How Much Does a Composite Deck Cost in the Chicago Western Suburbs? (2026)

What determines the cost of a composite deck?

Five factors do most of the work. Size is the obvious one, but it’s less linear than homeowners expect. Doubling square footage doesn’t double cost, because design, permitting and mobilization don’t double. Elevation matters more. A walk-out deck twelve feet off grade needs engineered structure, longer stair runs and more railing than a grade-level platform of the same size. Railing selection is the quiet budget mover.

Cable railing systems that keep sightlines open cost meaningfully more than standard balusters, and on an elevated deck railing can be a five-figure line item on its own. Framing, steel versus wood, shifts both cost and lifespan (we cover this fully in our steel vs. wood framing guide). And site conditions like grade, access, soils and tree preservation are the variable no online calculator can see, which is why our own estimator gives a range rather than a price.

What do the price bands include?

Here’s how 2026 investment levels break down on our projects across DuPage, Kane and Will County:

Every band assumes full 3D design before construction, engineered steel framing, all permits handled, and a fixed price rather than an estimate with allowances that grows on the jobsite.

If a patio is part of the plan, the hardscape has its own bands. Patio and walkways run $20,000 to $40,000, and a patio with walls and steps runs $40,000 to $80,000. Our hardscapes page covers what goes into each.

Where do our deck projects land?

We went back through the deck projects signed in our project system since December 2022. About three quarters of that deck work, by value, came from projects at $60,000 or more. The two largest were complete outdoor environments above $180,000.

Our published deck pricing starts at $60,000 today. The smaller projects are real, and we still take them on when the schedule allows. We’d rather show you the spread than a single headline number.

Why is the range so wide?

Because “a deck” isn’t one product. A 300-square-foot grade-level platform and a 900-square-foot elevated multi-level with cable rail, picture-frame borders and integrated stairs are different structures that happen to share a word.

The real answer to “what does a deck cost” is always a range until someone has stood on your property. That’s why our process starts with a free discovery call and a $150 site visit, which produces a real investment range for your specific lot before you spend anything on design. Details are on our A.C.E. Method page.

What pushes the cost to build a deck up, and what brings it down?

What pushes it up. Height above grade, because every foot adds post length, bracing, stairs and railing. Railing type, which runs from composite at the low end through aluminum and cable to glass at the top. Board choice, since PVC collections cost more per board than capped composite. Diagonal or herringbone patterns, which need tighter joist spacing underneath. More stair sets, more landings, skirting around the base, and anything that ties into the house like a door threshold or a covered roof.

What brings it down. A simpler shape. A deck closer to the ground. Straight board runs instead of patterns. One stair set rather than two. Composite railing instead of cable or glass. And the biggest one, a smaller footprint. Once you’ve decided what matters most, the smaller details can be looked at, but size and height are where the real money is.

The one that surprises people. Small decks cost more per square foot than large ones. Setup, the permit, the dumpster and the inspection trips cost the same whether the deck is 150 square feet or 500, so on a small deck they make up a bigger share of the price.

Why are some deck companies cheap and some expensive?

Three usual reasons, worth checking before you sign anything. Wood framing under composite decking. The surface carries a 25–30 year warranty while the structure beneath it starts its slow decline on day one. Allowance-based estimates. A low headline number with “allowances” for railing, stairs or footings that get trued up (upward) during construction.

And scope subtraction, meaning no design, no engineering, and permits left to you. A lower number for a different product isn’t a better price. When comparing bids, ask each contractor three things. Is this price fixed? What framing is under it? Who pulls the permit?

The expensive end has its reasons too. A company that designs in 3D, engineers the structure, uses its own crews and fixes the price before it starts is carrying real costs a two-page quote doesn’t. Design takes real time, so we price it openly. The design phase is $3,000, with $1,500 applied toward your build.

What costs do homeowners not see coming?

What’s under the deck. Footings or helical piles, and how many, depend on the soil and the span. It’s the part nobody sees and it’s priced per footing, so a design with fewer posts saves money here. Steel framing spans further than wood, which usually means fewer posts.

Stairs, landings and skirting. Each stair set is its own line, and skirting is priced by the face area it covers. On a tall deck both add up quickly.

Permits and construction plans. An attached deck needs a permit in DuPage, Kane and Will County. Some quotes leave this to you. Ours include it, along with the plans the village asks for. Our deck permit guide covers what each county asks for.

The space underneath. If the deck is elevated, you’ll eventually wonder about using the space below it. Under-deck waterproofing typically runs $25,000 to $40,000 installed, and it’s far easier to design in from the start than to add later. More on our under-deck page.

The things you add once you’re out there. Lighting, screens and covers. Retractable screens run $5,000 to $7,000 per opening. If there’s an old deck, taking it out is part of the scope too. None of these are hidden on our side, but they’re the items that make two quotes for “the same deck” look different.

Before design. The $150 site visit is a separate fee. It’s what turns a phone conversation into a range grounded in your actual lot.

What does a composite deck cost over its lifetime?

The initial cost is the number on the contract. The lifetime cost is that number plus everything you spend keeping the deck usable until it has to come out, and that’s where composite and steel earn their place.

The surface. TimberTech capped composite carries a 25 or 30 year warranty depending on the collection, and their Advanced PVC collections carry a 50 year fade and stain warranty. Neither needs sanding, staining or sealing every spring.

The structure. Fortress steel framing carries a 25 year limited warranty. It doesn’t rot, twist or warp, so it holds a flat surface for the boards and won’t be the reason the deck gets torn out in fifteen years. Pressure-treated wood framing costs less up front, which is exactly why it shows up under so many low quotes.

So the fair way to compare is to ask what’s under each price and how long that part lasts. A cheaper frame under a 30 year board is a deck whose lifespan is set by the frame.

Composite vs PVC decking: what’s the cost difference?

Both are low-maintenance boards and both sit on the same steel frame, so the difference is the board itself. Capped composite is wood fiber and polymer with a protective cap. It’s the best balance of look and performance for most homes, and TimberTech’s Legacy, Reserve and Terrain lines carry a 30 year warranty. PVC has no wood fiber at all. It costs more per board, and TimberTech’s Vintage, Landmark and Harvest lines carry the 50 year fade and stain warranty.

On a full project, the board choice moves the total less than height or railing does, because the frame, footings, stairs and permits cost the same either way. We walk through both in 3D, side by side on your deck, before anything is ordered. Our composite decks page covers the collections we build with, and our composite vs PVC decking guide compares the two in full.

Can I finance a composite deck?

Yes. Financing is available through our partner Acorn Finance, and you can apply directly from your project estimate. You compare prequalified offers from Acorn Finance’s lenders in a few minutes, with no impact to your credit score. More on our financing page.

If you’d like to see your range in monthly terms, the deck estimator shows an example payment next to it. Your actual rate and term depend on your credit and the lender.

Is a composite deck worth it?

It’s worth it if you’ll use it and you plan to stay. A deck you’re out on most evenings from May to October is a room you added to the house. One you’d only see from the kitchen is harder to justify at these numbers, and we’ll tell you so on the first call.

It’s also worth it when the alternative is doing the job twice. A wood deck needs staining every year, and its frame usually decides when the whole thing comes out. It’s cheaper on day one and more expensive by the end. Composite on steel costs more at the start and asks very little of you afterward.

Where it isn’t worth it is if you’re selling in a year or two, or if the space won’t get used. Spend the money on the space you’ll sit in.

Common questions about deck cost

How much does it cost to build a deck in the Chicago western suburbs?

In 2026, deck-primary projects typically cost $60,000 to $90,000 on steel framing. Larger decks, or a deck and patio designed together, run $100,000 to $180,000, and flagship environments with a roof, kitchen and fire run $180,000 to $300,000+.

Do you build decks under $60,000?

Our deck pricing starts at $60,000, and most of the deck work we’ve signed by value sits above it. Smaller decks we take on when the schedule allows. The deck estimator shows the real range for your size either way.

Why is a composite deck more expensive than a wood deck?

The boards cost more, and we frame in steel rather than wood. In return there’s no annual staining or sealing, the surface carries a 25 to 50 year warranty depending on the line, and the frame carries 25 years.

Why do deck quotes vary so much between contractors?

Because scope varies. Framing material, whether design and permits are included, and whether the price is fixed or built on allowances that grow during construction all change the number. Compare what’s under the number, not just the number.

Does the site visit or design fee count toward the build?

The $150 site visit is a separate fee. The $3,000 design phase includes $1,500 applied toward your build.

How do I get an accurate deck price for my property?

A free discovery call gives you a real range based on completed projects. A $150 site visit grounds it to your lot, and a completed 3D design produces a fixed price.

How do I get a real number for my property?

Start with the free 30-minute discovery call. We’ll talk about what you’re picturing and give you a real range based on completed projects. If it makes sense, a $150 site visit turns that range into a grounded figure, and the design phase turns it into a fixed price. We build across the western suburbs. See what deck projects look like in Naperville, and it all starts with the deck itself. More planning guides, from framing to permits, are on our guides page.

Want a number tonight? The deck estimator builds a range from your size, height, boards and railing, using the same structure we estimate with.