How to figure out correct plumbing and venting requirements for a remodel
Conflicting advice from professionals and contradictory local codes make it nearly impossible to find a definitive answer for DIY plumbing and venting layouts. Without clear guidance, homeowners are left guessing on critical setups like washer drains and pressure relief pipes, risking major code violations or abandoning projects altogether.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Hiring professional plumbers
- 2Searching online forums, the web, and asking AI for homework
- 3Trying to do the plumbing work yourself without a permit
- 4calling installers to have them route it to the nearest floor drain
- 5routing the pipe to the exterior or a drip pan
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I have had two plumbers come by, and they had different ideas about how to plumb this. One giving me an absurd estimate (almost 5 figures), and the other one ghosting me. I have looked all over the web, asked AI, been on the Terry Love forums, searched through reddit, and I cannot find a definitive answer.”source ↗
“so homeowners responsibility, not the company that installed it? guessing it depends on state codes”source ↗
“Redoing my laundry room (which includes a toilet), and the current plumbing is no bueno. (1.5” drain on the washer, no venting pretty much anywhere, etc.)”source ↗
“Pressure relief pipe pointed to the floor. no drain in the immediate area. the closest one is 10+ feet away under the laundry sink. we're in Minnesota. doesn't seem right to me”source ↗
Where this came up
People with this problem also raised
- 6Where do I run the vent for a washer installation?
- 2How to route a plumbing vent offset around obstacles
- 16How to figure out confusing plumbing and water flow directions
- 3Will half-inch pipes cause pressure drops in a second bathroom?
- 2How to vent a relocated plumbing sink or drain
- 2Does the vent duct go inside or over the hood?