Is there a DIY-friendly solution for installing a laundry sink in an unfinished basement without the need for extensive plumbing work?
Asked by Harald Stange 
3 months ago
Last Updated: June 15, 2024
I’m having trouble finding the right resources online, so I thought I would ask here instead.
I have an unfinished basement with no bathroom rough-in, and the laundry on the upper floor is a stacked unit without a sink.
I want to install a laundry sink in the basement for bathing the dogs and other miscellaneous tasks, but I want to do it myself without having to break up concrete or deal with complex plumbing to drain it.
Is there a drain diverter or some kind of drain apparatus that can be used to drain into a floor drain, or an alternative to hard plumbing it into the house?
Thanks for any advice!
I’ve seen separate sinks that people connect with a plastic drain pipe to the main sewer line. It’s a simple solution.
Did you mention if you have any experience fixing things, if the house is connected to the city sewer or a septic system, and if the basement tends to flood? Here’s an idea for you: they have these small tanks with pumps that could help in situations like yours. You could install a laundry sink and a vented drain. Make sure the vent is placed high on the ceiling of the basement. I’d suggest using a one-way vent instead of connecting it to the stack. Then you’ll have to connect the discharge to the sewer ‘out’ stack, which I assume is in the basement. Place it as high as you can. And don’t forget to have a GFCI outlet nearby for the pump.
Reminder to check the one-way vent for proper functioning.
Can you tell me the location of the drain stack in the basement compared to where you want the sink to be? What material is the drain stack made of and are you comfortable working with it?
Is there plumbing available downstairs? Are you also considering running water?
I’m comfortable with minor DIY plumbing projects, like changing out a toilet/sink, but I don’t mess with pipes inside walls.
I’d suggest hiring a professional plumber to help with setting up the plumbing system and drains.
After that, you can move the washer/dryer downstairs, create space for side by side placement (even if you stick with stacking for now), add a laundry sink, and set up a doggy wash station (similar to a half-size shower).
Have you considered using a Saniflow pump for the job? Check out this link for more information: https://www.saniflo.com/us/installing-a-kitchen-or-laundry-room/225-saniswift.html
Your idea is simple, but the topic itself can get quite complex as it involves drains, vents, plumbing supplies, and possibly electrical work. It’s more than just setting up a room. Make sure to thoroughly investigate and plan, otherwise you might end up with a subpar result. When you eventually expand to a full bathroom, you’ll need even more equipment. Familiarize yourself with the plumbing in your basement, especially the drainage system. Does your basement have a floor drain? That might indicate a connection to the city sewer. Even a sump pump requires careful planning for a successful installation. Take your time, plan ahead, and aim slightly higher than your current goal to avoid future setbacks.
In the 50s and 60s, my mom used to have her washing machine drain water directly into the basement sewer. Running hot and cold water to laundry tubs shouldn’t be too difficult.