Its a grey area, some builders refuse to do them, others are #yolo! We have 2 floor drains in our recently built house/attached garage. They go back into the basement and tie in sanitary.This quote is hidden because you are ignoring this member. Show Quote
If you have a detached you're not going to want to tie them back to the house so that video posted above it a good idea. Just make a trench and shop vac it out if it gets filled up.