Deck Cost in Waukesha, WI: Cedar, Pressure-Treated and Composite Prices
A typical new deck costs $9,000 to $20,000, with a national average of about $14,000, according to NerdWallet's 2026 guide. The decking boards are a smaller part of that than most people expect: Consumer Reports puts wood decking, mostly pressure-treated pine, at about $200 to $1,100 or more per 100 square feet, and composite at about $300 to $700 per 100 square feet. In the City of Waukesha, a new deck also needs a building permit with plans and a site survey, footings below the frost line, and at least three inspections.
Published 2026-10-26 · 6 min read · 1,442 words
Deck project - T&JHere is what drives the price of a Waukesha deck, how cedar, pressure-treated and composite compare in a Wisconsin winter, and what the city requires before you build.
Waukesha Deck Costs at a Glance
| Item | Figure |
|---|---|
| Typical new deck, total | $9,000 to $20,000; national average about $14,000 |
| Wood decking boards (mostly pressure-treated pine) | About $200 to $1,100 or more per 100 sq ft |
| Composite decking boards | About $300 to $700 per 100 sq ft |
| PVC (plastic) decking boards | About $525 to $1,200 per 100 sq ft |
| Cedar | Costs more than pressure-treated; needs periodic sealing and staining |
| City of Waukesha permit | Required, with plans and a plat of survey |
| Footings for an attached deck | Below the frost line and at least 48 inches deep |
For a 16 by 20-foot deck (320 square feet), the decking boards alone come to about $640 to $3,520 in wood or $960 to $2,240 in composite at Consumer Reports' prices. Footings, framing, railings, stairs and labor make up the rest of a typical $9,000 to $20,000 deck.
Pressure-Treated, Cedar or Composite in a Waukesha Winter
Consumer Reports' decking tests point to clear trade-offs:
- Pressure-treated pine is the budget choice and resists slips best in testing. Treated pine is far more weather-resistant than regular stained pine, but unfinished wood changes color, cracks and stains unless it is refinished.
- Cedar naturally resists moisture and looks warmer, but it costs more than pressure-treated wood and needs periodic sealing and staining to hold up to the weather.
- Composite keeps its color better than unfinished wood and many boards are now capped in plastic against mildew. Most are heavier and more expensive than pressure-treated pine, and some flexed or sagged in testing, so the joist spacing has to follow the maker's rules.
- PVC (plastic) resists the elements and staining best, but some boards are slippery and all of them sagged more than wood in testing.
Deck - T&JSnow sitting on the boards, freeze-thaw cycles and ice melt on the stairs all favor a material you are willing to maintain. For a closer look at the two most common choices, see our guide to composite vs wood decking in Wisconsin weather.
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What Drives the Price of a Waukesha Deck
Size and height.
A raised deck needs taller posts, guards and stairs; a deck close to the ground needs fewer of each.
Footings.
Footings for a deck attached to the house must go below the frost line and at least 48 inches below grade under Wisconsin's dwelling code, which adds digging and concrete on every post.
Decking material.
The board choice above, plus matching fascia and trim.
Railings and stairs.
Wood, composite, metal or cable railings vary widely in price.
Electrical.
In the City of Waukesha, a deck you reach from inside the house must have an electrical outlet, which needs its own electrical permit.
Tearing out an old deck.
Removal and disposal add to the job; see our deck replacement cost guide.
Extras.
Built-in benches, lighting, privacy screens or a roof; our guide to adding a roof over a deck or patio covers the last one.
For statewide per-square-foot pricing, see our Wisconsin deck cost guide.
City of Waukesha Deck Permit Rules
The City of Waukesha's building inspection rules for decks:
- A building permit is required for a new deck, with detailed plans and a current plat of survey showing the property lines, existing buildings and the proposed deck.
- Who can apply: a contractor with a city contractor account and Wisconsin Dwelling Contractor and Dwelling Contractor Qualifier certifications, or a homeowner who lives at the address and signs the city's cautionary statement.
- The plans must show post size and spacing, footing size and depth, joist and beam sizes and spans, how the deck attaches to the house, the decking material, and stair and guard details.
- Setbacks: a deck 12 inches or more above grade that is attached to the house, or within 10 feet of it, must meet the side-yard setback and may project no more than 10 feet into the required rear yard. A freestanding deck must be at least 10 feet from the house and 3 feet from a lot line, and a deck under 12 inches high must stay at least 3 feet from a lot line.
- Inspections: footings or post holes before concrete is poured, framing before it is covered, and a final with steps, guards and handrails installed, plus electrical inspections for any new wiring.
If you live in the Town of Waukesha or another municipality, the rules are set by that building department; our guide to deck permits in Wisconsin covers the common requirements.
A deck built without a permit can fail a home-sale inspection or have to be opened up for the city to inspect. The footing inspection happens before the concrete goes in, so it cannot be done after the fact.
Planning a Spring Deck Over the Winter
Fall and winter are a good time to settle the design, the material and the permit, so the build can start once the ground thaws. Have these ready:
A plat of survey
for your lot, needed for the permit.
The size and shape
you want, and how high it sits off the ground.
The material:
pressure-treated, cedar, composite or PVC.
Where the stairs go
and what railing you like.
Whether you want power
or lighting on the deck; an outlet is required on a deck you reach from inside the house.
Deck - T&JGetting a Deck Estimate in Waukesha
A free in-home estimate measures your yard, checks the setbacks and grade, and prices the deck in pressure-treated, cedar and composite side by side, with the permit, footings and railings included in writing.
T&J is a father-and-son team that has worked in Wisconsin since 1989. John is your single point of contact from the first call through the final walkthrough, Telli is on site running the work, and T&J gives a written 2-year warranty. Homeowners in Waukesha and across Waukesha County can see our Waukesha deck construction page, our deck construction services, or request a free in-home estimate.
Frequently asked questions
How much does a deck cost in Waukesha?
A typical new deck costs $9,000 to $20,000, with a national average of about $14,000. Size, height, footings, material and railings decide where yours lands.
Is cedar or composite better for a Wisconsin deck?
Cedar naturally resists moisture but needs periodic sealing and staining. Composite keeps its color better and needs less upkeep, but most boards cost more than pressure-treated wood and some flex more.
Do I need a permit to build a deck in Waukesha?
Yes. The City of Waukesha requires a building permit with detailed plans and a plat of survey, and inspections of the footings, framing and the finished deck.
How deep do deck footings have to be in Wisconsin?
Footings for a deck attached to a house must be below the frost line and at least 48 inches below the adjacent grade.
Does a deck need an electrical outlet in Waukesha?
Yes, if you can reach the deck from inside the house. The city requires an outlet within the deck's perimeter, with a separate electrical permit.
How close to the property line can a deck be in Waukesha?
A deck under 12 inches high, or a freestanding deck, must be at least 3 feet from a lot line. A raised deck attached to the house must meet the side-yard setback for the district.
Can a homeowner get a deck permit in Waukesha?
Yes, if you live at the address. Homeowners apply through the city's online permit system and sign a cautionary statement.
Pricing is based on our own recent projects. Written by John (PM, 14 yrs) and reviewed by Telli, who has been remodeling in Wisconsin since 1989. Published 2026-10-26.
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