What is the standard countertop thickness?

The standard countertop thickness for most materials is 3cm (approximately 1.25 inches), offering durability and a high-end look without the need for support reinforcements.

What’s the difference between 2cm and 3cm countertops?

2cm countertops are thinner, lighter, and often require support underneath. 3cm options are thicker, more durable, and preferred for a premium, seamless look.

Is a mitered edge thicker?

Yes. Mitered edges create the illusion of extra-thick countertops by wrapping the edge with a seamless vertical piece of stone. It’s ideal for modern and waterfall edge designs.

Countertop Thickness Guide: Standard, Mitered & Custom Options

Choosing the right countertop thickness isn’t just a design decision — it affects your budget, structural support, and overall aesthetic. Whether you’re remodeling a kitchen, upgrading a bathroom, or building an outdoor grill island, it pays to understand your options.

A side-by-side comparison of 2cm and 3cm countertop thickness on a quartz installation by Stone Valley Countertops.

Standard Countertop Thickness

In most homes across Ontario, the standard thickness for stone countertops is:

3cm (1.25 inches): Ideal for granite, quartz, and quartzite. Offers maximum strength and doesn’t require plywood support underneath.
2cm (0.75 inches): Used more in vanities or modern designs. Lighter but may need additional support or build-up underneath.

Not sure which one to go with? Our post on Quartz Countertops covers more on thickness benefits and edge options.

When to Choose a Mitered Edge

If you’re after a **bold, modern look**, a mitered edge might be for you. A mitered edge gives the illusion of a thicker slab (up to 6cm or more) by wrapping the stone vertically at the edge. It’s especially popular for:

Waterfall kitchen islands
High-end bathroom vanities
Outdoor kitchens and bars

Explore more edge designs in our Countertop Edge Profile Guide.

How Material Affects Thickness

Each stone behaves differently depending on its density. Here’s what to expect:

Granite: Most stable at 3cm; naturally heavy and durable.
Quartz: Works well in 2cm or 3cm; more flexibility in design.
Porcelain & ultra-compact surfaces: Often thinner (12mm) but mitered to appear thicker.

Design Trends in Thickness (2025)

According to our 2025 Countertop Trends Report, we’re seeing more designers opt for:

Thicker mitered edges (5–6cm appearance)
Integrated backsplashes with the same slab
Mixed thickness in the same space (ex: thick island, slim perimeter)

Custom Thickness Options

Some homeowners want something in between or totally custom. We can create **build-ups, laminated edges, and layered installations** that give you the look you want without compromising structural integrity.

Need help choosing the best approach? We’ll walk you through it based on material, budget, and design vision.

Final Thoughts

The right countertop thickness comes down to **function, material, and style goals**. Whether you’re sticking with standard 3cm or going bold with a mitered waterfall edge, we’ll help you make the right call for your space.

Use our quick estimate tool or book a consultation to get expert advice and see full-size thickness samples in person.