Why You Should NEVER Build a Deck Without a Professional Deck Contractor

Building a deck is a fun weekend project to do in your free time and to save money. But it’s far more complex than most people realize. From permits and safety codes to structural design and material handling, it’s not just about screwing boards together.

Every year, homeowners spend thousands fixing DIY deck mistakes that could’ve been avoided by hiring a professional. And while it’s tempting to save a few bucks, cutting corners often leads to more significant problems, higher costs, and serious safety risks.

In this article, we’ll explain why going alone is rarely worth it and how hiring a professional deck contractor ensures your outdoor space is safe, code-compliant, and built to last.

1. Decks Are “Lifetime” Structures — Not Weekend Projects

A well-built composite deck can last over 25 years with low maintenance. It’s a load-bearing structure that supports people, furniture, and even weather extremes. That means it needs a strong foundation, proper footing, and materials that can handle pressure and temperature changes without failing.

If any part of the building is off — like uneven joists, poor drainage, or weak railings — the entire structure could collapse sooner or later. That’s why professional deck builders treat a deck like a small building. They measure, level, anchor, and reinforce everything to meet strict safety standards. No cutting corners. 

Even a small or simple-looking deck needs proper framing, spacing, and fastening systems that most homeowners aren’t trained to handle. Consider it a major construction and not a casual DIY project.

2. One Mistake Can Ruin the Whole Project

In the business of deck construction, there’s no such thing as a small mistake. As we’ve mentioned earlier, one misstep, like using the wrong fastener, misaligning footings, or cutting a board too short, can cause the entire structure to fail.

DIYers often discover problems too late. Unsurprisingly, there are so many YouTube videos dedicated to this issue. Worse, mistakes with framing or support beams can go unnoticed until someone gets hurt or the deck collapses under weight.

Fixing these errors isn’t cheap. Many homeowners end up hiring a pro to tear out and rebuild what they tried to do themselves, doubling their total cost or more. When you hire a professional from the start, you get it done right the first time or have any touch-ups done at the expense of the deck contractor.

3. Permits, Codes, and Inspections

Like the Chicagoland Department of Buildings, every city has strict deck construction and safety rules. That means applying for a building permit, following local codes, and passing inspections before it’s fit for residential or commercial use. 

Most DIYers aren’t familiar with these requirements and sometimes fail to get a permit. If you build without a license or miss a code, you could be forced to tear everything down or pay hefty fines. Worse, a failed inspection delays your project and could impact your home’s resale value.

Professional contractors in your locality can handle all of this without fuss. They know the rules, pull the proper permits, and make sure the deck passes inspection the first time. It’s one less headache and a huge safety net for your investment.

4. Safety First — Especially With Elevated or Multi-Level Decks

Elevated and multi-level decks must support more weight, resist strong winds, and include appropriately installed railings and stairs. One loose board or weak connection can cause serious injury or worse. 

Unfortunately, most DIY builds don’t meet the structural demands of these more complex designs. Without training, it’s easy to overlook critical details like ledger board anchoring, post spacing, or joist hangers—all of which keep the deck from collapsing.

Professional deck contractors understand these safety requirements and follow strict guidelines to ensure everything is secure and code-compliant. When safety is on the line, there’s no room for guesswork.

5. Quality Materials Are Only as Good as the Install

Buying premium materials like Trex or other composite decking is smart—but even the best boards won’t perform well if installed incorrectly.

Improper spacing can cause boards to buckle or trap moisture. Misplaced fasteners can weaken the frame or void the warranty. Even simple things like board alignment or cutting angles can impact how the deck looks and lasts.

Our skilled deck builders are trained to install any material to deliver on its promise of durability and aesthetics. So, when you invest in high-quality decking boards like Trex, consider only capable builders to carry out the installation.

6. Warranties Don’t Apply If You Install It Wrong

Most composite decking brands offer strong warranties—some up to 25 or even 50 years. But here’s the catch: most warranties are only valid if a certified professional installs the product.

If you install it yourself and something goes wrong—warping, splitting, water damage—you may be stuck paying for the repairs out of pocket. Manufacturers can void the warranty if the installation doesn’t follow their guidelines.

When you hire a licensed deck contractor, you’re getting expert labor and protecting your investment with full warranty coverage. It's a peace of mind that DIY simply can’t offer.

Hiring a Pro Doesn’t Mean Losing Personal Style

Hiring a professional doesn’t mean giving up control. In fact, it opens up more possibilities. A skilled deck contractor can take your ideas—custom layouts, unique railing styles, built-in lighting, or multi-level designs—and turn them into a safe, stunning reality.

You get to choose the materials, features, and layout. The difference is that a pro knows how to bring it all together the right way, with structural integrity and lasting value.

So you still call the shots—but without the stress of figuring it all out alone, risking costly mistakes, or wondering if your deck will pass inspection.

Building a deck is one of the best ways to expand your home’s living space—but it’s not the place to cut corners. At the same time, DIY might sound like a fun challenge, but the risks, costs, and complexity often outweigh the rewards.

Hiring a professional deck contractor ensures your deck is safe, up to code, and built to last. You can still shape the design, choose the materials, and make it your own without the stress, mistakes, or long weekends lost to trial and error.

Schedule An Appointment With An Illinois Deck Contractor

At Warner’s Decking, we specialize in high-quality, custom composite decks built to fit your lifestyle and last decades. Our team handles everything, from permits to precision installation, so you don’t have to. Contact us today for a consultation. 

Frequently Asked Questions

Can I legally build a deck myself without a contractor?

Yes, homeowners can legally build their deck in most areas—but that doesn't mean it's a good idea. You’ll still need to pull permits, follow local building codes, and pass inspections. Failing to do so can result in fines, forced demolition, or serious safety risks. A licensed contractor ensures your deck is code-compliant from day one, eliminating guesswork and protecting your investment.

What happens if my DIY deck doesn’t pass inspection?

If your deck fails inspection, you may be required to make corrections, halt the use of the structure, or tear it down entirely. This often means hiring a professional to fix or rebuild the deck—at double the cost. Experienced contractors understand local code requirements and build to meet inspection standards the first time, saving you time, money, and stress.

Is it cheaper to build a deck yourself?

While DIY deck building may seem cheaper upfront, it often costs more in the long run. Mistakes with measurements, materials, or fasteners can lead to structural issues, warranty voids, and expensive repairs. Professional contractors work efficiently, avoid costly errors, and often get better material prices, delivering long-term value and peace of mind.

Do composite decking warranties cover DIY installation?

Most composite decking warranties do not cover damage caused by improper installation. Manufacturers often require certified professionals to install their products according to specific guidelines. If you install it yourself and something fails, company representatives may void your warranty upon investigation. A licensed TrexPRO builder like Warner’s Decking guarantees correct installation and the safety of warranty coverage if needed. 

Will a professionally built deck add more value to my home?

Absolutely. A well-designed, code-compliant deck built by a professional contractor boosts curb appeal and resale value. Homebuyers often also ask whether outdoor structures were permitted and professionally built. A local contractor’s work comes with the necessary documentation and permits to meet any inspection upon appraisal. Call (630) 420-1940 for more information on the home improvement value of outdoor decks in Illinois.