ADU Contractor in Herriman, Utah

Herriman calls them I-ADUs, and the city spells out what qualifies. You must own the home and live in it. The lot must be in a residential or agricultural zone and at least 6,000 square feet, with only one accessory unit per lot. The unit has to be inside the home’s livable space, share a wall with it or sit above an attached two-car garage, and the house can’t become a duplex with two rentals. Rentals run 30 consecutive days or longer; short-term rentals are prohibited.

The basement is where most Herriman ADUs go. We design the apartment around the builder’s bathroom rough-in and mechanical room, add a kitchen, put bedrooms where egress windows can be cut, and plan the way in — Herriman allows the unit to share the home’s entrance or have a new one on the side or rear. On sloped foothill lots a basement walkout often makes the best entrance, and the site plan then shows its setbacks, size and stair count.

The paperwork has an order. Planning reviews the I-ADU application first: a site plan with parking, the exterior access and the path for emergency crews, a floor plan, a photo of the home showing where the “B” unit address will go, and a notarized owner affidavit that is recorded with the county. Then come the building permit and inspections. The final inspection looks for the B address, a hard-surface walkway from the unit’s door to the street, egress windows with ladders where needed, working smoke and CO alarms and a fire extinguisher visible from the entrance. After the certificate of occupancy and a city business license, the unit can be rented.