[ArtisanRemod]

I think the real question here is if you can set a bath heat mat over ditra with Ardex slc, in a wood framed house with a 5/8' subfloor.

 

[ArtisanRemod]

To answer your question, I sub for several local flooring contractors and it works out well. If I have an opening in my schedule I can usually fill it with one of them with just a few quick calls.
I like the fact that it's in and out and get paid. No time estimating, chasing material, chasing money.
I do know that some of the larger places will try to pay you as little as absolutely possible. I have no interest working for them.
Good luck

 

[ArtisanRemod]

New builds are full of immigrants here. Tons of hackery. The stores I sub for are not bottom feeders. They want a professional to represent them, and will pay for it.