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PermitRoadmap

Do I need a permit for accessory dwelling unit (adu) in Streamwood?

Permit likely required

Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Illinois. Confirm the specifics with Streamwood.

Illinois has no statewide law requiring cities or counties to allow accessory dwellings. HB 1813, the Accessory Dwelling Unit Permissibility Act, was re-referred to the House Rules Committee and did not become law, so local zoning still decides whether an ADU is allowed. The Illinois Energy Conservation Code applies to new residential buildings statewide, and where a local government does not regulate energy standards, construction is still subject to the Energy Efficient Building Act (20 ILCS 3125/20). The Smoke Detector Act requires hardwired, interconnected smoke detectors with battery or generator backup in any dwelling unit newly constructed, reconstructed or substantially remodeled (425 ILCS 60/3(f)).

Get the checklist for your accessory dwelling unit (adu) in Streamwood. A free check first, then a free printable Permit Prep Pack.

Documents you may need

  • Building permit applicationLikely required
  • Plat of survey or site plan showing the unit, setbacks, lot coverage and utility routesLikely required
  • Construction drawings with floor plan, foundation, framing and energy code complianceLikely required
  • Zoning approval confirming an accessory dwelling is allowed on the lotLikely required
  • Plumbing permit and licensed plumber informationLikely required

Possible inspections

  • Footing and foundation inspection
  • Framing and rough electrical, plumbing and mechanical inspections
  • Insulation inspection
  • Final inspection and occupancy approval

Frequently asked questions

Do I need a permit for accessory dwelling unit (adu) in Streamwood?
Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Illinois. Confirm the specifics with Streamwood. The documents and inspections sections on this page list what the building department typically asks for.
Who issues the permit in Streamwood?
The local building department for Streamwood handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
How do I find out the exact requirements for my project?
Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.

PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.