How much does a retaining wall cost per linear foot in New Brunswick?

Retaining walls in New Brunswick cost $35 to $65 per square foot of wall face, which translates to roughly $70 to $260 per linear foot depending on the wall height. A 2-foot-tall wall costs approximately $70-$130 per linear foot, while a 4-foot wall runs $140-$260 per linear foot. For a typical 30-linear-foot residential retaining wall at 3 feet tall, expect to pay $3,150-$5,850 fully installed.

The price per square foot of face area is the most accurate way to compare quotes because it accounts for both wall length and height. Material choice is the biggest variable in pricing. Concrete retaining wall blocks (such as Allan Block, Versa-Lok, or Techo-Bloc) are the most common choice in New Brunswick, costing $20-$35 per square foot of face installed. Natural stone (fieldstone, armour stone, or granite) creates a premium look at $30-$50+ per square foot. Pressure-treated timber walls are the most affordable at $15-$25 per square foot but have a shorter lifespan (15-20 years versus 50+ for concrete or stone) and are increasingly falling out of favour.

Base preparation is critical in New Brunswick and represents a significant portion of the cost. With frost depths of 1.2-1.5 metres, retaining wall footings must extend below the frost line to prevent heaving. The base typically requires excavating 18-24 inches below grade, installing 12-16 inches of compacted gravel base, and incorporating proper drainage — a perforated pipe in gravel behind the wall with filter fabric. Skipping or reducing the base depth is the most common cause of retaining wall failure in NB, and repairs typically cost more than doing it properly the first time.

Walls over 4 feet tall in New Brunswick enter a different cost category. Most municipalities require engineered designs for walls above 4 feet, and some (including Fredericton and Moncton) require a building permit. Engineering fees add $500-$2,000 to the project, and the wall itself requires geogrid reinforcement, heavier base preparation, and often larger block sizes — all of which push costs to $50-$80+ per square foot of face. For walls over 6 feet, consider terracing with two shorter walls, which can be more cost-effective and often eliminates the engineering requirement.

Site conditions across New Brunswick significantly impact pricing. Steep slopes require more excavation. Rocky soil (common in northern NB and Saint John) increases digging time and may require machinery. Clay-heavy soils in the Fredericton area need more attention to drainage behind the wall. Limited access for equipment (carrying materials through side yards) adds labour costs of $500-$1,500. Always get at least three detailed quotes that specify base depth, drainage method, and material brand, and ask to see completed walls that have survived at least two NB winters.

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