The ground came first. On these newer streets the lots were cut, filled and graded before a single house went up, and every slab poured since has to work with that shape rather than against it. A patio wants to be level and the yard is not. A driveway runs downhill toward a garage. Water leaving your property has to go somewhere specific. Call 801-644-9000 to get in front of Salt Lake County flatwork contractors who design around the grade a Herriman lot hands them.
A sloped yard gives you fewer free choices and more real ones. You can step a patio down in sections, terrace it and hold the difference with a wall, cut into the hill and deal with the material you remove, or build the level surface up and support the fill. Each of those is a different amount of work below the concrete, and the difference between them is usually decided under the ground, not on top of it. A design that ignores the slope and simply forms a big rectangle is the one that shows up cracked and separating a few seasons later.
Driveways on a grade have their own set of decisions. Which way the surface pitches, how steep the approach to the street is, and whether the transition at the top and bottom is gradual enough that vehicles clear it all belong in the plan. A garage sitting at the bottom of a sloping drive is collecting everything that runs down it, so where that water is intercepted matters more than the finish does. Surface texture is part of it too, since a slope that ices over in January asks more of a surface than a flat one does.
Every square foot of flatwork you add is a surface that sheds instead of absorbing. On a hillside lot that is not a small change. Rain and snowmelt that used to spread out across a yard now arrives somewhere faster and in a larger volume, and the question is where you are sending it. Toward the side yard, toward the street, into a swale, or straight down to the neighbor below you, which is the answer nobody wants and the one that happens by default when no one thought about it.
The lot came with a drainage scheme from the day it was graded, and the goal is to work with it rather than interrupt it. That means noticing existing swales before you form across them, planning where a channel drain or a collection point goes, and knowing where the discharge actually daylights rather than assuming it disappears. A contractor should be walking the slope with you and talking about storms and spring melt before the forms go in, because after the pour the surface is committed and your options narrow considerably.
Cut-and-fill grading means part of your yard is original ground and part of it is material that was placed there. Add the backfill packed against the house after construction, the trenches run for utilities and irrigation, and the soil moved around during landscaping, and a fair amount of what you might pour on has not been sitting long. New ground settles, and it settles unevenly, which is exactly the condition that cracks a slab or drops one end of it while the other stays put.
This is why base preparation is the part of the job worth asking about in detail. What the contractor removes, what they bring in, how it gets compacted and what they do differently where a slab crosses from cut ground onto fill are all decisions made for your site. It is invisible work, so it is also the easiest place to save money and the most expensive place to have saved it. When you are comparing contractors, ask each of them how they intend to prepare the ground beneath the slab, and listen for who has actually walked your lot.
Yes, and there is usually more than one way to do it. The surface can be stepped down in sections, terraced and held with a wall, cut into the slope, or built up on supported fill. Which fits depends on how steep the ground is, where water needs to travel and how you want to use the space. The choice is made below the slab, so expect that conversation before any design is settled.
Mainly water and traction. Everything that lands on that surface heads for the garage door, so where the water gets intercepted and where it goes from there belongs in the plan from the start. Pitch, the transitions at the top and bottom so vehicles clear them, and a surface texture that still gives grip when it ices over are the other pieces. Raise all of it before the forms go in.
It affects how it gets built more than where it can go. Placed fill and construction backfill settle differently than undisturbed ground, and a slab spanning from one to the other is where problems tend to appear. A contractor should be identifying which part of your yard is which and preparing the base accordingly, including what happens at the transition between them.
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