What size concrete pad do I need at the base of my deck stairs for the BC Building Code?

The BC Building Code requires a concrete landing pad at the base of deck stairs that is at least as wide as the stair width and extends a minimum of 600mm (24 inches) beyond the bottom step. For most residential deck stairs, this means a concrete pad that's typically 4 feet wide by 3-4 feet deep and 4-6 inches thick.

Specific BC Building Code Requirements for Stair Landings:

The landing must be level and provide a stable transition from the stairs to grade. The 600mm extension beyond the bottom step ensures users have adequate space to safely step off the stairs without immediately encountering soft soil, gravel, or uneven ground. If your deck stairs are 36 inches wide (a common residential width), your concrete pad should be at least 36 inches wide by 36 inches deep (600mm + the depth of one tread, which is typically 280mm minimum).

The concrete pad must be properly reinforced and poured on a compacted gravel base to prevent settling and cracking. In Metro Vancouver's clay-heavy soils — especially common in Surrey, Richmond, and Delta — proper excavation and base preparation is critical. The pad should be sloped slightly away from the house (1-2% grade) to shed rainwater and prevent pooling against the foundation.

Metro Vancouver Climate Considerations:

Vancouver's 1,200mm+ annual rainfall makes proper drainage around stair landings essential. The concrete pad should be elevated slightly above surrounding grade to prevent water from pooling around the base of your stairs. Consider adding a French drain or gravel drainage strip around the perimeter if your lot has drainage challenges. Freeze-thaw damage is minimal in Vancouver's mild climate, but the concrete should still cure properly before the first significant rainfall.

Practical Installation Tips:

Most contractors pour stair landing pads as 4-inch thick reinforced concrete with 6x6 welded wire mesh or rebar grid. The excavation should extend 6-8 inches below the finished pad height to accommodate a 2-3 inch compacted gravel base plus the concrete thickness. For elevated decks with longer stair runs, you may need intermediate landings every 12 feet of vertical rise — each requiring its own properly sized concrete pad.

When to Hire a Professional:

While a simple stair landing pad might seem like a DIY project, concrete work requires proper mixing, finishing, and timing — especially during Vancouver's wet season. Professional contractors ensure proper reinforcement, drainage, and code compliance. Most deck contractors include the stair landing pad in their overall project quote, typically adding $300-800 depending on size and site access. If you're building the deck yourself, hire a concrete contractor for the landing pad — it's the foundation of safe stair access and worth doing right the first time.

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