How to Add a Laundry Room
to Your Second Floor

Carrying laundry baskets up and down two flights of stairs is the small daily annoyance that nobody mentions when they buy a two-storey home. Then they live there a year and the bedrooms generate three loads a week and they're done.

Second-floor laundry is one of the most popular renovation requests we get in Ottawa. It's also one of the easiest to mess up. We've ripped out two laundry rooms in Barrhaven this year alone where the original install was leaking into the kitchen ceiling below.

Here's the right way to add laundry upstairs in an Ottawa home, what drives the cost, and the seven decisions that determine whether it works for 20 years or leaks in 6 months.

Where to put it

The location decides everything else. The four common options:

Inside an existing closet

The most affordable option. Steal 30 inches of width from a hallway or master closet, stack a washer-dryer unit, add doors. Works if there's a wall directly below with plumbing access (typically a bathroom or kitchen).

Cost drivers: lowest when the bathroom directly below has accessible plumbing. The number climbs if you need to fish drains through finished space.

Inside an existing bathroom

Often the smartest play. The plumbing is already there. Adding a washer hookup is straightforward. Stacked units fit in a 30-inch space alongside a vanity. The bathroom looks like a bathroom most of the day and a laundry room when you need it.

Cost drivers: whether you need to expand the bathroom footprint or just add hookups to the existing layout.

In a dedicated room

Steal floor area from a master closet, an over-garage bonus room, or by reframing a hall closet. Best if you want a real laundry room with folding counter, hanging rod, and storage.

Cost drivers: the source of the borrowed space and the finish level you choose for the room.

In a converted hallway niche

Some Ottawa homes have wide upstairs hallways with a closet at the end. Reframing that closet into a laundry niche with bifold doors is workable. Tight, but functional.

Cost drivers: the reframing scope and the door and finish selections for the niche.

The biggest second-floor laundry mistake is putting it in the room that fits the dimensions. The right room is the one with plumbing access directly below.

The plumbing question that decides cost

A washer needs three things: hot water supply, cold water supply, and a 2-inch drain that ties into the home's main vent stack. The drain is the part that breaks projects.

If the room you're adding laundry to is directly above an existing bathroom, your plumber can typically tap into the existing 2-inch drain stack with minimal work. Cost impact: low. Time impact: 2-3 days plumber on site.

If the laundry is not above existing plumbing, the drain has to run horizontally through floor joists to find a stack, then drop down. Every horizontal foot of drain run requires 1/4 inch of fall per foot, and you have to get under finished ceilings to do it. Cost impact: significant. Time impact: 5-10 days plumber, plus drywall repair below.

If your home doesn't have a vent stack within 8-10 feet of the proposed laundry, you may need to add a new vent stack that runs from the laundry up through the roof. Cost impact: significant, and a day on the roof.

The pan, the alarm, the auto-shutoff

Every second-floor laundry needs three protection layers that ground-floor laundries don't.

Drain pan under the washer. A 32x32 inch metal or plastic pan with a 1-inch lip and a drain that ties into the standpipe. Catches small leaks before they soak into the subfloor.

Water leak detector. Two flat sensors on the floor (one beside the washer, one under it) wired to an audible alarm. Inexpensive at any hardware store. Most homeowners skip this. They shouldn't.

Auto-shutoff supply valves. Not the standard turn-handle valves. Solenoid valves with a leak sensor that automatically close the supply line when water is detected. A modest installed line item, and worth every dollar.

Without those three layers, a small washing machine hose failure becomes a major ceiling-and-kitchen reconstruction project. We've cleaned up the aftermath of exactly that scenario four times in the last decade.

The vent: drying clothes through 30 feet of duct

Dryer venting is the second most-failed component on a second-floor laundry. The dryer needs to vent to the exterior through a duct that's smooth-walled, sealed at every joint, and as short as possible.

Ontario Building Code §9.32 limits dryer duct length to 8 metres for most installations, with reductions for elbows. Each 90-degree elbow counts as 1.5-2 metres of straight duct. A second-floor laundry that's far from an exterior wall can blow through that limit fast.

Three solutions when the duct run is too long:

1. Move the laundry closer to an exterior wall. Best fix if you have flexibility on location.
2. Vent through the roof. Adds the cost of a roof penetration and exterior cap, but eliminates horizontal duct runs.
3. Use a heat-pump dryer. Vent-free. Plug in 240V and run. Heat-pump dryers carry a higher appliance price than a standard vented model, but that premium pays itself back in avoided venting cost on a difficult install.

What you should never do: vent into an attic, into a soffit, or into a crawl space. All three trap moisture and lead to mould. All three are also OBC violations that will fail an inspection.

The 240V circuit and the dedicated 120V

Electric dryers (the most common in Ottawa) need a dedicated 240V/30A circuit. Gas dryers need a dedicated 120V/15A circuit and a gas line, which means a TSSA-licensed gas fitter.

The washer needs its own dedicated 120V/15A circuit on a GFCI breaker. The lighting and exhaust fan should be on a separate circuit from the appliances.

If your panel can't accommodate three new circuits, you may need a panel upgrade or a sub-panel near the laundry, which adds electrical scope. Older Ottawa homes with 100-amp service can usually take three new circuits without issue. Homes still on 60-amp need an upgrade for any significant renovation, not just the laundry.

All electrical work needs ESA inspection and signoff. Don't try to DIY this part. A failed ESA inspection can void your home insurance and shows up in any future title search.

Floor structure and noise

Front-load washers can produce 1.0G+ of vibration during the spin cycle if not properly leveled and isolated. That vibration translates into floor framing and shows up two rooms away as a humming wall.

The fixes:

• Level the washer perfectly. All four feet making firm contact, locked nuts. The biggest source of unnecessary vibration is a washer that's even slightly off-level.
• Anti-vibration pads. Inexpensive rubber pucks under the feet reduce transmitted vibration significantly.
• Solid-blocked floor. If the room is on dimensional lumber joists (older Ottawa homes), add solid blocking between joists below the washer location to stiffen the floor.
• Concrete board subfloor. 1/2-inch HardieBacker over the existing subfloor before tile or vinyl adds mass and reduces resonance.

For older homes (pre-1970s), you may need an engineer's review. A second-storey laundry adds 250-400 lbs concentrated load, plus dynamic vibration. Most floors can handle it, but a 100-year-old joist system in The Glebe might need reinforcement.

The acoustic question

A laundry room above a master bedroom will be heard. Even with isolation, the spin cycle on a modern front-loader is audible.

Two ways to manage:

Don't put it above the bedroom. Put it above a hallway, a closet, or a less-used room.

Soundproof the floor assembly. Add resilient channel and a layer of mass-loaded vinyl in the floor system, and insulate between joists with mineral wool. This is an add-on scope line in the proposal.

If neither is feasible, accept the noise tradeoff and run laundry only outside sleeping hours.

Permits and inspections

A second-floor laundry triggers a Building Permit through MyServiceOttawa (City of Ottawa permit minimum $117 plus plumbing permit fees). The work typically requires:

• Building permit (structure changes if any)
• Plumbing permit (new fixtures and drain)
• Electrical permit through ESA (new circuits)
• Gas permit through TSSA (if gas dryer)

Inspections happen at rough-in (before drywall closes the walls) and at final. Skipping permits is common on small projects and is a real mistake on this one. A second-floor laundry leak that damages a downstairs ceiling will be a major insurance claim, and uninsured if the work was unpermitted.

What drives the cost

For a typical Ottawa second-floor laundry retrofit, the scope tiers run from least to most involved. A transparent written proposal itemizes which of these apply to your home:

• Closet conversion above an existing bathroom: the leanest scope, since the plumbing is directly below.
• Bathroom expansion to add laundry hookups: adds footprint and fixture work.
• Dedicated laundry room with finishes and storage: adds borrowed space, finishes, and millwork.
• Difficult plumbing routing through finished space: an add-on driven by drain run length and ceiling repair below.
• Panel upgrade if required: an add-on driven by your existing service and free breaker count.
• Acoustic floor assembly: an add-on when the laundry sits above a bedroom or quiet room.

The leanest scope requires existing plumbing access directly below. The fuller retrofits are driven by site conditions, which is exactly why the number belongs in a detailed written breakdown rather than a guess over the phone.

The seven decisions, in order

If you're planning a second-floor laundry, work through these in sequence:

1. What room is directly below the proposed laundry? (decides plumbing cost)
2. Does that room have an existing 2-inch drain stack within 10 feet? (decides drain routing)
3. How long is the dryer vent path to an exterior wall? (decides venting solution)
4. What's the panel amperage and free breaker count? (decides electrical scope)
5. What's the floor structure below and what room is below the spin cycle? (decides structural and acoustic work)
6. Is the laundry replacing storage, or adding to footprint? (decides demolition scope)
7. Are the supply hoses, drain pan, and auto-shutoff valves in the spec? (non-negotiable for second-floor)

Get those answered before you sign anything. A contractor who can't walk you through them clearly hasn't done enough second-floor laundries.

Dream Touch handles second-floor laundry retrofits as part of full bathroom renovations and full-home renovations. Free 48-hour walkthrough at 613-862-4555.