Patios & Walkways · Cambridge
Interlock Patios and Walkways in Cambridge
A patio fails quietly: a slab tips an inch toward the house, the joints open, and five years later there is water in the basement wall and nobody connects the two.
Patios and walkways carry people rather than cars, so the construction standard allows a thinner base: the CMHA/ICPI minimum is 100 mm (4 in) of compacted granular over well-drained soil. The same caveat applies as for driveways: more over wet or weak ground and in cold climates. In practice a Cambridge patio built on 100 mm over undisturbed clay without fabric is a patio that will need re-levelling, so the depth is decided by what the excavation finds, not by the minimum.
Grade is the whole job
Every patio against a house has to fall away from it, and the City's by-law page is clear that water cannot be directed at a neighbouring property or onto a walkway, entrance or sidewalk, and that yards must be graded to prevent ponding. A patio that is dead level looks right on the day and holds a puddle by the first rain; one pitched toward the foundation sends every storm at the wall. The right fall is modest and consistent, and where a yard slopes toward the house the answer is a drain or a small retaining step, designed rather than hoped for.
Pavers or slabs
Standard concrete pavers lock together and handle anything a patio does. Large-format slabs, the 600 mm squares and the flagstone-look pieces, are what most people picture for a modern patio and they need a flatter, more carefully screeded bed because a big slab shows every high spot as a rock. Natural flagstone on a granular base is a different trade with different joints and it suits the older Galt houses, but it is less forgiving of frost movement than pavers. All three get specified honestly for what you want and what the ground allows.
Walkways and steps on older lots
On the century streets through Galt and the older parts of Preston, the front walkway is usually the job that has been patched the most: poured concrete over the original, a step rebuilt in block, settlement toward the porch where the fill around the foundation has consolidated for a hundred years. The fix is to excavate the whole run, not just the dip, because the settlement is in the fill and the fill is everywhere. If the house is in the Dickson Hill or Main Street Heritage Conservation District, or is individually designated, the City's heritage staff need to approve an exterior alteration under the Ontario Heritage Act before the work starts, and material choice is part of that conversation.
What to expect
A typical back patio is two to four working days on site: excavation and base, then laying, cutting and sanding. A front walkway is often one to two days. The quote depends on area, access to the back yard, how much cutting the shape and the slab size require, whether there are steps, and the depth of base the ground calls for.
Frequently asked questions
Do I need a permit for a patio in Cambridge?
The City's building permit page lists landscaping among the projects that do not need a building permit. The exceptions are a retaining wall over 1 metre, which may need one depending on location, and a property in a Heritage Conservation District or individually designated, where exterior work needs heritage approval first.
Can the patio be level with my back door?
Close to it, but it has to fall away from the house and sit below the door sill and the top of the foundation, so that water and snowmelt go to the yard and not into the wall. We set the finished height from the house and work outward.
Large slabs or regular pavers?
Slabs look more modern and show more joints less; pavers tolerate more movement and cost less to lay. On a patio that gets a hot tub or heavy furniture, or on ground that moves, pavers are the safer choice. We will tell you which we would put on your lot.
Serving Cambridge and surrounding areas. Contact us for a no-obligation quote specific to your property.