How to Choose a Bathroom Sink Faucet (Holes, Height & Style)

Look underneath your sink or inside the vanity cabinet and count the holes in the sink deck or countertop. Most Canadian production home sinks come pre-drilled with either one hole or three holes. A single hole accepts a single-hole or single-handle faucet. Three holes accept either a centerset faucet (which covers all three holes with a single base plate) or a widespread faucet (which uses three separate pieces). If your sink has one hole and you want a widespread faucet - or vice versa - you need a new sink, not just a new faucet.

Some sinks come with one or two pre-drilled holes and one or two blanked-off knockouts - pre-formed thin spots in the sink material that can be knocked out to create additional holes if needed. Check whether your sink has any of these knockouts before concluding that your hole count is fixed. If knockouts are present and accessible, a plumber can create additional holes, giving you more faucet configuration options without replacing the sink entirely.

If your sink has three holes, measure the distance from the centre of the left hole to the centre of the right hole. This is the centre-to-centre spread, and it determines which faucet configuration fits. A spread of approximately 100mm (4 inches) indicates a centerset sink - the most common configuration in Canadian production homes built since the 1990s. A spread of 200mm (8 inches) or more indicates a widespread sink - more common in larger vanities, custom bathrooms, and older Canadian homes built before the centerset became the production standard.

This measurement is the one most frequently skipped - and the reason most faucet returns happen. A centerset faucet will not fit on a widespread sink because the base plate is too narrow to bridge the outer holes. A widespread faucet installed on a centerset sink will leave the outer holes uncovered, which looks unfinished and allows water into the cabinet below. Measure before you buy.

For most standard drop-in or undermount sinks, the shank length on a centerset or widespread faucet is sufficient for the standard ceramic or acrylic sink deck thickness of 15-25mm. However, two situations require you to measure deck thickness before buying: thick stone countertops (granite or quartz counters are commonly 30-40mm thick in Canadian renovations, which requires a faucet with an extended shank or a countertop-mount installation kit), and vessel sinks, where the faucet must clear the height of the basin above the counter.

For a vessel sink, measure from the top of your countertop to the inner rim of the vessel. The faucet spout must clear this height by at least 25mm and ideally reach the centre of the basin. Vessel faucet height is stated in the product specifications as the height from the deck to the spout outlet - match this number to your vessel clearance requirement before purchasing. A faucet that is 50mm too short will direct water into the side of the vessel rather than the basin centre, creating splash and making the sink difficult to use.

A single-handle faucet controls both hot and cold water from one lever or knob - typically a lever that rotates side-to-side for temperature and lifts or pushes for flow volume. A double-handle faucet separates the hot and cold controls into two independent handles, one on each side of the spout. The choice between them is partly aesthetic and partly practical - and the right answer depends on the bathroom context and who will be using the sink.

Spout height is the distance from the deck surface to the highest point of the faucet spout arc. This measurement determines two things: whether the faucet clears the sink basin sufficiently for comfortable hand washing, and how the faucet looks in proportion to the sink and vanity. A faucet that is too short will direct water into the front of the basin rather than the centre - you will splash the counter every time you wash your hands. A faucet that is too tall relative to a shallow sink will create too much water pressure drop and splash at the basin surface.

The general rule for a standard drop-in or undermount bathroom sink: the spout arc should clear the sink rim by at least 100mm (about 4 inches), and the water stream should land in the centre of the basin when the faucet is running at a normal flow rate. For a standard Canadian bathroom sink with a basin depth of 130-180mm, a low-arc faucet (100-150mm spout height) is proportionally correct. A high-arc faucet (180-250mm) reads as oversized on a standard bathroom sink - it is more at home on a large vessel or a double-bowl sink where the extra clearance is needed.

Every bathroom faucet sold in Canada must carry CSA B125.1 certification - this is not optional and is enforced at the retail level. CSA B125.1 sets the maximum flow rate for bathroom faucets at 8.3 litres per minute (L/min) at standard water pressure (414 kPa). Most Canadian-market faucets flow at 5.7-7.6 L/min at standard pressure, which comfortably meets the code limit and is adequate for normal bathroom use. If you are purchasing a faucet from a US retailer or an international online seller, confirm CSA certification explicitly - American faucets are certified to different standards (ANSI/NSF 61 and ASME A112.18.1) and may not meet Canadian code, which creates issues if the home is inspected or sold.

Beyond the minimum code requirement, some Canadian homeowners opt for WaterSense-equivalent faucets that flow at 5.7 L/min or less - particularly in municipalities with water restriction programmes or in homes with low well pressure. A lower-flow aerator (the screen at the tip of the spout) can be retrofitted to almost any existing faucet to reduce flow without replacing the entire unit - this is the most cost-effective water-saving upgrade available in a bathroom, at approximately $8-$15 CAD per aerator.

The cartridge is the internal valve mechanism that controls water flow and temperature. There are two primary types in the Canadian market. A ceramic disc cartridge uses two polished ceramic discs that rotate against each other to control flow - they are essentially frictionless, highly durable, and virtually drip-proof throughout their service life. A rubber washer cartridge (also called a compression cartridge) uses a rubber seat that is compressed against a valve seat to stop flow - it is the mechanism in older faucets and budget products, and it drips as the rubber seat wears, requiring periodic washer replacement. For any faucet you intend to use for more than two or three years, specify ceramic disc. It is the only cartridge type worth buying in 2026.

The body material is equally important and even more frequently misrepresented in product listings. A brass body faucet has a solid brass internal structure that is naturally corrosion-resistant and does not degrade in contact with Canadian water conditions. A zinc alloy (sometimes labelled "zamak") faucet body corrodes internally over time - the exterior finish may look intact while the body itself is failing, leading to leaks at joints and connections that are difficult and expensive to repair. Confirm brass body explicitly in the product specifications - the word "metal" in a product listing does not mean brass, and a price below $200 CAD almost always indicates a zinc alloy body.

The faucet finish must match every other metal surface in the bathroom - towel bars, toilet paper holder, robe hook, shower hardware, and any light fixture with a metal element. This is not a design preference - it is a design rule. Mismatched finishes in a bathroom read as an unintentional accumulation of different purchases rather than a cohesive renovation, regardless of the individual quality of each piece. The most common mistake: a matte black faucet with brushed nickel towel bars, or a brushed gold faucet with polished chrome toilet paper holder. Both look like errors.

For the handle shape, the three common options in the Canadian market are lever (a flat bar that lifts or pivots - the most common and accessible choice), cross (a four-spoked cross that rotates - suited to traditional and heritage bathrooms), and knob (a round or tapered knob that turns  b-ecoming less common in current renovations). Lever handles are the correct choice for most contemporary Canadian bathroom renovations - they read as current, work with the broadest range of design aesthetics, and are the most accessible handle style for users of all ages and ability levels.