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Question DetailsAsked on 1/25/2017

Im replacing a bathtub with a shower and I need the ttrap moved/extended 2- 2 1/2 feet.Whats a ballpark estimate.

The walls are open and the tub is removed already.

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1 Answer


Assuming wood framing and subflooring, probably $150-300 in most areas. If in a concrete on-grade slab, probably more like $300-600 range - possibly more depending on amount/type of reinforcement in slab, whether shower base allows the drain line to come in above slab level or not to maintain slope (added 1/2-1 inch of rise needed), and how far "back" down the drain line he has to go with the concrete cutting and replacement to get the proper slope and trap into the line.

If in elevated concrete slab (structural floor slab) or structural concrete slab tying concrete walls together (monolithic slab and walls, without expansion strip around edge of slab - or pre/post-tensioned with cables) you should have a Structural Engineer advise on how to do this and maybe even be there during the concrete removal - because cut the wrong reinforcing (especially in pre-stressed or post-tensioned slabs) and you can cause MAJOR problems.

I worked one investigation into a 6 story building collapse because some plumber cut an 8 foot long trench for a new sewer run in a post-tensioned elevated concrete floor slab that then collapsed because he cut several post-tensioning cables, pretty much bringing the building down with it, so don't mess with cutting into elevated concrete slabs.

Answered 3 years ago by LCD

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