How a Madison deck project usually starts
Height is the first fork in the road. Under three feet, a Madison deck can usually run to the lot line; at three feet or more, setbacks and a site plan come in. After that come footings, materials and who will build it. Describe the project and an independent builder can call you.
Deck projects
Dane County permit pages we checked
These quote each city’s own permit page or fee schedule. Villages and other cities set their own rules.
Price check
See the Madison deck cost guide for 2026 published price ranges and permit fees from Madison and Verona.
Frost, footings and the inspection
Madison says deck footings must be at least 48 inches deep to prevent frost heaving, and that you schedule an inspection after digging the holes and before installing the footings. Middleton and Fitchburg also inspect footings before concrete.
The state appendix adds detail: concrete of at least 3,000 psi, each post over the middle third of its footing, and a footing within 5 feet of the house wall set at the same elevation as the house footing.
Sources: City of Madison Development Services Center, Decks · City of Middleton, Building Inspections & Building Permits · City of Fitchburg Building Inspection, Permit Requirements · Wisconsin Uniform Dwelling Code, SPS 325 Appendix B. Checked November 9, 2026. Confirm current requirements with your building inspector.
Towns around Madison
Madison deck FAQ
Who builds the deck?
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.
Do I need a permit in Madison?
Yes. The City of Madison says you need a permit to build a deck. Most decks under 250 square feet cost $75, and the city can issue the permit on the spot if the plans meet code.
Can I replace boards myself without a permit?
In Madison, yes, if the cost is under $500. Work on stairs, joists, beams, columns or guardrails needs a permit or a check with Building Inspection.
How close to the lot line can I build?
In Madison, decks under three feet can reach the lot line in most cases. In Sun Prairie, decks up to 3 feet may come within 8 feet of the rear line, and taller ones must stay 24 feet back.
How deep are Madison deck footings?
At least 48 inches, according to the city, to prevent frost heaving. An inspector checks the holes before the footings go in.