Do I Need a Permit for a Shed in Madison, WI?

Direct Answer: In Madison, the Building Inspection Division (part of the Development Services Center, under the Department of Planning & Community and Economic Development) issues shed permits under Madison General Ordinances Chapter 28 (the Zoning Code), applied alongside the fire-separation rule in Wisconsin's statewide Uniform Dwelling Code. A shed that is 150 square feet or smaller, unheated, and set at least 10 feet from any dwelling on the same lot does not need a building permit — but it still has to meet the city's setback, height, and footprint rules. Anything bigger, heated, closer than 10 feet to the house, or built elsewhere and moved onto the lot needs a permit reviewed by both Zoning staff and Building Inspection before construction starts.

Verified against official municipal and state sources: July 13, 2026. Requirements change — confirm with the City of Madison before applying.

Key Takeaways

• Sheds 150 sq ft or smaller, unheated, and at least 10 feet from any dwelling unit on the lot are exempt from a building permit — but must still follow zoning placement rules (City of Madison, New Shed).
• All accessory buildings on a lot combined — sheds, detached garages, and similar structures — are capped at 1,000 sq ft of footprint, and maximum height is 15 feet, measured from grade to the midpoint between the eave and the roof peak (New Shed).
• A shed must sit at least 3 feet from the house and other structures and at least 3 feet from rear or side lot lines, with fire separation required if it's closer than 10 feet to the house (New Shed).
• Wisconsin's statewide Uniform Dwelling Code (SPS 320–325) exempts detached accessory buildings like sheds from most UDC provisions, except the fire-separation requirement in SPS 321.08(1) — which is exactly why Madison enforces that 10-foot separation rule (Wis. Admin. Code SPS 320).
• A permit-eligible shed pays an accessory-building permit fee of $0.06 per square foot (minimum $25) plus a separate zoning review fee of $0.03 per square foot (minimum $25) (Building Inspection Fees).
• Permit and site-plan review both run through the Development Services Center — you schedule an appointment rather than walking up to a same-day counter (Permits).

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The Practical Rule

Madison's shed rule is a size-and-distance test, not a flat exemption. A shed clears the no-permit path only if it satisfies all three conditions at once: 150 square feet or less, unheated, and at least 10 feet from every dwelling unit on the property (including your own house and any accessory dwelling unit). Miss any one of those — say, a 200-square-foot shed, or a 120-square-foot shed with a small electric heater, or a shed tucked 6 feet from the back door — and you need a building permit. Prefabricated sheds and structures built elsewhere and moved onto the lot always need a permit, regardless of size, because the city hasn't reviewed them for placement or wind/snow load until they're sited. Even a permit-exempt shed is not exempt from zoning: setbacks, height, and the citywide 1,000-square-foot accessory-building cap apply either way, and code enforcement can still cite a shed that's placed illegally even if no permit was required to build it.

What to Check Before You Build

1. Confirm you're inside Madison city limits, not a bordering town. Fitchburg, Middleton, Monona, and the surrounding towns each run their own permitting, separate from the City of Madison's Building Inspection Division.
2. Find your zoning district and lot lines. Setback and accessory-structure rules vary somewhat by district; the Development Services Center or Zoning staff (608-266-4551 ext. 3, zoning@cityofmadison.com) can confirm your district and any overlay (shoreland, historic, floodplain) that adds requirements.
3. Add up your existing accessory-building footprint. If you already have a detached garage or another shed, its square footage counts against the 1,000-square-foot combined cap before your new shed does.
4. Measure the real distances, not estimates: 3 feet minimum to the house and other structures, 3 feet minimum to rear/side lot lines, and 10 feet to any dwelling unit if you want to skip the fire-separation requirement and, for small sheds, the permit itself.
5. Check your deed, plat, or HOA covenants for private setback or placement restrictions — the city's zoning rules are a floor, not a ceiling, and a subdivision covenant can be stricter than MGO Chapter 28.

Setbacks, Height & the 1,000-Sq-Ft Accessory-Building Cap

Madison's setback minimums for sheds and other accessory structures are 3 feet from the principal house or other structures and 3 feet from rear or side lot lines, with corner lots and irregularly shaped lots subject to different — usually stricter — placement rules that Zoning staff should confirm before you finalize a site plan (New Shed). Placing a shed in the rear 40 feet of the lot generally lines up with the zoning rules for most residential districts, but side-yard placement often requires more than the 3-foot minimum, so it's worth a call to Zoning (608-266-4551 ext. 3) before you pour a pad or order materials. Height is capped at 15 feet, measured from grade to the midpoint between the eave and the roof peak, and the combined footprint of every accessory building on the lot — all sheds and detached garages together — cannot exceed 1,000 square feet without a conditional-use approval. The zoning framework sits in Madison General Ordinances Chapter 28, the city's Zoning Code, which the Building Inspection Division and Zoning staff jointly administer (MGO Ch. 28, Zoning Code).

Fees, State Code Context & How to Apply

Sheds fall outside most of the Wisconsin Uniform Dwelling Code (SPS 320–325), the state code that otherwise governs one- and two-family dwelling construction statewide — detached accessory buildings are broadly exempt except for the SPS 321.08(1) fire-separation standard, which is the state-law basis for Madison's 10-foot rule (Wis. Admin. Code SPS 320). For a permit-eligible shed in Madison, budget for two line items: the accessory-building permit fee ($0.06 per square foot, minimum $25) and the zoning review fee ($0.03 per square foot, minimum $25), both listed on the city's fee schedule (Building Inspection Fees). To apply: determine your zoning classification, prepare a site plan showing the shed's dimensions and its distance to the house, other structures, and lot lines, then submit through the city's online permitting system or in person by appointment at the Development Services Center, 215 Martin Luther King Jr. Blvd. (Permits). Once the permit and zoning review clear, display the permit during construction and schedule the required inspections through Building Inspection (608-266-4551 ext. 1) before you close up the structure (Inspections).

Frequently Asked Questions

Does a small shed under 150 square feet need a permit in Madison?

Not automatically. It's exempt from a building permit only if it's also unheated and set at least 10 feet from every dwelling unit on the lot. If any of those conditions isn't met, you need a permit regardless of the shed's size.

Do I still need to follow setback rules if my shed is permit-exempt?

Yes. The 150-square-foot/unheated/10-foot exemption applies only to the building permit requirement. Every shed, exempt or not, still has to meet Madison's zoning setbacks, height limit, and the citywide 1,000-square-foot accessory-building cap.

How close to my property line can I put a shed in Madison?

The city's general minimum is 3 feet from rear or side lot lines and 3 feet from the house or other structures, but corner lots, irregular lots, and side-yard placement can require more. Confirm your specific setback with Zoning staff (608-266-4551 ext. 3) before finalizing a site plan.

Does Wisconsin's Uniform Dwelling Code apply to my shed?

Mostly no. The statewide UDC (SPS 320–325) exempts detached accessory buildings like sheds and garages from nearly all of its provisions, with one exception: the fire-separation standard in SPS 321.08(1), which is why Madison requires extra separation or fire-rated construction when a shed sits closer than 10 feet to the house.

Does a shed I buy prefabricated and have delivered need a permit?

Yes. Prefabricated sheds and structures moved onto a lot from elsewhere always require a permit in Madison, even if they'd otherwise be small enough to qualify for the no-permit path if built on-site.

Does my existing detached garage count against my new shed's size limit?

Yes. Madison caps the combined footprint of all accessory buildings — sheds and detached garages together — at 1,000 square feet per lot. A larger footprint needs a conditional-use approval, not a standard permit.

Verify Your Address

Setback distances, the accessory-building footprint cap, and fee amounts can change, and corner lots, overlay districts, and shared property lines each add wrinkles a general guide can't fully capture. Before you order materials, check GovCodex's Madison, WI permit catalog for the permit types tied to your project, or run a permit check to see what your specific address and shed plan actually require. For more on Wisconsin's statewide building framework, see Wisconsin's Uniform Dwelling Code, explained and the Madison building permit guide. For the setback concept generally, see what is a setback in zoning, and for garages specifically, can I build a garage or shed in my backyard.