Kitchen Undermount Sinks

Is an Undermount Sink Right for Your Kitchen?

An undermount sink is a fantastic choice if you want a clean, modern look for your favourite cooking space. Unlike styles that drop into the counter from above, this type of basin mounts completely flat underneath your countertop. This rimless design means there is no annoying plastic or metal lip sitting on top of your counter to catch dirt.

Wiping down your counter surfaces is also easier because you can sweep crumbs and spilled water straight into the basin. This practical design makes it a top choice for busy Canadian families who value a tidy home.

Choosing the Right Size and Material

Finding the right material for your new undermount kitchen sink depends on your cooking style and the look you want to achieve.
A stainless steel undermount sink is a classic option that looks great in almost any home. Stainless steel is highly durable, easy to wash, resists stains, and matches perfectly with modern kitchen appliances.

If you prefer a splash of colour, granite composite materials are also excellent options because they resist scratches and naturally absorb sound and vibrations, so they stay quiet while the water is running.

Fireclay sinks offer exceptional durability with a non-porous surface that easily resists scratches, stains, and heat. Their timeless aesthetic and smooth, easy-to-clean glaze make them a long-lasting, low-maintenance centerpieces for any kitchen.

• Stainless Steel: Bright, classic look that resists heat and matches your appliances easily.
• Granite Composite: Quiet, modern finish that hides scratches and comes in deep earth tones.
• Fireclay: Smooth, high-gloss surface that brings a beautiful farmhouse charm to your space.

At The Home Depot Canada, you can explore excellent options from top-tier brands:

We carry long-lasting Kohler undermount sinks that are famous for their tough enamelled cast-iron strength. You can also browse our collection of Blanco undermount sink options, which feature beautiful contemporary colours like charcoal grey, black, metallic silver, and soft white.

Finding the Right Sink Width Size for Your Kitchen Cabinets

While you can find compact prep models for small bars, a 33-inch width is the most popular undermount sink size for standard Canadian homes. A 33-inch layout gives you plenty of space to wash large baking sheets, rinse fresh vegetables, and soak heavy pots without running out of room on the counter. A standard 33-inch model usually requires a base cabinet that is at least 36 inches wide. This extra space ensures the basin rim clears the inside walls of the cabinet frame perfectly.

Tips for Installing Undermount Sink Hardware

Taking your time while installing undermount sink basins ensures everything stays dry and secure for years to come. Because these basins hang beneath heavy stone or quartz counters, you must follow the proper steps for safely supporting undermount sink weight. First, clean the top edge of the sink rim to remove any dust or manufacturing oils.

Next, wipe down both the top rim of the sink and the underside of the counter with rubbing alcohol. This removes any dust or grease so the seal stays tight. Run a steady line of 100% pure silicone sealant along the sink rim. This keeps water from leaking down into your wooden cabinets. Finally, attach heavy-duty sink clips evenly around the edges. These clips hold the sink flat against the counter while the silicone dries. For heavier models, make sure every clip is screwed securely into the underside of the countertop.

No matter what sink material, size or mounting option you’re looking for, you’re sure to find it at The Home Depot Canada, in-store or online.

Frequently Asked Questions

How do I know what size undermount sink to get for my kitchen cabinet?

To choose the right size, measure the exterior width of your sink base cabinet (the standard Canadian cabinet sizes are 30, 33, or 36 inches). As a general rule, your sink's overall exterior width should be at least 3 inches smaller than the exterior (nominal) width of your base cabinet. For example, a 33-inch cabinet safely houses up to a 30-inch sink. This allows roughly 1.5 inches of side clearance for mounting clips and frame support. Always verify the manufacturer's "Minimum Cabinet Size" spec sheet prior to cutting.

What's the difference between a single and double bowl undermount sink?

A single bowl sink offers one large, uninterrupted basin, making it ideal for soaking wide baking sheets, large stockpots, or Dutch ovens. A double bowl sink features a center divider that allows you to multitask—such as washing dishes on one side while prepping food or rinsing on the other. While double bowls were the traditional standard in Canadian homes, single bowl "workstation" sinks have become the top choice for modern kitchen renovations due to their versatility.

Why are some kitchen sinks sound-dampened?

Sound dampening reduces the metallic "clatter" of cutlery, running water, and garbage disposals, particularly on stainless steel sinks (especially lighter 18-gauge models). Manufacturers apply thick rubber pads and heavy spray undercoatings to the exterior underside of the basin to absorb vibrations. In Canada's variable climate, this undercoating also serves a vital secondary purpose: it prevents thermal condensation ("sink sweating") underneath your cabinet when running cold water during warm, humid summer months.

Do you need a professional to install an undermount sink?

It depends on your setup. While an intermediate DIYer can install an undermount sink, you will often want a professional involved for two main reasons:

1. Countertop Cutting: Undermount sinks require precise cutout and polished, raw edges on solid surface countertops (granite, quartz, marble). This requires specialized stone-cutting equipment.
2. Weight & Support: A sink filled with water and dishes can easily weigh over 100 lbs. If attached incorrectly with improper clips or adhesive, it can detach from the stone and drop into the cabinet.
   

Rule of Thumb: If the countertop cutout is already precut, polished, and ready to go, installing the sink yourself is a realistic DIY project using support brackets. If you are starting from scratch or retrofitting a new sink size into existing stone, hire a professional.

What is the best type of undermount sink glue to use?

For creating a watertight barrier, 100% pure silicone adhesive is the absolute best choice. While mechanical clips or support frames carry the weight of the sink, silicone remains flexible, adheres to stone and metal, and creates a waterproof seal to keep moisture from seeping through and rotting your cabinetry.

How many clips do I need for undermount sinks?

For a standard 33-inch undermount kitchen sink, you should plan to use between 4 and 10 sink clips for undermount sink fasteners. Space them out evenly along the front, back, and sides of the basin. This even spacing shares the weight safely, so the basin never sags.

Can a regular cabinet handle the weight of an undermount sink?

Yes, most standard kitchen cabinets are strong enough to hold a normal basin. However, if you choose a very heavy material like cast iron or natural stone, you may need to build a simple wooden support frame inside the cabinet base to help hold the extra weight safely.