Boucher will be adding 18 service bays when it expands its building at 1610 Manhattan Drive by 9,708 square feet for a service center.
The Waukesha Plan Commission approved the preliminary plans for the addition Wednesday night.
The car dealership will have to return to the Plan Commission with final plans, including additional details about landscaping and dumpsters.
In other Plan Commission news, a proposal for a new 12-unit building to replace the apartments at 343 Coolidge Ave. that were destroyed in a fire was placed on hold. thanks to alert residents living in the building.