What to sort out first
Milwaukee and its suburbs each handle their own deck permits. The City of Milwaukee lists decks as needing a permit and stairs as probably needing one. Waukesha wants a plat of survey with the plans, Wauwatosa wants a survey and plans at 1/4 inch per foot, and Brookfield wants a survey under a year old. West Allis skips the permit only for a deck under 25 square feet within 4 feet of grade.
- A survey of the lot
- Plans and a framing section
- Setbacks and easements
- Who books the inspections
Sources: Wisconsin Uniform Dwelling Code, SPS 325 Appendix B · City of Milwaukee Department of Neighborhood Services, Does It Need a Permit? · City of Waukesha, Residential Decks · City of Wauwatosa, Decks · City of Brookfield Inspection Services, Decks fact sheet (Jan 2026) · City of West Allis Code of Ordinances, 13.05 Permits. 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
Permits & Design 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.
What does Waukesha want with a deck permit?
Plans, a current plat of survey and, for homeowners, a signed Cautionary Statement. Contractors need DC and DCQ certifications.
How long does Wauwatosa take?
The city says to expect about two weeks for a formal plan review response.
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.