Need house plans or an addition design in Ada County, ID? Ada County has about 535,799 residents (2024 estimate) and 6 incorporated cities and towns. Describe your project once: architects and designers who work in Ada County get back to you.
Zoning and building permits in Ada County are handled by each city, or by the county in unincorporated areas.
Services available in Ada County
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Custom home design
Design of a new home, from concept to permit and construction drawings.
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Addition or remodel plans
Plans for an addition or a major remodel, ready for the permit and the builder.
Frequently asked questions in Ada County
Do architects and designers cover the whole of Ada County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Architects in Idaho: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.