Building a deck in Eau Claire typically costs between $25 and $75 per square foot installed, depending on materials and complexity. Here's what local homeowners actually pay.
Most deck projects in Eau Claire run between $6,000 and $30,000 in 2026. A basic 12x16 pressure-treated deck usually lands in the $5,000 to $9,000 range, while a mid-sized composite deck around 16x20 feet costs $15,000 to $25,000. Premium builds with multi-level designs, built-in benches, or high-end materials can push past $30,000.
The per-square-foot cost gives you a better planning number. Pressure-treated pine decks typically run $25 to $45 per square foot installed. Composite decking costs $45 to $75 per square foot. These are typical ranges based on current Wisconsin pricing, not guarantees. Your actual cost depends on your specific project.
Labor makes up 40 to 60 percent of the total cost on most jobs. In the Eau Claire area, skilled trades run around $38 to $55 per hour, which is a bit lower than Milwaukee or Madison but in line with western Wisconsin. Material costs have stabilized compared to the wild swings a few years back, but they still vary by season and supplier availability.
Height makes a big difference. A ground-level deck is straightforward. Once you're 30 inches or more off grade, you need railings, and that adds $150 to $600 per linear foot depending on material. A standard 40-foot railing perimeter in aluminum or composite can add $6,000 to $10,000 to the job.
Footings are non-negotiable in Wisconsin. Frost depth here is 48 inches, so every post needs a concrete footing that goes down four feet to avoid heaving when the ground freezes. That's more digging and more concrete than warmer states require. Our clay and sandy loam soils in Eau Claire drain reasonably well, but wet spots or areas near the Chippewa or Eau Claire rivers sometimes need extra site prep.
Access matters too. If the crew has to haul material through a narrow side yard or down a slope, that adds time. Same with demo of an old deck. Stairs, angles, and built-in features all increase framing complexity and labor hours.
Pressure-treated lumber is the budget choice. It holds up fine in Eau Claire's freeze-thaw cycles if you keep it stained and sealed every couple of years. The upfront cost is lower, but you're signing up for ongoing maintenance. Composite costs roughly double the material price, but you skip the staining and sealing. After 10 or 15 years, the total cost of ownership evens out.
Composite handles our weather well. Eau Claire gets about 33 inches of rain and 46 to 55 inches of snow per year, and we see hard freezes from November through March. Composite boards don't rot, splinter, or soak up moisture the way wood does. If you plan to stay in the house long-term, composite usually makes sense.
The City of Eau Claire requires a building permit for most decks, and the process runs through the Inspections Division at 715-839-4947. You apply online through the city's Evolve permitting portal. They don't accept paper applications anymore. Permit fees in Wisconsin typically run $130 to $450 depending on project size and jurisdiction. If you live in the townships outside city limits, you'll work with Eau Claire County Planning and Development instead.
Budget a bit extra for the unexpected. Sometimes you pull off old decking and find the rim joist is rotted. Or the yard grades differently than it looked, and you need more fill. A 10 percent contingency is smart. And if you're financing the project, factor in how that affects your monthly budget before you sign.
Get at least three written estimates. Make sure each one spells out the same scope so you're comparing apples to apples. Ask what's included: framing, decking, railing, stairs, permits, inspections, haul-away. Some bids include stain or sealer on wood decks, others don't.
Don't pick the lowest number just because it's lowest. Ask how long the company has been working in the Chippewa Valley, whether they pull permits, and who does the actual work. A bid that's 30 percent below the others might mean corners get cut or change orders pile up later. A realistic price from a local contractor who knows Eau Claire's clay soils and winter weather is worth more than a lowball from someone two hours away.
Also in our network: Deck Building Permits and Rules in Ames, IA (2026 Guide), Deck Building Costs in Cedar Rapids, IA (2024 Prices).
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