Interlock pavers and slabs in Toronto and the GTA

Take a soil bed. Add a properly compacted aggregate base. Lay paver units on top with sanded joints. The result is a hard, drained, durable surface that handles cars, foot traffic, and Toronto winters without cracking the way poured concrete does. That’s interlock paving in one paragraph.

Our crew handles installing interlock across the GTA: concrete pavers, slabs, natural stone, paving stones in any of the standard formats. Driveways, patios, walkways, pool surrounds, commercial entrances. The same base technique covers all of them.

Why interlock outlasts poured concrete

Poured concrete is one continuous slab. Toronto’s 50-70 freeze-thaw cycles a winter (Ho and Gough, Theoretical and Applied Climatology, 2006) chew it apart in 15-25 years.

Interlock is different. Each paver is its own unit. Sand-filled joints flex as the ground moves and as freeze-thaw shifts the bedding. Movement that cracks a slab just resettles a paver. The same surrounding area that destroys a poured driveway in two decades barely touches a properly installed interlock one.

Done right, an interlock installation lasts 25 to 50 years before it wants major work. Most maintenance is re-leveling a few settled pavers. That’s the durability advantage.

What we install

Concrete pavers do most of the work. Brampton Brick, Permacon, Unilock, Techo-Bloc all make solid product for GTA conditions. Brand choice mostly comes down to local availability and the look the homeowner wants.

Natural stone pavers are the upgrade. Flagstone. Indiana limestone. Owen Sound sandstone. Granite. Costs more per square foot. Takes longer to install (matching, fitting, hand-cutting). Lasts indefinitely once it’s in. Ages into a patina concrete can’t fake.

Slabs are the third category. Anything 24×24 inches or larger. Cleaner contemporary look. Faster installation per square foot. Stricter base requirement because each slab handles more load before joint sand can absorb movement.

Paving stones in any of these formats install on the same base, with the same edge restraints. Sourcing changes; technique mostly doesn’t.

The base does the work

The visible part of any interlock installation is the surface. The work that makes it last sits underneath.

Toronto driveway base: 8-12 inches of compacted Granular A or B aggregate. Soil type and load drive the depth. Patios and walkways go thinner, often 4-6 inches. Compaction happens in lifts of no more than 4 inches at a time. Lower layers have to actually achieve density, not just look compacted.

Geotextile fabric goes between subsoil and aggregate. Stops fines from migrating up over time.

Skip the base, the pavers settle. Compact it wrong, the pavers settle. Bad bases turn into tear-outs three to five winters later.

Drainage, edge restraints, erosion

Drainage is the second most common point of failure. Toronto stormwater bylaws now require new driveway installations to manage runoff on-site where feasible. Pitched grading toward a gravel infiltration zone or a city catch basin handles most homes. Interlock surfaces drain better than concrete naturally because joint sand passes water, but the sub-base still needs proper grade.

Edge restraints hold the perimeter pavers in place. Without them, the outermost row migrates outward over freeze-thaw seasons and the whole field starts to spread. Plastic, aluminum, concrete edges all work; the choice depends on what gets buried below grade.

Erosion control around landscape paving (slope grading, swales, drains) is part of the same conversation. Done right, the patio drains itself; done wrong, it pools after rain and undermines the base from underneath.

Costs and what changes them

GTA pricing for interlock paving falls in tight bands.

Concrete pavers: $20-35/sq ft installed for standard, $30-45/sq ft for premium (Unilock Series, Techo-Bloc large-format).

Natural stone: $35-65/sq ft installed depending on stone and cut.

Slabs: $25-50/sq ft installed.

Driveway pricing tends to sit at the high end of these because of base depth and load. Walkways and patios run lower per square foot.

Removal of an existing concrete or asphalt driveway adds $3-7/sq ft. Heavy regrading or drainage work (a French drain, for example) is a separate line item.

Pavers are low maintenance compared to almost any other outdoor surface. Joint-sand top-up every few years. Re-level on the rare settled paver. No resealing needed on most product. The eco-friendly side is real too: interlock stones absorb rain through their joints rather than dumping it into the storm system. We do see homeowners overspending on premium when basic interlock would do the job, so installing interlock means matching the product to use case at the site visit.

Service areas and getting started

Where we work: Toronto, Etobicoke, North York, Scarborough, Mississauga, Markham, Richmond Hill. Anywhere in the GTA, basically.

Most residential installs take 1 to 4 days on site. Standard driveway or patio. Bigger jobs or deeper bases obviously add time.

The first visit covers design, soil and grade check, drainage assessment, and material selection. We bring sample pavers and slabs to the property so colour and texture get checked against the actual house, not against a showroom backdrop where the lighting lies.

If you have a settling concrete driveway, asphalt that’s spalling at the edges, or a patio you want added before summer, book a site visit. Warm-season schedules run 4 to 8 weeks ahead. Spring inquiries fit best for May-through-October work.