Madison deck permit
Madison Building Inspection says you need a permit to build a deck. The fee for most decks under 250 square feet is $75, and staff can approve plans and issue the permit on the spot when the design meets code. You must call for an inspection after the footing holes are dug and before the footings go in. Swapping deck boards needs no permit if the cost is under $500.
Sources: City of Madison Development Services Center, Decks · Wisconsin Uniform Dwelling Code, SPS 325 Appendix B. Checked November 9, 2026. Confirm current requirements with your building inspector.
Composite Decks in Madison
Composite in Wisconsin has to carry a label showing ASTM D7032 compliance under the state deck appendix. The frame under composite is usually wood, so ask how the builder protects the joist tops and ledger from water. Madison’s own deck page reminds owners to use weather-resistant materials such as treated lumber.
Tell the builder which board line you like and ask what joist spacing it needs.
Sources: Wisconsin Uniform Dwelling Code, SPS 325 Appendix B. Checked November 9, 2026. Confirm current requirements with your building inspector.
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FAQ
Is a permit needed for composite decks in Madison?
Madison Building Inspection says you need a permit to build a deck. The fee for most decks under 250 square feet is $75, and staff can approve plans and issue the permit on the spot when the design meets code. You must call for an inspection after the footing holes are dug and before the footings go in. Swapping deck boards needs no permit if the cost is under $500.
What is a typical price?
Mid-grade composite runs $45 to $65 per square foot installed in Wisconsin, per the Wisconsin Homeowners Guide. That is a published estimate, not a quote.
Who does the work?
An independent builder you hire directly. This is a Madison-area referral site, so we pass your request along; we do not build, price or guarantee anything.