Do I need a permit for a concrete patio in Saint John NB?

In most cases, a concrete patio in Saint John does NOT require a building permit — provided it is at grade level, not attached to the house as a structural element, and within the allowed setbacks from property lines. However, there are specific situations that do trigger permit requirements, so it is worth understanding the distinctions before you pour.

The City of Saint John's building bylaw, like most NB municipalities, exempts straightforward concrete flatwork patios from the permit process. A ground-level patio that is essentially a finished concrete slab, even a large one at 400-600 square feet, is treated similarly to a gravel pad or interlocking stone surface — it is a landscape improvement, not a structure requiring inspection. This makes concrete patios one of the more homeowner-friendly permit-exempt improvements you can make to your Saint John property.

The exceptions are worth knowing. If your patio involves any of the following, permit requirements may apply: a deck-like platform elevated more than 600 mm (24 inches) above grade, which is unusual for a ground-level patio but could occur on sloped lots common in Saint John's hilly terrain; structural columns or piers integrated into the patio; a roof or pergola structure attached to your home; or retaining walls over 4 feet required to create a level patio surface on a sloped lot. For these situations, contact the City of Saint John Building Inspections department to confirm what approvals are needed.

Setback requirements still apply to permit-exempt patios. In Saint John residential zones, typical minimum setbacks are 1.2-2 metres from side and rear property lines, though your specific zone may vary. Confirm your setbacks with the city before you finalize the patio layout — a patio poured over a property line is a problem regardless of permit status.

For the patio itself, Saint John's coastal climate demands careful concrete specification. The Bay of Fundy brings significant salt air and moisture to Saint John, and with 150+ annual freeze-thaw cycles, a non-air-entrained concrete mix will fail within a few years. Specify air-entrained concrete (25-32 MPa, 4-7% air content) for your patio, use a 4-inch minimum slab thickness (5 inches on any surface that might see vehicles), include wire mesh or rebar on chairs at mid-slab height, cut control joints every 8-10 feet, and apply a quality penetrating sealer within 30 days of the pour.

For a standard broom-finish patio in Saint John, budget $2,500-$7,000 for a 200-400 square foot installation, or $10-$18 per square foot fully installed. Stamped concrete patios run $12-$20 per square foot. New Brunswick Concrete can match you with local Saint John area concrete contractors for a free estimate.