Do I need a permit for standby generator installation in Chicago?
Yes. In Illinois, standby generator installation generally requires a permit, and Chicago is no exception.
A permanently installed standby generator requires a permit: the electrical work (new circuits, service, or transfer switch) must be permitted and done by a licensed general electrical contractor under the 2018 Chicago Electrical Code, and any hardwired connection is not exempt. Natural-gas fuel piping is plumbing work under the Chicago Fuel Gas and Plumbing Codes and must be done by a licensed plumbing contractor; a portable cord-and-plug generator not tied into the building wiring or a fixed gas line does not need a permit. Legally required standby generator systems (for example in high-rise residential buildings) must be designed with plans under Chicago Building Code Section 14E-7-701 and are subject to a Department of Buildings generator test/inspection. A permanently installed standby generator requires both electrical and often mechanical/gas permits in most Illinois jurisdictions. Many local codes enforce clearance and location rules and require a listed automatic transfer switch under the adopted National Electrical Code.
Documents you may need
- Building permit application covering the generator (electrical service/transfer switch and gas connection)required
- Licensed general electrical contractor information for the wiring and transfer switchrequired
- Licensed plumbing contractor information for natural-gas pipingSometimes required
- Plans/specifications by an Illinois-licensed architect or engineer (for a legally required standby system or complex install)Sometimes required
- Site plan showing generator location and clearancesrequired
- Electrical single-line and transfer switch detailsrequired
- Gas connection details (natural gas or propane)Likely required
- Equipment spec sheetSometimes required
Possible inspections
- Electrical inspection of the transfer switch and wiring
- Gas piping inspection (if fueled by natural gas)
- Final generator inspection/test by the Department of Buildings
- Electrical rough inspection
- Gas/fuel connection inspection
- Final inspection
Frequently asked questions
- Do I need a permit for standby generator installation in Chicago?
- Yes. In Illinois, standby generator installation generally requires a permit, and Chicago is no exception. A permanently installed standby generator requires a permit: the electrical work (new circuits, service, or transfer switch) must be permitted and done by a licensed general electrical contractor under the 2018 Chicago Electrical Code, and any hardwired connection is not exempt. Natural-gas fuel piping is plumbing work under the Chicago Fuel Gas and Plumbing Codes and must be done by a licensed plumbing contractor; a portable cord-and-plug generator not tied into the building wiring or a fixed gas line does not need a permit. Legally required standby generator systems (for example in high-rise residential buildings) must be designed with plans under Chicago Building Code Section 14E-7-701 and are subject to a Department of Buildings generator test/inspection. A permanently installed standby generator requires both electrical and often mechanical/gas permits in most Illinois jurisdictions. Many local codes enforce clearance and location rules and require a listed automatic transfer switch under the adopted National Electrical Code.
- Who issues the permit in Chicago?
- The local building department for Chicago 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.