Hardscaping in the North Shore & Northwest Suburbs

Water and base preparation, in that order, almost never the blocks. A wall is a dam as much as a retainer: the soil behind it holds water, that water freezes, and the expansion has to go somewhere. Without a stone chimney behind the face and a drain tile at the bottom with a route out, it goes into the wall. The other half is the base. A first course bedded on uncompacted soil settles unevenly, the courses above it lose their batter, and after a couple of winters the wall has a visible belly.

The model residential code requires a permit above forty-eight inches measured from the bottom of the footing, and engineered design above four feet, and it requires a permit for any height where the wall carries a surcharge, meaning a driveway, a pool, a slope or a structure bearing down behind it. Villages amend the model code, so the binding answer always comes from your own building department. It is worth the phone call early, because the permit requirement can change the design rather than just adding a form.

Sometimes, and the base decides. If the base was built properly and the surface has simply settled or shifted, lifting, re-screeding and resetting is often a genuine fix. If the base was never right, or there was never drainage behind the wall, a repair buys a season or two and then repeats. That is worth knowing before spending either way, so it gets looked at honestly rather than quoted as a repair because a repair is the easier sale.

A segmental block wall is made of manufactured units built to a set batter, usually with geogrid tied back into the soil on anything of height, predictable, uniform, and the right answer for straight runs and terraces. A boulder wall works by mass and friction, handles irregular grade and curves more forgivingly, and looks less engineered, which some properties want. It needs equipment access to place the stone, so the practical limit is often the gate and the side yard rather than the wall itself.

It depends on the product and far more on the exposure. South and west faces take most of the UV and weather fastest; a shaded north deck can go considerably longer. What matters more than frequency is condition at the time of application: the boards have to be clean and genuinely dry, or the finish sits on the surface and sheds in sheets the following spring. In this climate a horizontal deck surface takes summer UV and then winter ice and salt, which is a harder combination than either alone.

It depends on excavation and scope, and weather affects it more than almost any other work on a property. There is also a seasonal limit worth naming: a saturated or frozen subgrade cannot be compacted to a reliable density, and base built on frozen ground settles when it thaws. That rules out part of the year for anything structural. A timeline is set after walking the site, where the access, the spoil and the grade are visible, not before.