How Much Does It Cost To Build A Deck? 2025 Pricing Breakdown

Building a new deck in Chicagoland, Illinois, is an assured way to increase your home’s value and beautify your outdoor space. However, you need to understand several costs associated with deck construction to choose the right contractor and design and ultimately make a return on your investment. 

Typically, estimating a working figure for an outdoor deck project is the same process regardless of location. Research on factors such as material type, deck size, labor, and additional features helps calculate a competitive bargain on third-party quotes. 

This article will teach you the basics of budgeting effectively, whether you’re considering a basic deck or a fully customized outdoor retreat.

Average Cost of a New Deck in Illinois in 2025

Again, the cost of building a deck in Illinois varies depending on materials, design complexity, and location. On average, homeowners in Illinois and the Northeast Central region can expect to pay between $20,000 and $50,000 for the highest-quality (composite or wood) deck installation. Smaller decks made from basic materials may cost closer to $5,000 to $8,000, while larger, custom-designed composite decks can exceed $30,000, depending on size. 

In Chicagoland, the cost of a composite deck averages around $25,005, with an estimated resale value of $13,336. This estimate guarantees homeowners can recoup about 53.3% of their investment, according to the latest Cost vs. Value Report. 

Compared to the national average, though, which shows a cost of $24,206 and a resale value of $16,498 (68.2% recouped), Illinois homeowners may experience slightly a lower ROI. Regardless, it will still pay off in the added home value and long-term usability.

Contact Warner’s Decking for current inquiries on the cost of a composite deck installation in Chicagoland. 

Factors That Influence Deck Pricing in Illinois

1. Deck Size and Design Complexity

Size is one of the most significant factors affecting the cost of a deck. Larger decks require more materials, increased labor, and additional structural support, consequently, higher cost. 

A simple 200-square-foot deck costs significantly less than a 500-square-foot multi-level deck with built-in seating and lighting. 

Custom designs with curves, intricate railings, and unique layouts also add to the final price. Chicagolanders should also expect higher labor costs for extra design elements due to the city’s higher contractor rates.

2. Material Choices: Wood vs. Composite

The type of decking material you choose plays a crucial role in pricing. Traditional wood decks, such as pressure-treated lumber, typically range from $15 to $35 per square foot, making them a more budget-friendly option upfront. However, wood requires regular maintenance, staining, and sealing, which adds to long-term costs. 

Composite decking, such as Trex, costs between $40 to $70 per square foot but offers superior durability, low maintenance, and a lifespan of 25 to 50 years. 

In Illinois, a wood deck averages $18,360, with a resale value of $12,532, meaning homeowners recoup 68.3% of their investment—higher than composite decking. However, maintenance costs for wood decks add up over time, making Trex a more cost-effective option in the long run.

3. Labor and Installation Costs in Illinois

Labor costs vary based on deck size, site conditions, and complexity. In Illinois, professional deck installation costs range from $4,000 to $15,000, depending on the project’s scale. 

Chicagoland, being the largest metropolitan area in Illinois, has higher labor costs and stricter building codes that can increase installation expenses. If excavation or foundation work is required, such as installing concrete footings, additional labor expenses may apply. 

Hiring an experienced contractor like Warner’s Decking ensures expert craftsmanship and a smooth installation process, minimizing unexpected costs.

4. Permits and Inspection Fees in Illinois

Most cities and counties in Illinois require permits for new deck construction to ensure compliance with local building codes. Permit costs typically range from $150 to $500, depending on the deck’s size and structural requirements.

In Chicagoland, permit fees may be higher due to additional zoning regulations and inspections. Warner’s Decking handles all permitting and inspections, ensuring your deck meets Illinois state and local regulations without added stress.

5. Additional Features and Customization

Adding extra features to your deck boosts both the cost and the value by improving functionality and visual appeal. Built-in benches, pergolas, custom railings, outdoor kitchens, and LED lighting can raise your project price by $1,000 to $10,000. For a limited time, Warner’s Decking is offering $999 off our premium lighting package when you choose us as your deck builder in Illinois.

High-end finishes, glass railings, and motorized louvered roofs further elevate the design. 

How to Save on Deck Construction in Illinois

Homeowners looking to maximize their budget can take advantage of financing options, off-season discounts, and streamlined deck designs. Established deck builders will offer flexible financing plans that give you a chance to build your dream deck without a large upfront expense. 

Warner’s Decking: Illinois’ Premier Trex Deck Builder

When investing in a new deck, choosing an experienced contractor is just as important as selecting the right materials. Warner’s Decking specializes in Trex composite decking installations, providing Illinois homeowners with long-lasting, low-maintenance outdoor solutions. 

With expert craftsmanship and a commitment to quality, Warner’s Decking ensures your project is completed on time and within budget, whether you’re in Chicagoland, the suburbs, or elsewhere in Illinois.

Frequently Asked Questions

How much does a 20x20 deck cost?

A 20x20 deck (400 square feet) can range from $15,000 to $30,000, depending on materials and additional features. A pressure-treated wood deck of this size may cost $15,000 to $18,000, while a cedar deck ranges from $20,000 to $25,000. A composite deck in this size category typically costs $20,000 to $30,000 but requires significantly less maintenance and lasts much longer.

How long does it take to build a deck?

The timeline depends on the deck’s complexity, size, and weather conditions. On average, a standard deck takes one to three weeks to complete. More intricate designs, additional features, or city permit approvals may extend this timeframe.

What is the most cost-effective decking material?

While pressure-treated wood has the lowest upfront cost, composite decking is the most cost-effective long-term choice. Trex composite decking eliminates the need for staining, sealing, or replacing boards, reducing maintenance costs over the years. With a lifespan of 25-50 years, it provides better value than wood decks that last only 10-15 years with regular upkeep.

Do I need a permit to build a deck in Illinois?

Yes, most deck projects in Illinois require permits to comply with local building codes. The cost of a permit ranges from $150 to $500, depending on the size and location. In cities like Chicagoland, stricter regulations may require additional inspections. Warner’s Decking handles all permits to ensure a hassle-free process.

How can I save money on building a new deck?

You can save by scheduling your deck installation during the off-season (late fall or winter) when contractors have more availability. Opting for a simpler design and financing options offered by Warner’s Decking can also help manage costs while ensuring you get the best value.