A deck looks like carpentry. Underneath, it's a structure that has to survive Illinois winters, hold up a grill and a crowd of people, and stay bolted to your house without pulling the siding off. Picking the wrong builder here doesn't usually show up on day one. It shows up two winters later when a footing heaves, or three summers later when the ledger board starts to pull away from the rim joist. Here's what actually separates a builder worth hiring from one you'll be calling back to fix things.

Start with what's underground, not what's on top

In this part of Illinois, the frost line generally runs 36 to 42 inches deep. Any footing that doesn't go below that will heave when the ground freezes and thaws, and Peoria winters give you plenty of freeze-thaw cycles to test it, often 30 or more between November and March. If a builder is talking deck boards and railing styles before they've mentioned footing depth, they're skipping the part that actually holds the thing up.

The soil around Peoria is mostly clay till left over from the glaciers, with loess on the bluffs on the west side of town. Clay swells when it's wet and shrinks hard when it dries out in August. That movement is exactly why footings need to sit on undisturbed soil below the frost line, not just poured into a shallow hole and called good. Ask how deep the footings will go and what diameter they're pouring. A 10 or 12 inch sonotube is typical for a standard residential deck, more for larger spans or cantilevers.

Permits aren't a formality, they're protection

Most decks in the city of Peoria need a building permit, and so do decks in unincorporated Peoria County, through the county's own process. The inspector is going to want to see the footings before concrete goes in, and the framing before the decking boards cover it up. That's not red tape for its own sake. It's the only point where someone besides the builder checks the ledger attachment, the joist spacing, and whether the footings actually hit the required depth.

Any builder who tells you permits aren't necessary, or that they'll "just handle it" without pulling one, is asking you to trust work that no one else is going to verify. If you're near a property line, a setback check matters too, especially on the older, tighter lots around the West Bluff or Moss Avenue area where houses sit closer together than in newer subdivisions out toward Dunlap or Edwards. If you're in an HOA, which is common in some of the newer developments on the north side, check your covenants before you design anything. HOAs can be picky about railing style and deck height, and that's easier to fix on paper than after it's built.

Older house, different problems

A lot of Peoria's housing stock, especially in the West Bluff, Uplands, and Averyville neighborhoods, dates back to the early 1900s through the 1950s. Decks on these houses attach to rim joists that weren't built with a deck in mind, and sometimes to balloon-framed walls with no clear rim joist at all. Attaching a ledger board here takes more than lag screws every 16 inches. It takes someone who'll open up the siding, check what's actually behind it, and flash it properly so water doesn't sit against the house framing for the next ten years.

Newer subdivisions built from the 1980s on usually have standard platform framing and a rim joist that's easy to bolt to, but even there, builders cut corners by screwing a ledger straight into siding without flashing. That's the single most common failure point I see on older decks: water gets behind the ledger, the rim joist rots, and the whole deck starts to sag at the house. It's also one of the things you can't see once the siding goes back up, so it matters who's doing it, not just what the finished deck looks like.

What a real quote looks like

A legitimate quote names the lumber species or composite brand, the footing count and depth, the joist spacing, and whether the ledger will be through-bolted or lag-screwed. It should say whether you're getting pressure-treated pine framing or something else, and if composite decking is involved, it should mention the 1/8 inch gap boards need for thermal expansion, because composite moves more than wood does in our summer heat.

A vague quote just lists "deck, 12x16, materials and labor" with one number at the bottom. That tells you nothing about what's going in the ground or how it's attached to your house. Ask for the breakdown. A builder who's done the work can give it to you without blinking.

  • Ask how deep the footings go and why.
  • Ask whether they pull a permit and in whose name.
  • Ask how the ledger attaches and whether they flash it.
  • Ask what happens if they hit old concrete, a buried line, or rot they didn't expect.

Red flags worth walking away from

Watch for a quote that comes in well below everyone else's with no explanation for why. Decking material alone, whether it's treated lumber or a composite like Trex or TimberTech, has a floor price, and so does concrete and hardware. Someone cutting that far below the market is cutting something you won't see until it fails.

Be careful of anyone who wants full payment up front, who won't put the scope of work in writing, or who brushes off questions about insurance and workers' comp. If a worker gets hurt on a ladder on your property and the company has no coverage, that liability can land on you. Ask for proof, not just a verbal yes.

And be wary of anyone promising a full deck build start to finish in two or three days once a permit's involved. Concrete footings typically need a few days to cure before you can frame on top of them, and staining a brand new pressure-treated deck too soon, before the wood has had a few weeks to dry out and the mill glaze wears off, means the stain won't take evenly and you'll be redoing it next year.

What to expect once you've picked someone

A reasonable timeline for a standard deck, from signed contract to first inspection, runs a few weeks, longer if you're waiting on a permit during a busy spring season when every contractor in Peoria is pulling permits at once. Spring and early summer are also when rain can push a schedule back a few days at a time, so don't expect a hard date without some flexibility built in.

Good builders walk you through the design before they touch dirt, tell you what inspections are coming and when, and don't disappear between the framing and the final walkthrough. That's really the whole test. Decks aren't complicated structures, but they're outdoor ones, exposed to clay soil, freeze-thaw, and Illinois humidity year-round, and the parts that matter most are the parts you won't see once it's finished. We've laid out our own approach to footings, framing, and ledger work on our deck builder page if you want to see how we handle it before you decide who gets the job.