Toronto interlock re-levelling, base corrected first
A settled driveway or patio is almost never a paver problem. The stone is fine; the base under it has moved, washed out or was never compacted properly. We lift the affected area, rebuild the base to grade and relay the same pavers. Some contractors list the same work as paver relaying or a lift and relay.
Three causes account for nearly everything we lift. A base laid too thin or never plate tamped gives way under a car within a few seasons. Water arriving where it should not, usually a downspout discharging on the surface, washes fines out of the base and leaves a void.
And freeze and thaw, which is real here but rarely acts alone: it needs water held in a base that does not drain. We find which one it is before quoting, because a surface levelled over the same cause settles again inside two years.
We run a line across the area to find how far it has dropped and how far the dip extends past the obvious part.
Lift and stack
Pavers come up in order and are stacked clear so the same stone goes back in the same pattern.
Rebuild and compact
Base is brought to depth with clean stone, graded to shed water, then plate tamped in lifts rather than all at once.
Relay and sand
Pavers reset flush to the surrounding surface, tamped, and the joints filled with new polymeric sand.
Which One You Need
Six kinds of settling, one cause underneath
The six pages under this hub are the same failure showing up in different places. A driveway that has dropped at the apron, a patio that pitches back toward the house, a walkway that lifts a little more every spring: in each case the stone is sound and the base under it has moved.
What changes is the load on top and how the water gets there, and that decides the depth we rebuild to. Start with the page that matches where yours has dropped. If more than one fits, the visit sorts it, because we open a test spot before quoting rather than after.
