Accessory building construction in Boise, ID

Yes, a building permit is required in Boise for most accessory structures over 120 square feet, and ADUs require a full permit package including a site plan, floor plans, and elevations. Any electrical or plumbing work in the structure requires separate trade permits as well.

In Boise, a detached ADU cannot exceed 900 square feet or 70 percent of the primary dwelling's total floor area, whichever is smaller. The ADU is also limited to two bedrooms, and only one ADU is allowed per lot.

If your property is inside Boise city limits, the City of Boise Planning and Development Services issues your permit. If your parcel sits in unincorporated Ada County, outside any city boundary, Ada County Development Services is the permitting authority, so confirming your jurisdiction before you apply is an important first step.

No, building without a required permit in Boise can result in code violations, fines, and required demolition of unpermitted work. Dreamworx Renovations LLC builds accessory structures in Boise and across the Treasure Valley with proper permits in place from the start.

Electrical and plumbing work in an accessory building each require their own separate trade permits in Boise, in addition to the base building permit. This applies whether the structure is a detached garage, workshop, or ADU in Boise or the surrounding Treasure Valley cities.

In Boise, accessory structures are often allowed closer to rear and side property lines than the primary home, sometimes as close as three feet, but the exact setback depends on your zoning district and the height of the structure. Dreamworx Renovations LLC reviews your lot's specific zoning requirements before any accessory building project begins.