How much does it cost to fix a sinking or uneven patio in Ottawa?

Sinking and uneven patios are one of the most common outdoor issues Ottawa homeowners face, and the root cause is almost always our extreme freeze-thaw cycle. With 50 or more freeze-thaw events each winter and frost penetrating 1.2 to 1.5 metres deep, even well-installed patios can shift over time. The repair cost depends entirely on the patio material, the severity of the settling, and which correction method makes sense for your situation.

For interlocking stone or paver patios, relevelling typically costs between $800 and $3,500. The process involves lifting the affected pavers, regrading the base material, compacting it properly, and resetting the stones. A small section of 50 to 100 square feet with minor settling might run $800 to $1,500, while a full patio relevel of 200 to 400 square feet with significant grade issues usually falls between $2,000 and $3,500. The base work is where the real cost lives — if the original installer skimped on granular base depth (Ottawa patios need a minimum 8 to 12 inches of compacted granular A base to resist frost heave), your contractor may recommend excavating deeper and rebuilding the base properly, which can push costs to $4,000 to $6,000 for a complete base reconstruction.

Concrete slab patios have different repair options at different price points. Mudjacking, which pumps a cement slurry beneath the slab to lift it back to level, costs between $500 and $1,500 for a typical Ottawa patio. Polyurethane foam injection (often called polyjacking) is the more modern approach, running $800 to $2,500, but the foam is lighter, more moisture-resistant, and cures in minutes rather than hours. Both methods work well for slabs that have sunk evenly, but if your concrete has cracked into multiple pieces from frost heave, lifting individual sections rarely produces a satisfactory result and replacement becomes the better investment.

Full concrete patio replacement in Ottawa runs $12 to $22 per square foot including demolition and disposal of the old slab, proper base preparation, and new concrete with appropriate control joints. For a 200 square foot patio, that translates to roughly $2,400 to $4,400. Adding rebar or wire mesh reinforcement — which is strongly recommended for Ottawa's ground movement — adds $1.50 to $3.00 per square foot but dramatically reduces future cracking and heaving.

Natural stone patios like flagstone on a sand-set base are the easiest and least expensive to relevel because individual stones can be lifted and reset without specialized equipment. Budget $600 to $2,000 depending on the area involved. Flagstone on a mortar bed over concrete is more involved and typically costs $1,500 to $4,000 because the mortar joints need to be cut, stones lifted, the concrete substrate addressed, and everything reset with new mortar.

One cost factor specific to Ottawa is timing. Spring is peak season for patio repairs because winter damage becomes visible once the snow melts, and contractors are booking quickly through May and June. Scheduling your assessment in late March or early April often means better availability and sometimes better pricing. A local patio contractor can evaluate whether your sinking is an isolated settlement issue or a sign of deeper base failure that needs more comprehensive repair.

---

Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Luxe Painting and Renovations
• JC Carpentry
• Home Front Services
• Geerts Roofing Inc
• Elie The Carpet Guy Inc.