What to sort out first
Brookfield’s fact sheet lists guards under 36 inches and balusters that let a 4-inch ball pass among the most common deck mistakes. Wauwatosa requires guards at least 3 feet high on a deck more than 2 feet above grade. Ask how the guard posts are fastened to the frame, since a rail is only as strong as that connection.
- Guard height and baluster gaps
- Post-to-frame connections
- Handrails on each stair run
- Material that matches the decking
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
Railings & Guards 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 tall must a deck guard be?
Brookfield requires at least 36 inches from the top of the decking when the deck is 24 inches or more above ground. Wauwatosa requires 3-foot guards on decks more than 2 feet up.
What spacing is allowed between balusters?
Brookfield says a 4-inch ball must not pass through the guard.
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.