How much would it cost to repair a sinking section of my driveway near the garage in Kanata?

Sinking or settling near the garage is one of the most common driveway problems in Kanata, and it is almost always related to how the driveway base was originally prepared where it meets the garage slab. Repair costs depend on the method and extent of the settlement.

Cost Ranges for Sinking Driveway Repair in Ottawa

• Polyurethane foam injection (mudjacking alternative): $800–$2,500 for a typical settled area near the garage. Foam is injected through small holes drilled in the asphalt, expanding underneath to lift the surface back to grade. This is the least invasive option and can be done in a few hours.
• Cut-and-patch reconstruction: $1,500–$4,000 depending on the area. The contractor sawcuts around the sunk section, removes the asphalt, excavates the failed base, recompacts with fresh Granular A, and repaves. This is the most durable repair.
• Full apron replacement (garage to sidewalk): $3,000–$7,000 if the settling extends across the full width of the driveway apron. In many Kanata subdivisions built in the 1980s–2000s, the entire transition zone from garage to driveway has settled.

During home construction, the area directly in front of the garage foundation is backfilled after the foundation walls are poured. This backfill — often a mix of excavated soil, clay, and construction debris — is rarely compacted to the same standard as undisturbed ground. Over 10–20 Ottawa winters, this loosely compacted fill settles under the weight of vehicles and the repeated freeze-thaw action of our climate.

In Kanata specifically, many subdivisions were built on former farmland with variable soil conditions. Some areas have pockets of organic material or soft clay that compress over time. The frost line at 1.2–1.5 metres deep in Ottawa means this settlement is amplified by ice lens formation each winter.

Which Repair Method Is Best?

Foam injection works well when the asphalt surface is still in good condition but has simply dropped. The surface needs to be free of alligator cracking and the base must not have washed away entirely — just settled. It is fast, minimally disruptive, and avoids the cold joint you get with a cut-and-patch repair.

Cut-and-patch is the better choice when the asphalt over the sunk area is cracked, deteriorated, or when the base needs to be completely rebuilt. This is more common for older Kanata driveways where the original base was too thin or used unsuitable fill material.

The Garage Transition Detail

A common mistake is repairing the sinking without addressing the joint between the driveway and the garage slab. This transition should be sealed with a flexible caulk rated for Ottawa's temperature range (-40°C to +40°C). If water continues to seep between the driveway and garage floor, the base will wash out again and the settlement will return.

Drainage Consideration

The repaired grade must ensure water flows away from the garage, not toward it. The Ontario Building Code requires positive drainage away from all structures. If the settling has created a low spot that ponds water against your garage foundation, the repair must correct this grade — not just lift the surface back to where it was.

Use Ottawa Driveways to find a local contractor in Kanata who can assess whether your sinking is a base compaction issue, a drainage problem, or both, and recommend the right repair approach.

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• Justyn Rook Contracting
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• Dump n Dash Hauling