Concrete steps in London
Two things make step work in London's older neighbourhoods different from the same job in the north end: the clay and the streetscape.
The clay first. Front steps and porch assemblies on these century streets were poured decades ago on bases that were normal practice at the time and are not deep enough for a real freeze-thaw cycle in soil that holds water. Every winter the ground beneath expands and lifts the steps. The house does not move. So the assembly separates from the wall, a gap opens at the top riser, water runs into it, and the following winters widen it and increase the tilt.
The concrete was rarely the problem, which is why repouring onto the base that just failed produces the same failure on the same timeline. The quote worth taking is the one that prices excavating and rebuilding what is underneath, and for the first two years both versions look identical.
The streetscape is the second factor. Front steps sit on the most visible elevation of the house, facing a street whose coherence is what a heritage conservation district exists to protect. Replacing them on a designated property or inside a district can require a heritage alteration permit, and the design is part of that conversation: proportions and materials appropriate to the building rather than a standard set dropped in front of a century facade. Establishing that with the City before design is far cheaper than redrawing afterward.
There is a detail specific to old buildings underneath all of it. Soft brick and stone foundations move seasonally and need to dry, and a rigid concrete assembly tied hard into that masonry restrains the movement and traps moisture at the joint. The steps are detailed to sit against the wall rather than be locked into it.
The Code requirements are unchanged: riser and tread consistency is mandatory, and a guard is required where the steps or landing sit above the height the Building Code sets.
The depth the footings reach is the number that decides whether a set of steps lasts here. London's required frost protection depth for foundations is 1.2 metres, and the ground gives no help at all: the native silt and clay drains very slowly, holds water against a footing through winter, and silt in particular is highly frost-susceptible and loses strength once saturated. Steps founded shallow on this ground do not fail eventually, they fail on a schedule. It is a fair question to put to any quote, because footing depth is invisible the moment the forms come off and it is the whole difference between two prices that look alike.
Where a walkway or driveway is being poured anyway, folding the steps into that visit costs less and produces a cleaner transition. We also pour the walkways they connect to and the driveways they meet, and cover the rest of our London service area.
East along the 401 the heritage areas are smaller and the ground differs, covered on concrete steps in Cambridge. Further east the entrances are largely postwar, dealt with on concrete steps in Kitchener.
