Ontario Building Codes May 2026

The Patels framed the compliance certificate and hung it by the door. Beside it, a photo of the Grand River at spring flood—a quiet reminder that in Ontario, codes are the only thing standing between a home and the deep.

Leo shrugged. “Grandma doesn’t like steps.” ontario building codes

Mira opened her binder to “Foundation drains must discharge to a storm sewer, daylight, or a sump with a backup pump. You’ve done none of these.” She also cited Section 9.7.1.1. on exterior grading, which demands that ground slope away from walls at a minimum of 2% for six metres. Leo’s site sloped toward the foundation. The Patels framed the compliance certificate and hung

The property sat just thirty meters from the Grand River. According to , specifically Section 9.13 – Dampproofing and Waterproofing and Section 9.14 – Drainage , any foundation within a designated flood fringe required a minimum elevation of 600 mm above the regulatory flood elevation. Leo didn’t check the local conservation authority’s floodplain maps. He poured a concrete slab at grade. “Grandma doesn’t like steps