I have a question whether or not building a floor on top of concrete is a viable option to insert plumbing underneath for a half bath.
I am looking to finish a small porch off of my kitchen and turn it into a small powder room and hallway/mud area with an exterior door to the back of the house.
I have had several contractors come out to quote. This porch is a concrete slab located directly over the basement and it is part of the main house footprint (not an addition and it has basement access underneath) the porch is one step DOWN from the kitchen.
One contractor came up with the idea of raising the floor to the level of where the kitchen is so it looks cohesive (an not an add on) and run the plumbing under the new floor level into the wall at the basement ceiling and then tie into the existing plumbing that way. He would add new steps/railing outside to the backyard because raising the floor would essentially add a step into the house from the exterior. The other contractors were just going to leave the step down into the porch and drill through the concrete floor.
Is this a viable option for the plumbing to be placed under a new floor instead of drilling deep down into the porch slab and entering the basement that way? I would love to not have to step down into the bathroom if possible, but i am just curious why no one else thought of this option...so that's why i am questioning if its a normal way to go.
Any insight would be appreciated.