How much does it cost to install a whole-house generator pad next to my garage in Ottawa?

A concrete generator pad installation in Ottawa typically costs $800 to $2,500, depending on the size of your generator, site conditions, and whether you need electrical or gas connections run to the location. The concrete work itself — a properly reinforced 4-inch thick pad with footings below the frost line — usually runs $15 to $25 per square foot installed.

In Ottawa's climate, the generator pad foundation is critical because our 1.2 to 1.5 metre frost depth means any concrete work must be engineered to prevent heaving during freeze-thaw cycles. A typical whole-house generator requires a pad that's 5x3 feet to 6x4 feet depending on the unit size, but the footings around the perimeter must extend well below the frost line. Many contractors will excavate 18 inches deep, pour footings, then build up to create a level pad that sits slightly above grade for proper drainage.

The location next to your garage offers some advantages — you're likely close to your electrical panel for connection, and the proximity may simplify trenching for gas lines if you're installing a natural gas unit. However, you'll need to maintain proper clearances from the garage structure, windows, and any air intakes. The generator also needs to be positioned where exhaust won't accumulate near the garage or house, and where snow won't block air intake or exhaust vents during Ottawa winters.

Additional costs to consider include electrical connection by an ESA-licensed electrician ($1,500 to $4,000 depending on distance from your panel and transfer switch requirements), natural gas line extension if needed ($800 to $2,500), and the generator unit itself ($4,000 to $15,000 depending on size). Site preparation can add costs if excavation reveals challenging soil conditions or if significant grading is needed for proper drainage away from both the generator and your garage foundation.

The timing matters in Ottawa — concrete pours should be scheduled for temperatures above 5°C, and the concrete needs several days to cure properly before heavy equipment is placed on it. Most generator installations happen between May and October when weather conditions are favorable for both concrete work and electrical connections.