Learn what it costs to build a garage apartment ADU (Accessory Dwelling Unit) in Minneapolis or St. Paul, and what drives those costs.
South Minneapolis ADU
Building a Garage Apartment in South Minneapolis
Follow along as we build an Accessory Dwelling Unit (ADU) above a new garage in South Minneapolis.
Cutting Access to the Plumbing Line
To gain access to existing plumbing lines, we cut the Lower Level floor in the home to connect the ADU plumbing to the main in the house. Our carpenter removed the vinyl floor and underlayment. and opened up the exterior wall where the plumber roughed in and also the interior wall between the family room and the bathroom.
When we opened up the wall common to the bathroom we found the main plumbing was facing the opposite direction, which meant we would need to do one of 3 things:
- Remove floor and trench all the way to the front of the home (down the hall, through the laundry room, and into the mech. room) This option would create extra cost and be very disruptive to the clients.
- Introduce a sewage injector that would work to expel the waste from the ADU to the main drain in the house. This would be additional cost and would need to be accessible for service and repair.
Finally, the option that we thought was the best course of action, and the option client chose:
- Remove the toilet and sink in the lower level bath and cut up a few more square feet of tile and concrete to tie into the main drain. Although, this option also added additional cost and was disruptive, working with the client on this issue we agreed this was the best option.
Our goal was to solve the plumbing installation while keeping this process as minimally disruptive to the family as possible.