What to sort out first
The state appendix lists the treated species it accepts (southern pine, SPF, hem-fir and Douglas fir-larch, grade 2 or better) unless a durable species like western red cedar is used. Nails must be threaded, and joist hangers need G-185 galvanizing or stainless steel. Mixing galvanized and stainless parts can cause fast corrosion, so ask what hardware the bid uses.
- Treated pine or naturally durable cedar
- Ground-contact rating for posts near soil
- Galvanized or stainless hardware
- A cleaning and sealing schedule
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
Wood Decks (Treated & Cedar) 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.
Is cedar allowed instead of treated lumber?
Yes. Wisconsin’s deck appendix accepts naturally durable species such as western red cedar in place of treated lumber. Posts near soil still need a ground-contact rating if treated.
How often does a wood deck need sealing?
It varies by product and sun exposure. Angi lists deck staining at $550 to $1,250 and sealing at $550 to $1,330 nationally, so build upkeep into the budget.
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.