Milwaukee deck questions
Do you build decks?
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.
Does Milwaukee require a deck permit?
Yes. The City of Milwaukee DNS checklist says a deck needs a permit and stairs probably do. Suburbs such as Waukesha, Wauwatosa and Brookfield also require one, so check the office for your parcel.
What will my deck cost?
Angi’s 2026 national figures put most new decks between $4,339 and $12,652. The Wisconsin Homeowners Guide lists $25 to $45 per square foot for treated wood and $45 to $65 for mid-grade composite. Your builder prices the actual site.
How deep do footings go here?
The state appendix says below frost or at least 48 inches, whichever is deeper. Brookfield and Wauwatosa both call for 48-inch or 4-foot footings on their deck pages, and inspectors check the holes before concrete.
What should I ask a builder?
Ask who pulls the permit and books inspections, what the written scope covers, which board and hardware are specified, and how change orders are priced. Check insurance and references yourself.
Footings, frost and soil
Wisconsin’s deck appendix puts footings on solid ground below frost penetration or at least 48 inches below finished grade, whichever is deeper. It rules out bearing on unprepared fill, organic soil or mud, and asks the inspector to verify the soil before concrete is placed.
Around Milwaukee, the local pages say the same thing in their own words: Wauwatosa wants 4-foot frost footings under attached decks, and Brookfield lists shallow piers as a top inspection failure.
Sources: Wisconsin Uniform Dwelling Code, SPS 325 Appendix B · City of Wauwatosa, Decks · City of Brookfield Inspection Services, Decks fact sheet (Jan 2026). Checked November 9, 2026. Confirm current requirements with your building inspector.