Decorative Garden & Seat Walls in Montreal
Low-profile garden walls, seat walls, and raised planter walls that add structure and visual interest without the engineering requirements of retaining walls.
Why this service
- Adds structure and depth to flat landscapes
- Natural stone and manufactured block options
- No structural engineering required under four feet
FAQ for this service
What is the difference between a decorative wall and a retaining wall?
A retaining wall holds back earth on a slope and must resist significant lateral soil pressure, which requires engineered bases, drainage systems, and geogrid reinforcement for walls over four feet. A decorative wall is freestanding or borders a raised bed with minimal earth load -- it serves an aesthetic and functional purpose like defining garden edges, providing seating, or framing planters. Decorative walls under four feet typically do not require engineering.
How tall can a decorative wall be without needing an engineer?
In most Quebec municipalities, walls under four feet (1.2 metres) that are not retaining a slope can be built without a structural engineer. If the wall is retaining earth on one side, even at a lower height, it functions as a retaining wall and different construction standards apply. We assess every project to determine whether engineering is needed based on the wall height, soil conditions, and what the wall is holding.
What materials work best for seat walls around a patio?
Manufactured concrete block with a smooth or textured cap stone is the most popular choice for seat walls because it offers consistent dimensions for comfortable seating height, a wide range of colors to match your patio pavers, and a clean finished look. Natural stone cap on a block core is a premium option that combines the warmth of real stone with the structural consistency of block. Seat walls are typically 18 to 20 inches high for comfortable sitting.
Do raised planter walls need drainage?
Yes. Without drainage, water accumulates in the enclosed soil volume and can freeze in winter, expanding against the wall faces and causing damage over time. We install weep holes or drainage gaps at the base of raised planter walls and line the interior with filter fabric to prevent soil from washing out through the drainage points. This keeps the soil at a healthy moisture level and protects the wall structure.
Can a decorative wall be built on an existing patio or lawn?
A decorative wall requires its own compacted granular base set below the topsoil line, so we excavate a footing trench even when building next to an existing patio. Building directly on top of patio pavers or turf would result in settling and movement. The footing trench is typically 12 to 18 inches wide and 8 to 12 inches deep, and we restore the surrounding patio or lawn after construction.
