Ontario Driveway and Interlock Guide 2026 - Costs, Permits and Drainage Requirements

Canada Ontario
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Driveways and interlock projects are among the most popular exterior upgrades in the GTA. This guide covers material options, stormwater management obligations, base construction requirements, and 2026 contractor cost ranges.

Permit Requirements

Most driveway resurfacing does not require a building permit. However, widening in the front yard is subject to zoning bylaw lot coverage limits — in Toronto, maximum 50% of front yard can be hard surface.

Stormwater: Ontario municipalities increasingly require driveway projects to demonstrate no net increase in runoff. Permeable interlock systems are preferred or required for larger areas in many GTA municipalities.

Material Options and Costs (GTA 2026)

  • Asphalt: $8-$14/sq ft installed. 15-25 year lifespan with regular sealing.
  • Concrete: $12-$20/sq ft installed. 30+ year lifespan. Stamped or exposed aggregate adds $3-$6/sq ft.
  • Standard concrete interlock: $18-$28/sq ft installed. Individual pavers are replaceable.
  • Premium interlock (natural stone, large-format): $30-$60/sq ft installed.
  • Permeable interlock: $22-$35/sq ft. Allows water infiltration into base.

Proper Base Construction for Ontario Climate

Critical in Ontario freeze-thaw conditions. Minimum base: 150mm compacted granular A (standard driveways), 200-300mm for heavy vehicles. Geotextile fabric below base. Bedding sand: 25-40mm washed concrete sand (not stone dust, which retains moisture and promotes heaving).

Improper base is the single leading cause of interlock settling in the GTA. Always verify contractor base specs in writing before signing.

Full guide with contractor checklist: https://telegra.ph/Ontario-Driveway-and-Interlock-Guide-2026---Permits-Materials-and-Contractor-Costs-04-26

GTA Driveway Sealing Spring 2026: When to Seal, When to Skip, and Real Costs
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Strong baseline. Two field notes worth adding from the LF Builders side, since interlock and flagstone work are core to what we do across the GTA.

On base depth - the 12-inch compacted granular base the guide hints at is the single most-skipped step in driveway and walkway interlock failures we see. Spring 2026 has been brutal for jobs installed at 4-6 inches of base because the contractor priced for that. We covered the failure mode in detail here for anyone weighing quotes: The 12-inch rule: why most Toronto interlock patios fail by spring. Same physics applies to driveways and the heave is worse because of the load.

On stormwater - for any Toronto driveway over roughly 30 sq m of new hard surface, expect Toronto Water to look at runoff calcs even on a residential resurface. Permeable interlock (PICP) qualifies, but the bedding course has to be 4-8 mm angular open-graded stone, not standard limestone screenings. If your contractor lists screenings on the spec sheet for a permeable system, that is a red flag.

Pricing in the guide is on point for early 2026. Edge restraint is where we see contractors cut - spec the metal or concrete edge, never plastic on driveways. The polymeric sand at the joints needs to be re-applied around year 5 to 7, factor that into long-term cost, not just the install price.