Garages and utility closets are two of the most underused spaces in a Minnesota home. Most homeowners treat them as catch-all storage zones — but with a few smart plumbing upgrades, these areas can become some of the most functional rooms in the house.
Whether you’re finishing a garage, converting a closet into a laundry nook, or just tired of hauling muddy boots through the kitchen, here’s what you need to know about plumbing in these often-overlooked spaces.
Why Homeowners Are Adding Plumbing to Garages
A garage without water access is fine for parking cars. But the moment you start using it as a workshop, dog-washing station, or hobby space, the lack of a sink becomes a real problem.
Here are the most common garage plumbing upgrades we handle:
- Utility sinks — A deep basin sink lets you rinse paint brushes, wash hands after yard work, or clean off gear without tracking anything inside. Most garage utility sink installs tie into existing water lines and take about a day.
- Floor drains — If you’re dealing with snowmelt, car wash runoff, or workshop spills, a floor drain prevents water from pooling. In Minnesota, this one pays for itself every winter.
- Hot and cold water lines — Running both hot and cold to your garage opens the door for everything from a slop sink to a future beverage fridge with an ice maker.
- Washing machine hookups — Moving laundry to the garage frees up interior closet space and keeps lint, noise, and moisture away from living areas.
A Quick Note on Permits
Adding new plumbing lines to a garage in most Minnesota cities — including Minnetonka, Eden Prairie, and Plymouth — requires a plumbing permit. We handle the permit process and make sure everything meets code, including proper venting, backflow prevention, and drainage pitch.
Turning a Closet Into a Functional Plumbing Space
Closets aren’t just for clothes. Many homeowners convert interior closets into:
- Laundry closets — Stacking a washer and dryer in a hallway closet is one of the most popular remodels we see. It requires a water supply line, a drain, a 240V outlet for the dryer, and proper ventilation — but when done right, it saves a trip to the basement.
- Water heater closets — Tankless water heaters are compact enough to mount inside a standard closet. This frees up floor space in the basement or garage while putting hot water closer to the fixtures that need it.
- Wet bar nooks — A small sink and drain line can turn a dining room closet into a wet bar. These installs work best on interior walls where you can tie into existing plumbing stacks.
What to Watch For
Plumbing a closet means working in tight quarters with limited access. The biggest issues we run into:
- Ventilation — Water heaters in closets need proper combustion air. Tankless units solve this with direct-vent setups that pull air from outside.
- Access panels — Code requires that shut-off valves and connections remain accessible for maintenance. We install access panels so you can reach everything without tearing out drywall.
- Moisture control — Any plumbing in an enclosed space creates condensation risk. We insulate pipes and make sure drainage is airtight to prevent mold.
Pairing Plumbing Upgrades With a Full Space Makeover
Here’s what we’ve noticed after years of doing garage and closet plumbing work: the plumbing upgrade is almost never the only project.
Homeowners who add a utility sink to the garage usually follow up with epoxy flooring, better lighting, and shelving. Those who move laundry into a closet often invest in custom home storage to reorganize the space they just freed up. It makes sense — once you improve how a room works, you want the rest of the space to match.
Our advice? Plan the plumbing first. Water supply, drainage, and venting are the hardest things to move after the fact. Get those in the right spot, and everything else — cabinets, shelving, flooring — fits around them.
Common Questions About Garage and Closet Plumbing
How much does it cost to add a utility sink to a garage?
It depends on how far the new sink is from existing water and drain lines. A straightforward install on a shared wall might run $800–$1,500 for labor and materials. Longer pipe runs or slab work will push that higher.
Can I add plumbing to a detached garage?
Yes, but it’s more involved. You’ll need to trench water and drain lines from the house, and in Minnesota, those lines must be buried below the frost line (42 inches minimum). We also recommend heat tracing on supply lines to prevent freezing.
Do I need a sump pump if I add a floor drain in my garage?
In most cases, yes. Garage floors are often at or below the level of the main sewer line, so gravity drainage won’t work. A small sump pit with an ejector pump handles this.
Can a tankless water heater really fit in a closet?
Absolutely. Most residential tankless units are about the size of a carry-on suitcase and mount directly on the wall. They need a gas line (or dedicated electrical circuit for electric models), a water supply, and a vent — but no floor space at all.
When to Call a Plumber
If you’re planning any project that adds or moves water supply lines, drain lines, or gas lines in your garage or closets, bring in a licensed plumber before you start demo. We can map out the rough-in, flag any code issues, and coordinate with your contractor or builder so the plumbing goes in at the right stage.
Bedrock Plumbing serves homeowners across the Twin Cities metro, including Minnetonka, Eden Prairie, Plymouth, Edina, St. Louis Park, and surrounding communities. Give us a call or book online to talk through your project.