Natural Stone Supply in Toronto — Premium Stone for Every Project
Granite, limestone, slate, quartzite, and more — stocked at our North York showroom for contractors, builders, and developers across the GTA.
Natural Stone for Construction, Landscaping, and Architectural Projects in Toronto
Natural stone is a quarried, unprocessed building material used in construction, landscaping, and architectural applications. It includes granite, limestone, slate, quartzite, sandstone, and basalt. Grand Valley Building Supplies supplies natural stone to Toronto-area contractors and builders through 10 brand lines, including Polycor, Banas Stone, STONEArch, Muskoka Rock, and Ontario Limestone.
Used for thousands of years, natural stone is durable, weather-resistant, and versatile. Each piece is unique, shaped by geology, quarried, and processed for building.
For Toronto contractors and home builders, natural stone is ideal for exterior facades, cladding, retaining walls, interior feature walls, fireplace surrounds, landscape edging, pool coping, and custom detailing. The best stone depends on the application, climate, load, and visual goals.
Our North York showroom offers stone from 10 suppliers, with many species, finishes, and formats, including full blocks and slabs, as well as lightweight veneer panels for residential and commercial projects.
Stone Types We Carry
- Granite
- Slate
- Quartzite
- Sandstone
- Basalt
- Thin Veneer Stone
- Fieldstone / Muskoka Rock
- Limestone (incl. Ontario Limestone)
Natural Stone Brands Available at Grand Valley Building Supplies
Grand Valley carries 10 natural stone brand lines — each with distinct specializations in stone type, finish, format, and application. Browse by brand to find the right stone for your Toronto project.
STONEArch
A premium architectural stone line offering granite, quartzite, sandstone, and limestone in an extensive range of finishes — from flamed and sandblasted to natural and polished. Suited for high-end facade and feature wall applications.
Banas Stone
One of Ontario's leading natural stone distributors, Banas Stone offers a wide selection of granite, limestone, and slate products in slab, tile, and landscape formats — popular with Toronto custom home builders and landscaping contractors.
Polycor
North America's largest quarrier of natural stone, Polycor specializes in granite, limestone, marble, and quartzite quarried from Canadian and American deposits. Known for consistent quality and a broad colour and finish selection.
Muskoka Rock
Fieldstone and natural rock products sourced from Ontario's Muskoka region. Ideal for rustic and naturalistic applications: retaining walls, garden borders, fireplace surrounds, and landscape features that require an authentic, regional character.
Pangaea Stone
A diverse stone collection spanning quartzite, granite, limestone, and slate in multiple formats and finishes. Pangaea Stone products are available in both full-thickness and thin veneer formats, suitable for interior and exterior applications.
Erth Coverings
Lightweight natural stone and stone veneer panels engineered for interior and exterior wall cladding. Erth Coverings products are popular for feature walls, accent panels, and retrofit applications where structural weight is a constraint.
MSI
MSI (M S International) is a major North American surface and stone distributor, offering granite, quartzite, marble, and slate in tile, slab, and panel formats. Well-suited for interior stone applications and countertop specifications.
Ontario Limestone
Regional limestone products quarried in Ontario, known for their warm cream and buff tones that complement traditional and transitional architectural styles. Used extensively in Toronto-area residential construction for facades, steps, and coping.
Fond Du Lac
Quarried in Wisconsin, Fond Du Lac limestone is a dense, durable dolostone used in masonry, cladding, and landscape applications. Available in a variety of cut and natural-face finishes with characteristic grey-buff toning.
Thin Veneer Stone
Real natural stone processed to a reduced thickness (typically ¾" to 1¼") for use on surfaces that can't support full-weight masonry. Grand Valley stocks thin veneer from multiple suppliers — including Erth Coverings, Pangaea Stone, and MSI — for facade retrofit and interior feature wall applications.
What is Natural Stone Used for in Construction and Landscaping?
Natural stone is one of the most application-versatile building materials available. The right stone type and format depend on the structural, climatic, and aesthetic demands of each specific application.
- Application 1
Exterior Facades & Cladding
Natural stone cladding is applied to building exteriors for both structural and decorative purposes. Common choices include granite and quartzite for high-durability applications, limestone for traditional residential facades, and thin veneer stone for retrofit cladding projects where load reduction is required. Stone facades are highly resistant to Toronto's freeze-thaw climate cycles when properly installed.
- Application 2
Retaining Walls & Structural Masonry
Full-thickness natural stone — fieldstone, limestone, and granite — is widely used in retaining walls, garden walls, and structural masonry applications. Muskoka Rock and Ontario Limestone products are particularly common in GTA residential and municipal landscaping for natural-looking structural applications.
- Application 3
Landscape & Hardscape
Flagstone, pavers, and natural stone slabs are used in patios, walkways, pool surrounds, and garden features. Slate and quartzite are popular for flagging due to their flat, cleavable faces. Granite and limestone are common choices for pool coping and steps. Browse our Landscape & Hardscape collection for Toronto outdoor project materials.
- Application 4
Interior Feature Walls & Fireplaces
Natural stone and thin veneer products are used on interior accent walls, fireplace surrounds, and feature columns in residential and commercial spaces. Erth Coverings and Pangaea Stone panels are commonly specified for interior retrofit applications where weight and ease of installation are priorities.
- Application 5
Custom Stone Detailing
Sills, caps, corbels, keystones, and other architectural stone details require precision cutting and consistent material quality. Grand Valley's Custom Stone Detail services provide Toronto builders and architects with fabricated stone pieces for specific project requirements.
- Application 6
Countertops & Interior Surfaces
Granite, quartzite, and marble-family stones are widely specified for kitchen countertops, bathroom vanities, and commercial surfaces. MSI and Polycor offer slab formats suitable for countertop and flooring applications, available through Grand Valley's North York showroom.
Types of Natural Stone: Characteristics and Common Uses
Different stone types have distinct physical properties that determine their suitability for specific construction, landscaping, and interior applications. The following reference covers the most common natural stone types available through Grand Valley Building Supplies.
Stone Type
Key Characteristics
Common Applications
Granite
Igneous rock. Extremely hard (Mohs 6–7). High resistance to scratching, staining, and freeze-thaw cycling.
Exterior facades, countertops, flooring, coping, steps, retaining walls
Limestone
Sedimentary rock. Moderate hardness. Warm cream, buff, and grey tones. Easier to cut and detail than granite.
Facades, sills, caps, steps, cladding, and landscape edging
Slate
Metamorphic rock. Fine-grained, splits into flat sheets (cleavage). Good weather resistance.
Roofing, flooring, flagging, feature walls, pool surrounds
Quartzite
Metamorphic rock. Very hard and dense. Often compared to granite in durability. Naturally veined appearance.
Flooring, countertops, facade cladding, flagstone patios
Sandstone
Sedimentary rock. Softer than granite or quartzite. Warm tones — buff, brown, red.
Landscape edging, feature walls, decorative applications
Basalt
Dark igneous rock (grey to black). High density and compressive strength.
Pavers, coping, feature walls, and commercial flooring
Fieldstone / Muskoka Rock
Glacially rounded or split natural rock from Ontario’s Canadian Shield.
Retaining walls, garden walls, rustic landscape features
Limestone (Ontario)
Regional sedimentary limestone quarried in Ontario. Cream-to-buff tones match traditional Ontario architecture.
Facades, steps, sills, and landscape borders
Natural Stone — Common Questions
What is natural stone?
Natural stone is any stone material quarried directly from the earth, as opposed to manufactured or engineered stone products. It includes igneous rocks (granite, basalt), sedimentary rocks (limestone, sandstone), and metamorphic rocks (slate, quartzite, marble). Each stone type has distinct mineral compositions, hardness levels, textures, and colours determined by its geological formation. Natural stone is used in construction, landscaping, and interior design for its durability, visual character, and material authenticity.
What are the most durable types of natural stone for exterior use?
Granite and quartzite are considered the most durable natural stones for exterior use, being hard, dense, and resistant to weathering, freeze-thaw cycles, and abrasion—crucial in Toronto’s climate, where temperatures range from −20°C to +35°C. Limestone and slate, when sealed and installed correctly, are also durable for facades, steps, and landscaping. Sandstone, softer and more porous, is better for sheltered or decorative applications than high-traffic or exposed surfaces.
What is the difference between natural stone and manufactured stone veneer?
Natural stone is quarried from the earth and cut into building formats; it is authentic geological material. Manufactured stone veneer, or faux stone, is a concrete product molded and pigmented to look like natural stone. Natural stone offers authenticity, unique patterns, and durability. Manufactured stone is lighter, more uniform, and often cheaper but lacks the character and longevity of real stone. Thin veneer is a middle ground—real stone processed to a thinner form for lighter loads.
How is natural stone finished, and what do different finishes look like?
Natural stone is processed into a range of surface finishes, each with different aesthetic and functional characteristics:
- Polished: High-gloss surface achieved by grinding and buffing. Reveals the full colour depth of the stone. Best for interior use — polished surfaces can be slippery when wet.
- Honed: Matte or satin finish with no gloss. Smoother than raw stone. Used for flooring, countertops, and interior cladding.
- Flamed (Thermal): Produced by applying intense heat to the stone surface, causing crystals to fracture and creating a rough, non-slip texture. Common for exterior paving and facade applications.
- Sandblasted: Abrasive finish creating a uniform, fine texture. Often used on limestone and granite for facades and cladding.
- Natural / Split Face: Stone split along its natural cleavage plane, preserving the raw geological texture. Popular for rustic retaining walls and landscape features.
- Tumbled: Stone pieces rounded and surface-aged in a drum to create a worn, antique appearance. Used in tile and landscape applications.
Grand Valley’s natural stone collection is available across most of these finish types. Visit our showroom to see finish samples in person.
Does natural stone require sealing, and how often?
Sealing requirements for natural stone vary by type and use. Porous stones like limestone, sandstone, and some slates absorb moisture and stain easily, requiring sealing for outdoor use, countertops, and flooring. Denser stones such as granite and quartzite are less porous and might not always need sealing, but are advised in high-traffic or food-contact areas. Sealers should be reapplied every 1–5 years based on exposure. For Toronto’s climate, a penetrating sealer is preferred for exterior installations, providing protection without altering appearance and resisting freeze-thaw cycles. Always check your stone manufacturer’s guidelines or consult Grand Valley for specific sealing advice.
What is the difference between limestone and granite for a building facade?
Limestone and granite are popular building materials with different properties. Granite (Mohs 6–7) resists weathering, staining, and abrasion, ideal for high-exposure areas, while limestone (Mohs 3–4) is softer, easier to carve, and suited for architectural details. Limestone has a warmer, traditional look compared to granite’s crystalline appearance. In Toronto, both are suitable with proper installation and sealing; limestone needs regular sealing to protect against moisture and acid rain. Ontario Limestone is especially apt for local residential projects, offering a regional palette.
Ready to Specify Natural Stone for Your Toronto Project?
Visit our North York showroom to see stone samples in person, or contact our team for product availability, project specifications, and bulk supply pricing.