The walk to the front door is the route Dad uses every day, so a lifted paver is not cosmetic. It is an edge his foot will meet in the dark. Before you pick up a tool, find out whether you are fixing one stone or repairing what sits under it.

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Read the cause first

Walk the path slowly with Dad's usual route and mark every lip with chalk. Then kneel at the worst one and look underneath. If the stone rocks and the sand bed is firm, the problem may be one loose unit. If the base is soft, the stone has sunk, or water pools near it, the cause is underneath and a surface patch will fail within a season. Roots from a nearby tree, a downspout that dumps onto the walk, and a washed-out edge are the usual reasons.

The test for doing it yourself

A do-it-yourself repair makes sense when one or two units are affected, the base is solid, the lip is small, and no drainage problem is feeding the movement. You will need to lift the stone, check the bed, add or remove bedding sand, reset the stone so it sits level with its neighbors, and sweep joint sand in afterward. Set the stone a hair high at the start, because it will settle, and compact it before it goes back in place.

The test for hiring it out

Call a mason if several stones are moving, the walk runs along a slope, the path is the only way in, or the cause is roots or water. Ask each person quoting the job to write down what happens to the base, whether they dig out and rebuild it or only reset the top, how they handle drainage, who removes the debris, and what the warranty covers. A quote that says reset pavers with no mention of the base is describing a patch.

Do not create a new edge

Whatever you do, the finished surface must be flush from one stone to the next. A reset stone that sits a quarter inch proud is a new trip line. Run a hand or a board across the repaired section before you call it done.

Your next move

This week, walk the route with Dad as he would walk it, chalk every lip, and photograph each one with a coin beside it for scale. Count how many are moving and whether the ground under them is soft. Send that photo set to two people. If you want names in the St. Louis area, start with Local Help in St. Louis.