We’ve been installing interlock driveways across the GTA since 1967. The gap between a driveway that holds up through ten Ontario winters and one that’s wavy and pooling water after two has almost nothing to do with the pavers themselves. It comes down to what happens before the first paver goes down.
Why GTA driveways heave
The freeze-thaw cycle gets the blame, but the actual mechanism is insufficient base depth in frost-susceptible native clay soil. Frost penetrates a shallow base, moisture expands, and the pavers lift. By spring they settle back – but not perfectly level. Do that for two or three winters and you’ve got a wavy, water-pooling surface that’s structurally done.
In the GTA, where native soils are heavy clay, the base spec isn’t optional. Eight inches of Granular A is the minimum for a pedestrian pathway. A driveway taking vehicle loads needs 12–14 inches of compacted Granular A in lifts, plus 1 inch of bedding sand and the paver thickness on top. Total excavation: 14–18 inches below finished grade.
What separates a 10-year driveway from one that heaves by April
Almost all of it happens before any paver touches the ground. Excavation to 14–18 inches below grade. Native clay removed – not compacted in place. Granular A installed in 4–6 inch lifts, plate-compacted at each. Concrete or asphalt edge restraint pinned to the base rather than plastic spike anchors, which aren’t adequate under vehicle loads. Bedding sand screeded to exactly 1 inch – thicker builds in settling.
Most of the failed driveways we’ve seen went wrong on base depth and the compaction sequence. Contractors moving fast skip lift intervals. That’s the part you can’t evaluate from a quote.
The Toronto street work permit most homeowners don’t know about
Replacing an existing driveway within the same footprint generally doesn’t need a Toronto building permit. But if any work touches the boulevard, the curb cut, or anything in the city’s right-of-way, you need a Street Occupancy or Road Alteration Permit from Transportation Services.
New entrances, driveway widening, a second curb cut – all of it falls under the Road Alteration Permit, not a building permit. Miss it and the city can order you to restore the original curb cut at your cost.
Ask your contractor specifically who’s pulling this permit and where the cost sits. Some include it. A lot don’t mention it until you ask.
2026 GTA price ranges for interlock driveways
Based on projects across the GTA this spring:
- Standard-format paver (Holland stone, Plaza stone) on a proper deep base: $22–$30/sq ft installed
- Larger format, two-tone pattern, soldier course edging: $30–$42/sq ft
- Natural stone, complex pattern, significant grading: $42–$60+/sq ft
A two-car driveway (500–650 sq ft) runs $14,000–$39,000 depending on spec. Most of that range comes down to base depth, edge treatment, and pattern work.
Toronto landfill tipping fees are running around $160–$170/tonne this year. Full driveway removal and base replacement generates real disposal volume. If disposal isn’t showing up in your quote as a line item, ask where it’s sitting in the number.
What a complete interlock quote should specify
If these aren’t in the quote, there’s room to cut corners that won’t show up until year two or three:
- Excavation depth in inches below finished grade
- Base material spec (Granular A – not “crusher run” or unspecified granular)
- Number of compaction lifts and equipment type
- Edge restraint method (concrete haunching vs aluminum stake – the latter isn’t adequate for driveways)
- Permit responsibility – who pulls it, who pays for it
- Polymeric sand vs regular sand (polymeric holds longer, costs more upfront)
- Drainage – where does water exit at the garage apron and property edges?
What are you seeing?
If you’re in the quotes stage right now, this is a reasonable place to compare notes on what’s being specced. The permit question and disposal cost tend to be the things no one mentions until you specifically ask.
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