How do I install fence panels between existing concrete retaining walls in a Vancouver hillside yard?

Installing fence panels between existing concrete retaining walls on a hillside is one of the more technically demanding residential fence projects you'll encounter — and in Metro Vancouver's wet climate and varied terrain, getting the details right is critical.

The core challenge is that you're anchoring into concrete rather than soil, which changes everything about how posts are set. You have two main approaches: surface-mounted post bases bolted into the top of the retaining wall, or core-drilled holes through the wall cap with posts set in epoxy or non-shrink grout. Which method works best depends on the wall's thickness, condition, and whether you have access to the back side.

Anchoring Methods Into Concrete Retaining Walls

Surface-mounted post bases are the most common approach for residential projects. Heavy-duty standoff post bases (Simpson Strong-Tie ABA or similar) are bolted to the top of the retaining wall using wedge anchors or sleeve anchors drilled into the concrete. You'll need a hammer drill with a masonry bit, and the anchors must be sized correctly for the load — a 6 ft solid cedar privacy fence in a North Shore wind exposure needs a minimum 1/2 inch diameter anchor, embedded at least 3.5 inches into sound concrete. The post base raises the post slightly off the concrete surface, which is actually beneficial in Metro Vancouver's wet climate because it prevents water from pooling at the post base and accelerating rot.

Core-drilled posts involve drilling a hole through the wall cap (typically 4-6 inches deep) and setting the post directly into the void with non-shrink hydraulic grout or two-part epoxy anchoring compound. This method provides excellent rigidity and is preferred when the wall cap is thick enough to provide real embedment. However, it requires a core drill or rotary hammer with a large-diameter bit, and you must be careful not to compromise the structural integrity of the wall — particularly near edges or existing cracks.

Never drill into a retaining wall without understanding its construction. Older concrete walls in Vancouver hillside properties sometimes have rebar near the surface, drainage weep holes that must not be blocked, or hidden voids. If the wall is showing signs of movement, cracking, or water seepage, have a structural engineer assess it before adding any fence load to it.

Dealing With the Slope Between Walls

Hillside yards in Metro Vancouver — particularly in North Vancouver, West Vancouver, Coquitlam, and Burnaby — often have multiple retaining wall tiers at different elevations. The fence panels between walls need to address the grade change using one of two methods.

Stepped panels drop in flat, level sections with a vertical gap between each step. This is the cleaner look and easier to build, but the triangular gaps at the bottom of each step need to be addressed — either with a kick board cut to follow the slope, or with infill material like gravel or stone.

Racked panels angle the entire panel to follow the slope. This works well with certain fence styles (picket, shadowbox) but is very difficult to execute cleanly with horizontal slat designs, which require perfectly level rails for the modern look to work.

Metro Vancouver-Specific Considerations

The North Shore and hillside areas of Coquitlam and Burnaby get significantly more rainfall than the Fraser Valley floor — some North Shore locations exceed 2,000mm annually. Any wood fence installed between retaining walls in these locations should use Western Red Cedar with all cut ends treated with end-cut preservative, galvanized or stainless steel hardware throughout, and panel bottoms raised at least 2-3 inches above any surface below to prevent moisture wicking.

If the retaining walls are creating a contained area with limited drainage, standing water after heavy rain will dramatically shorten fence life. Ensure the base of the fence area has adequate drainage — gravel beds or a French drain — before installing panels.

Check with your municipality before starting. In the City of Vancouver, North Vancouver, and Burnaby, a fence on top of or adjacent to a retaining wall may trigger permit requirements depending on combined height. A 1.2 metre retaining wall with a 1.8 metre fence on top creates a combined 3 metre barrier, which almost certainly requires a building permit and may require engineer sign-off.

When to Hire a Professional

This is not a beginner DIY project. Drilling into concrete retaining walls, sizing anchors for wind load, managing stepped or racked panels on a slope, and ensuring the wall itself can handle the added lateral load all require experience and proper tools. A mistake here — a post anchor that pulls out in a windstorm, or a panel that traps water against the wall — is expensive and potentially dangerous.

Vancouver Fence Builders can match you with fence contractors who have specific experience with hillside and retaining wall installations across Metro Vancouver. Find local professionals through the Vancouver Construction Network at vancouverconstructionnetwork.com/directory?trade=fencing and get a free estimate on your project.