How to install a vanity over floor pipes in a tight space
When water supply lines come up through the floor inside a tight alcove, you cannot simply drop the cabinet straight down over them. This leaves installers with almost no wiggle room to maneuver a heavy 48-inch vanity into a narrow opening without hitting the pipes.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Cutting holes in the bottom of the vanity and lifting/lowering it directly over the pipesDid this help you?
- 2Removing vanity doors to hold it from the inside while placing itDid this help you?
- 3Cutting the water lines shorter to reduce the height needed to lift the vanityDid this help you?
- 4Asking for advice on online forumsDid this help you?
- 5Changing a galvanized nipple to a closed nipple to get it flush with the wall.Did this help you?
- 6Using a street trap adapter and a Fernco fitting.Did this help you?
- 7Ensuring proper wood backing is installed inside the wall during the rough-in phase.Did this help you?
- 8Putting foam window seal on surfaces to prevent the sound of ceramic rubbing on ceramic.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“First time doing it. Any tips?”source ↗
“There is no room for the trap adapter to stand out because you need all the room to push the trap arm into the wall because the drain comes down 3 inches from the wall but the trap can't go forward or sideways because the pedestal is too far back and too narrow.”source ↗
“We added on a new bathroom and this is how they plumbed our vanity areas (through the floor) we have 48” vanities that are going into a 49” opening. Do we have to lift vanity over these pipes?”source ↗
“Sounds easy but we have no room on either side of the vanity to drop this over easily”source ↗
“They not only suck, but they expose all the plumbing. Everything is exposed. But there is no room for the trap unless it is flush with the wall.”source ↗
“I just spent from 11 to midnight finessing the wall bracket so it is neither too high nor too low. And level.”source ↗
Where this came up
People with this problem also raised
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- 2Connecting a linear shower drain right next to a wall stud
- 2How to install vinyl flooring around a base cabinet without molding
- 13Does every sink need a P-trap?