Basement / Junior ADU in Boise, Idaho
Verified basement / junior adu businesses in Boise, ID
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Frequently Asked Questions — ADU Builders in Boise
How much does it cost to hire an ADU builder in Boise?
ADU construction costs in Boise, Idaho vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Boise to get accurate quotes for your specific project.
How long does it take to build an ADU in Boise?
In Boise, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Idaho local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in Boise?
Yes, a building permit is required for ADU construction in Boise, Idaho. Your ADU builder will typically handle the permit application as part of their service. Idaho has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in Boise?
Common ADU types in Boise include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Boise ADU builder can advise on what's allowed on your specific parcel.