When a property has a grade change that needs stairs, the staircase becomes a structural element. It holds soil, carries load, and must drain. Oshawa Concrete designs and builds multi-flight staircases to engineered specifications, whether they bridge a steep yard or exit a walkout basement. Free written estimate.
Why Staircase Construction Differs from Simple Steps
A front entry step connects a door to a walkway. A staircase connects two different elevations across a slope, often retaining soil on both sides and spanning multiple flights with landings. The structural demands are fundamentally different.
When a staircase cuts through a yard slope, it becomes a retaining structure. The concrete slab itself holds back the earth on either side. Walkout-basement stairs face the same challenge: they cut from the basement door up to grade and must retain the exposed soil. Both scenarios require proper footings, reinforcement strategy, and a drainage system that prevents water from pooling on the stair or running down the treads.
We measure the elevation change, identify where the staircase lands at top and bottom, and work with an engineer to set the rise, run, and landing geometry. The design accounts for the slope the staircase cuts through and any soil retention needed.
Build retaining walls
If the staircase cuts through a slope, we build retaining walls on either side using poured concrete, block, or both, per the engineered plan. These walls prevent the cut from sloughing back into the staircase area.
Form and reinforce flights
Each flight is formed to the correct rise and run. Rebar is tied throughout the slab, landings are formed, and any handrail anchors or embeds are set in place before the pour.
Pour and cure in sequence
The staircase is poured in the engineered sequence, often with multiple pours to allow proper cure time between flights. Each section is finished to a winter-grip surface and allowed to cure fully before the next phase.
Install drainage and test
Landings are sloped to shed water to a low point, which is tied to the property drainage or daylighted. The entire system is tested with water to confirm meltwater leaves the stair cleanly.
Staircase as structure
Multi-Flight Staircases Require Civil Engineering
A staircase is not just a series of steps. It is a small civil structure that must be designed before concrete is ordered. The load it carries, the slope it cuts, the soil it retains, and the water it must shed all factor into the design. We work from engineered drawings on every project.
Engineered design, walkout stairs, retaining the cut, drainage and landings.
For anything with multiple flights or any retaining role, yes. The geometry, the loads and the slope all need design rather than rule-of-thumb. We work from the engineer's drawings on every project and the cost of design is in the quote.
Yes; walkout-basement stairs are one of the most common uses for residential staircase construction. The stair runs from the walkout door up to yard grade, retains the cut on either side, and drains away from the door.
Code requires a landing after a certain number of risers, and good design uses landings whenever a flight gets long enough to feel unsafe. We design landings in where they belong rather than forcing one long flight.
Landings are sloped slightly to shed water to one side; the low point of the whole staircase is tied to the property drainage or daylighted. Done right, meltwater leaves the stair instead of running down it.
Several weeks for a typical residential staircase, because engineering, retaining, multiple pours and cure time stack up. The full schedule is in the written quote so you can plan around it.
Walkout-basement staircase, two flights with a landing, engineered drawings followed exactly. Drains the way it was designed to, no puddles. Worth the project.
Z. T.
Oshawa
★★★★★
Yard staircase down a steep slope, retained both sides as it descended. Cut through the slope without sloughing once. Real civil work, real quality.
Z. H.
Toronto
★★★★★
Engineer worked directly with their crew. Communication was tight, the build followed the drawing exactly, and the staircase has held perfectly through three winters.
Y. C.
Brampton
★★★★★
They were clear that staircases are not just steps; engineered, retained, drained. The quote reflected the scope and the build matched the quote. Honest from end to end.
Q. G.
Mississauga
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Describe the grade change, the top and bottom landing elevations, and any existing engineer involvement, and we will assess the site and send a written quote within one business day.
