Chicago Deck Permit

What's Required in Chicago

• Deck Permits in Chicago are regulated by the City of Chicago Department of Buildings
• Work must be performed by a licensed Illinois contractor
• Plans must be filed through Chicago's eBUILD online portal
• Inspections are required at key stages of construction
• Final inspection required before project occupancy/use
• Contractor must hold appropriate trade licenses

When a Deck Needs a Permit in Chicago

Whether a deck needs a building permit in Chicago usually comes down to how high and how big it is. Low, ground-level platforms are often exempt, while raised decks need a permit — many cities draw the line at decks more than about 30 inches above grade (where guardrails and footings come into play), but Chicago’s exact threshold is set by the Chicago Dept. of Buildings. Attached decks almost always require a permit because they tie into the house’s structure, and even a freestanding deck usually needs one once it passes the size or height cutoff. Check the requirements above before you build, and note that zoning setbacks from property lines apply regardless.

Do You Need a Permit to Repair or Replace a Deck in Chicago

It depends on how much you’re changing. Swapping worn decking boards or railing on the same layout is usually treated as maintenance and often doesn’t require a permit in Chicago. But replacing the structural framing (joists, beams, posts, or footings), rebuilding the deck, enlarging it, or changing its height generally does — at that point it’s regulated like new construction. When in doubt, describe the scope to the Chicago Dept. of Buildings before starting; the requirements above outline what Chicago expects.

How to Get a Deck Permit in Chicago

Frequently Asked Questions