Fast and Reliable Dishwasher Replacement and Installation
Installing a dishwasher involves three separate connections: water supply, drain, and electrical. When all three are done correctly and to code, a built-in dishwasher runs quietly, drains cleanly, and gives no trouble for years. When any one of them is done poorly, you end up with leaks under the cabinet, drain backflow into the unit, or an electrical connection that fails inspection. Plomberie 5 Etoiles handles the plumbing side of dishwasher installations across Montreal, Laval, the South Shore, and the North Shore, for both replacements and new hookups.
RBQ Licensed (#5663-4538-01) · CMMTQ Member · CAA-Quebec Recommended · 4.8 Stars, 145+ Google Reviews
Get a quote Click to callWhy a Licensed Plumber Matters for Dishwasher Installation
Many appliance retailers and big-box stores offer dishwasher installation as an add-on to delivery. These services typically cover a straightforward swap of an existing unit in a detached house, and they explicitly exclude condos, duplexes, and multi-unit residential buildings where a licensed plumber is required.
If you live in a Montreal condo, a duplex, or a triplex, you likely need a licensed RBQ plumber for any work involving water connections. We are RBQ licensed (#5663-4538-01), carry full liability insurance, and can provide documentation of the work for your condo board or building management if needed.
Beyond licensing, a plumber brings the diagnostic experience to identify and address any complications before they become problems: an undersized supply valve, a drain connection that needs an air gap, or a cabinet that needs modification to fit the new unit.
Get a quote Click to callWhat Dishwasher Installation Involves
Replacing an Existing Dishwasher
Replacing an existing unit is the most straightforward scenario. The supply, drain, and electrical connections are already in place. Our process:
- Disconnect the existing dishwasher (supply shutoff, drain hose, electrical)
- Remove the old unit from the cabinet space
- Check the supply valve condition (seized or corroded valves are replaced at the same time)
- Inspect the drain connection and confirm it is looped correctly to prevent backflow
- Slide in the new unit, connect water supply using a braided stainless steel hose
- Connect the drain to the sink drain tailpiece or garbage disposal inlet
- Make the electrical connection (hardwired or corded depending on the model)
- Level the unit in the cabinet opening and secure to the countertop per manufacturer specifications (note: we do not drill into granite, quartz, or stone countertops)
- Run the dishwasher through a full cycle while checking all connections for leaks
Total time for a standard replacement with no complications: 1 to 2 hours.
Installing a Dishwasher Where There Was None Before
Adding a dishwasher to a kitchen that has never had one involves more work than a simple swap. Requirements include:
Supply line: A hot water supply line must be extended from the kitchen sink supply and fitted with a new shutoff valve. In most Montreal kitchens this runs from the connections under the sink to the dishwasher position.
Drain connection: A drain hose from the dishwasher connects to either the garbage disposal inlet (if present) or a dedicated wye fitting on the sink drain tailpiece. The drain hose must be looped up to the underside of the counter before dropping down to the connection point. This high-loop or air-gap configuration prevents drain water from siphoning back into the dishwasher.
Electrical: A dishwasher requires a dedicated 15 or 20-amp circuit. If one does not exist, an electrician is needed before our work begins. We can advise on sequencing if you are coordinating both trades.
Cabinet space: A standard dishwasher requires a 24-inch-wide, 34.5-inch-high, 24-inch-deep opening. If the cabinet opening needs to be modified, this is typically done before we arrive.
We assess all of these requirements during an on-site evaluation and give you a clear scope and price before any work begins.
Get a quote Click to callDishwasher Installation in Montreal Condos and Multi-Unit Buildings
This is a category that appliance retailers often cannot handle. Condos and multi-unit buildings in Montreal have specific requirements that make a licensed plumber necessary rather than optional.
Building shutoff coordination. In some Montreal condo buildings, the unit-level hot water shutoff is not easily accessible, and shutting off water for the installation may require coordinating with building management or using the building's main supply valve. We have experience navigating these situations and can communicate directly with building management when needed.
Documentation for condo boards. Many condo associations in Montreal require that plumbing work be performed by a licensed contractor and that documentation be provided before work begins or after completion. We provide a written record of the work performed, confirmation of our RBQ license, and insurance documentation on request.
Drain stack connections. In some older Montreal multi-unit buildings, the kitchen drain connects directly to a shared vertical stack rather than to a P-trap under the sink. Connecting a dishwasher drain to this type of configuration requires a specific approach to prevent drain backflow and sewer gas from entering the unit. We have handled this in Plateau triplexes, Rosemont duplexes, and downtown condo towers.
What We Include as Standard
On every dishwasher installation we:
- Replace the supply shutoff valve if it is seized, corroded, or more than 10 years old
- Use braided stainless steel supply hose (not rubber or PVC)
- Confirm correct drain high-loop or air-gap configuration
- Level the unit in the cabinet opening
- Run a full cycle before leaving to confirm no leaks at any connection
- Remove and dispose of the old unit on replacement jobs (confirm at booking)
Dishwasher Types We Install
We install all built-in dishwasher configurations:
Standard built-in (under-counter): The most common type in Montreal homes and condos. Fits in a standard 24-inch cabinet opening.
Panel-ready dishwashers: The dishwasher front accepts a custom panel that matches the surrounding cabinetry. Installation requires careful alignment so the panel sits flush with adjacent cabinet doors. We take the time to get this right.
Compact dishwashers (18-inch): Smaller units for apartments, condos, and kitchens with limited space. Supply, drain, and electrical requirements are the same as standard units.
Countertop and portable dishwashers: These connect to a faucet aerator adapter rather than a dedicated supply line. We can install the faucet adapter and confirm drain connection if the unit drains into the sink.
Get a quote Click to callHard Water Considerations in Montreal
Montreal's moderately hard water affects dishwasher performance and longevity over time. A few notes:
The hot water supply to the dishwasher should come from the kitchen hot water line, not a cold line. Some older Montreal kitchens were plumbed with the dishwasher supply tapping off the cold water line, which increases cycle time and reduces cleaning performance.
Hard water causes scale buildup on the heating element, spray arms, and interior surfaces over time. Using a dishwasher-specific descaling product every few months extends the life of the unit and maintains wash performance.
If your previous dishwasher developed mineral staining on the interior in the first year or two, a water softener under the sink may be worth considering.
Why Choose Plomberie 5 Etoiles for Dishwasher Installation
RBQ licensed, which matters in condos and multi-unit buildings. Big-box retailer installation services explicitly exclude condos and multi-unit buildings that require a licensed plumber. We handle these regularly.
We check the supply valve on every job. A seized shut-off valve found during a dishwasher installation is replaced the same day. Finding it then is better than finding it during a future emergency.
Braided stainless steel supply hose as standard. Rubber supply hoses fail. We do not use them.
Full-cycle test before we leave. We run a complete cycle and verify no leaks at any connection before packing up.
15 years in Montreal homes. We have installed dishwashers in Plateau triplexes where the drain connects to a cast iron stack, Griffintown condos with restricted access panels, NDG bungalows adding a dishwasher for the first time, and South Shore homes replacing units after renovation. We know what to expect in each type of property.
CAA-Quebec recommended for 10+ years. 4.8 stars on Google. RBQ #5663-4538-01. CMMTQ Member.
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Serving Montreal, Laval, the South Shore, the North Shore, and the West Island.
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