Do I need a shed permit in Illinois?

In Illinois it depends on the size of the job. Permits are issued locally, so the answer comes from your Illinois city or county rather than a single statewide rule. Of the 2 Illinois jurisdictions we have verified for shed work, 0 require a permit outright, 2 depend on the size or scope of the job, and 0 require none.

Is there a shed permit exemption in Illinois?

2 of the 2 Illinois jurisdictions we cover set a threshold rather than a flat rule, so the same job can be exempt in one Illinois county and permitted in the next. The table above lists each Illinois jurisdiction's published threshold in its own words, with the source and the date we verified it.

Illinois

Do you need a shed permit in Illinois?

By Mario Bailey Last checked 15 Aug 2026

Always required: 0; of 2 jurisdictions
Conditional: 2; depends on size or scope
Not required: 0; exempt outright

Shed Permit rules nationwide, beyond Illinois.

A fenced backyard with a lawn and a small storage shed

Requirements and size thresholds for shed permits vary by locality. The table below compares what each Illinois county or city requires. Always confirm with the local office before starting.

Comparing states? See shed permit rules across every locality we cover.

The application steps and inspection sequence for shed permits come from the model code rather than from Illinois law, so they read the same wherever you build. We keep that walkthrough in one place: how a shed permit application and its inspections work, start to finish. What changes between Illinois jurisdictions is below: who requires a permit, what they charge, and which office you file with.

Swipe sideways to see thresholds and confidence.

Locality	Permit required?	Typical threshold	Confidence
Chicago	Conditional	single-story detached tool or storage shed under 150 sq ft and not more than 15 ft tall with no plumbing does not require a permit	From an official source
Cook County	Conditional	prefabricated storage containers	Confirmed on official page
No localities match your filter.

Common questions about shed permits in Illinois

Do I need a shed permit in Illinois?: In Illinois it depends on the size of the job. Permits are issued locally, so the answer comes from your Illinois city or county rather than a single statewide rule. Of the 2 Illinois jurisdictions we have verified for shed work, 0 require a permit outright, 2 depend on the size or scope of the job, and 0 require none.
Is there a shed permit exemption in Illinois?: 2 of the 2 Illinois jurisdictions we cover set a threshold rather than a flat rule, so the same job can be exempt in one Illinois county and permitted in the next. The table above lists each Illinois jurisdiction's published threshold in its own words, with the source and the date we verified it.

Do you need a shed permit in Illinois?

Common questions about shed permits in Illinois

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