned unit development. All dedications shall be shown on the master site plan. (1) Additional Open Space Dedication: For each full additional percentage point of property in dedicated open space above the minimum requirements, the average resid...
Zoning Overlays & Bonuses by City in Ada County
1 cities in Ada County have their own zoning overlays & bonuses rules. Each link goes to that city's dedicated page with code citations.
All Ada County ordinances
See every category we cover for Ada County: parking, noise, fences, fires, animals, pools, and more.
Ada County Ordinance Hub →