# Ontario Driveway and Interlock Guide 2026 - Costs, Permits and Drainage Requirements **URL:** \ **Category:** Ontario\ **Tags:** patio, permits, interlock, concrete, homeowners, spring-2026\ **Created:** [April 26, 2026, 8:02pm UTC](https://home.renovation.reviews/t/ontario-driveway-and-interlock-guide-2026-costs-permits-and-drainage-requirements/46955 "2026-04-26T20:02:13Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![BuildersLTD](https://home.renovation.reviews/user_avatar/home.renovation.reviews/buildersltd/32/14872_2.png) [@BuildersLTD](https://home.renovation.reviews/u/BuildersLTD)\ **Post date:** [April 28, 2026, 6:58pm UTC](https://home.renovation.reviews/t/ontario-driveway-and-interlock-guide-2026-costs-permits-and-drainage-requirements/46955/2 "2026-04-28T18:58:55Z")
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](https://home.renovation.reviews/t/the-12-inch-rule-why-most-toronto-interlock-patios-fail-by-spring/45841). 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. --- _[View the full topic](https://home.renovation.reviews/t/ontario-driveway-and-interlock-guide-2026-costs-permits-and-drainage-requirements/46955)._