How do I fix a single sunken interlock paver in my Ottawa driveway without calling a contractor?

A single sunken interlock paver is typically caused by localized base settling and can be fixed by a capable homeowner with basic tools. You'll need to lift the paver, add bedding sand underneath, compact it properly, and relay the paver level with its neighbours.

Tools and materials you'll need: Two flat pry bars or large screwdrivers, coarse bedding sand (concrete sand works well), a hand tamper or rubber mallet, a level, and a broom. The repair should take 30 to 60 minutes depending on how settled the paver is.

Step-by-step repair process: First, carefully lift the sunken paver using flat pry bars inserted along opposite edges — work slowly to avoid chipping the paver or disturbing adjacent ones. Once removed, you'll likely see a depression in the bedding sand beneath. Add coarse bedding sand to fill the low spot, then compact it firmly with a hand tamper or the handle of your rubber mallet. The goal is to create a firm, level base that sits about 10mm higher than the final desired height to account for settling when you replace the paver.

Test-fit and adjust: Place the paver back in position and check that it sits level with surrounding pavers using a small level or straight board. The paver should be flush with its neighbours — not high or low. If it's still too low, remove it again and add more sand. If it's too high, remove some sand and re-compact. This trial-and-error process is normal and ensures a proper repair.

Ottawa-specific considerations: Single paver settling often occurs after Ottawa's freeze-thaw cycles, particularly in spring when the ground is saturated from snowmelt. If you notice multiple pavers settling in the same area, or if this same paver keeps sinking after repair, you likely have a larger base stability issue that requires professional attention. Ottawa's clay soils can create localized soft spots that cause recurring settlement.

When to call a professional: If you find three or more pavers settled in the same general area, if the base material beneath appears to be missing or washed away, or if you discover that the paver has cracked during settling, you're dealing with a more significant base failure that requires proper excavation and re-compaction. Also, if the sunken area is near your driveway's edge where snowplow damage is common, a contractor should assess whether edge restraints need reinforcement.

This is one of the more straightforward interlock repairs that most Ottawa homeowners can handle successfully, and it's good practice for understanding how your driveway is constructed.