One winter later, the bottom step feels taller. The stair has not necessarily grown. The ground beside it may have moved.
Record which part changed
Compare dated photographs of the landing, stringers, and nearby grade. Note rocking pavers, visible gaps, and whether the change reverses seasonally. Do not adjust the stair yourself to match one temporary position.
Simpson Strong-Tie's deck guide treats stair connections as part of the structure. The local design and applicable Ontario requirements determine the actual stair and landing details; a US illustration does not establish them.
Ask two different questions
First, what supports the stair? Second, what provides the walking surface at its base? A patio can be attractive and reasonably level while being the wrong assumption for structural support. Conversely, a supported stair can still meet an uneven, slippery landing.
Put the finished levels on the drawing
- Show the intended landing elevation relative to the bottom tread.
- Establish the stair support and any foundation work.
- Show drainage away from the landing without creating an awkward walking slope.
- Check the complete run of risers after the proposed changes.
If the stair or landing is unstable, restrict access until it has been assessed. A handrail is not a cure for unpredictable footing.
The worthwhile repair is one that remains coherent through the seasons. Ask how the proposed construction addresses the observed movement, rather than accepting a promise that the stones will be perfectly level on installation day.