Where Should You Put a Washer and Dryer in a Basement? What to Know First

Published: August 18, 2026

Putting a washer and dryer in the basement is one of the most common renovation moves in the GTA — it frees up space upstairs and keeps laundry out of the main living areas. But before you pick a corner and start running plumbing lines, there’s a question worth asking first: is that part of your basement actually dry enough to handle it?

A washer and dryer are two of the worst appliances to have in a basement that isn’t properly waterproofed. One connects directly to your water supply and drain lines, and the other runs hot and produces moisture of its own. Put either one in the wrong spot, and you’re combining a water-using appliance with the one area of your home most likely to flood.

Why Does Basement Location Matter for a Washer and Dryer?

Basements are naturally the lowest, dampest part of most homes, and they’re the first place water goes during a heavy rain, spring thaw, or sewer backup. A washer supply line leak, a hose failure, or a backed-up drain is a nuisance on a main floor — it’s a disaster in a basement that already has a moisture problem, because there’s nowhere for the water to go but into your flooring, drywall, and the appliances themselves.

Dryers add a second issue: heat and humidity. A basement that already runs damp or has poor air circulation will hold onto that moisture longer than an upstairs laundry room would, which can encourage mould growth behind and around the unit.

What Should You Check Before Installing Laundry Appliances in the Basement?

Before you commit to a location, a few things are worth confirming:

• Has this basement ever flooded or shown signs of seepage? Staining near the floor, efflorescence on the walls, or a musty smell are all signs the space needs to be addressed before appliances go in, not after.
• Is there a functioning floor drain nearby? A washer location without one is a much bigger risk if a hose ever fails.
• Is there a sump pump, and is it working? If your basement relies on a sump pump to stay dry, that pump needs to be reliable before you place appliances near it — a pump failure during a storm can mean standing water reaching a washer or dryer within hours.
• Does the home have a backwater valve? Homes without one are at higher risk of sewer backup reaching floor drains and laundry connections during heavy rain events, which is an increasingly common issue across the GTA.

Does a Basement Need to Be Waterproofed Before Adding a Laundry Room?

If there’s any history of moisture in the space, yes. Framing a laundry area, running new plumbing, and installing drywall around a washer and dryer only makes sense once the underlying water issue is solved. Waterproofing first — interior waterproofing for existing seepage, or a proper sump pump installation if the basement doesn’t already have reliable drainage — protects the renovation you’re about to pay for, instead of building a laundry room on top of a problem that’s guaranteed to resurface.

For homes at risk of sewer backup during heavy rain, a backwater valve installation is also worth considering before finalizing a basement laundry location, especially if the appliances will connect near existing floor drains.

What Happens If You Skip This Step?

The appliances themselves become the risk. A washer or dryer sitting in a basement corner that floods even occasionally is exposed to water damage, corrosion, and electrical hazards that a main-floor laundry room never has to deal with. Beyond the appliance itself, water reaching a washer or dryer setup often means damaged flooring, drywall, and — if it goes unnoticed for even a day — mould that spreads well beyond the laundry area.

If you’re already thinking through appliance placement and want to understand more about how basement appliances hold up over time — and what to do if one is showing signs of water-related wear — Maydone has some useful resources on appliance servicing and repair for homeowners dealing with exactly this kind of situation.

What’s the Right Order of Operations for a Basement Laundry Room?

The safest sequence is: assess the basement for moisture history, address any waterproofing or drainage issues, confirm the sump pump and backwater valve (if needed) are in good working order, and only then plan the laundry room layout, plumbing, and appliance placement. Doing it in reverse — installing appliances first and hoping the basement stays dry — is the most common and most expensive mistake homeowners make with this project.

FAQ

Is it safe to put a washer and dryer in an unfinished basement?

It can be, as long as the basement has no active moisture issues, has a functioning floor drain nearby, and drainage (sump pump, backwater valve where needed) is confirmed to be working properly.

Should a washer be placed near a floor drain?

Yes, whenever possible. A nearby floor drain significantly reduces the damage from a hose failure or overflow.

Can a wet basement damage a washer or dryer?

Yes. Standing water or chronic dampness can corrode components, damage wiring, and shorten the lifespan of both appliances significantly.

Do I need a sump pump before installing basement laundry appliances?

If the basement has any history of water seepage or a high water table in the area, yes — a sump pump is one of the most reliable ways to keep the space dry enough for appliances long-term.

What’s the first sign a basement isn’t ready for a laundry room?

Musty odors, visible staining near the floor or walls, or efflorescence (white mineral deposits) are all early warning signs worth addressing before any renovation work begins.

How much does it cost to waterproof a basement before renovating?

Interior waterproofing in Toronto typically runs $79–$205 per linear foot, depending on the extent of the issue. A free on-site assessment is the most accurate way to get a real number for your space.

Call a professional as soon as you notice the dampness returning after every rain or snowmelt. The earlier it’s diagnosed, the less damage it causes. Reach Direct Waterproofing anytime at 416-454-7575 for a free estimate.