Deck Construction Permits in Madison

Local Rule

City of Madison Building Inspection Division / Development Services Center

The city's own Development Services Center page states it plainly: a permit is required to build a deck in Madison, with no small-deck exemption, this covers even a freestanding "floating" deck not attached to the house. The permit fee for most decks under 250 square feet is a flat $75. A narrow exception exists: replacing deck boards only, with no work on stairs, joists, beams, or guardrails, and a total cost under $500, needs no permit. Guardrails are required starting at just 24 inches above grade, stricter than the 30 inch figure used in most states, and footings must reach 48 inches, among the deepest frost-protection depths in the country.

Source · Verified September 2026

Madison Building Department

Hours and procedures can change — call ahead to confirm.

How This Compares to Dane County

Madison's own rule is shown above (Permit required). Here is the separate rule that applies at the county level, for context:

Municipal (Wisconsin Uniform Dwelling Code, administered loc

The City of Madison requires a building permit to construct any deck a person will stand on, including floating decks, with no size exemption. Footings must extend 48 inches deep to meet the region's frost depth, guardrails are required starting at 2 feet above grade with a minimum height of 36 inches, and deck board replacement projects under $500 in value are permit-exempt.

See the full county page

Nearby Cities with Verified Rules

Other cities near Madison with a confirmed deck construction rule:

FAQs

Building It Yourself? Here's What You'll Need

Popular tools and materials homeowners use for a deck construction project:

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