ADU rules in Des Plaines, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Illinois has no statewide ADU mandate. Des Plaines zoning limits accessory structures to 225 sq ft for non-garage structures. ADU approval requires zoning review.
Illinois has no statewide ADU mandate. Des Plaines MC §12-8-1 (Zoning) limits accessory structures: detached garage or carport maximum 720 sq ft; other accessory structures maximum 225 sq ft. Full ADUs may be difficult without a variance given the 225 sq ft cap on non-garage structures. Contact the Community & Economic Development Department at 847-391-5380 for ADU feasibility and variance process guidance.
Using an accessory structure as a dwelling without proper zoning approval violates the zoning code and is subject to fines up to $750 per offense.
Des Plaines, IL
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Side-by-side rule comparisons with other cities in Cook County.
See how other cities in Cook County handle adu rules.
See how Des Plaines's adu rules rules stack up against other locations.
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