What to sort out first
Composite boards still sit on a wood frame, and each brand publishes its own joist spacing and gapping rules. Wisconsin’s deck appendix asks for a label showing ASTM D7032 compliance and warns that a composite member may not match the capability of the same size in wood. Ask to see the label on the product you pick.
- Board brand, line and color
- Joist spacing that brand calls for
- Hidden or face fasteners
- Railing system to match
Sources: Wisconsin Uniform Dwelling Code, SPS 325 Appendix B. Checked November 9, 2026. Confirm current requirements with your building inspector.
By city
Budget first
Our Milwaukee deck cost guide lays out 2026 published prices by material and size, plus local permit fees from Wauwatosa and Brookfield.
Other deck projects
Composite Decks FAQ
Is this site the builder?
No. This site takes deck requests from Milwaukee-area homeowners and passes them to independent deck builders. You agree on price and scope with the builder directly, and a match is not guaranteed.
How much does a composite deck cost here?
The Wisconsin Homeowners Guide lists mid-grade composite at $45 to $65 per square foot installed and premium at $60 to $90. Angi’s national range for composite is $25 to $54 per square foot.
Does composite need a stronger frame?
Often a tighter joist spacing. Each brand sets its own spacing, and the state appendix warns that composite members may not match the same size in wood.
Do I need a permit?
It depends on the municipality. Milwaukee’s DNS checklist says a deck needs a permit. Waukesha, Wauwatosa and Brookfield also require one, and West Allis exempts only very small, low decks and like-for-like board, stair or railing replacement. Other suburbs set their own rules.