Building Permits

Permits are required for many remodeling projects, repairs, replacements, new structures, and additions. Before starting any home improvement project, please contact the Inspectional Services Division at 630-823-5860 or Email Inspectional Services for permit requirements. Please remember to complete a building permit before starting any work. If you start work without a building permit, you are subject to a permit penalty and Village personnel have no other alternative than to stop work on your project. You can print a copy of the appropriate Building Permit Requirements for your project, below under Guides & Publications. You can also apply for a permit online by clicking on the link below.


List of Common Construction Projects

Some of the common construction projects are listed below. Contact Inspectional Services at 630.823-5860 if you have any questions.

  • For accessory structures, remodeling, and room additions, please use the building permit form found under Guides & Publications.

Guides & Publications

  1. Accessible Parking
  2. Building Permit Application (PDF)
  3. Contractor Registration Requirements
  4. Decks
  5. Detached Garage
  6. Driveways
  7. Electric Service Upgrades
  8. Electric Vehicle Charging Station
  9. Energy Conservation
  10. Fences
  11. Flag Pole Requirements
  12. Furnace and A/C units
  13. Low Voltage Alarms
  14. Mailbox Installation
  1. New* Knox Residential HomeBox Available
  2. Patios, Service Walks, Stoops
  3. Permanent Signs
  4. Residential Remodel and Additions
  5. Roofs
  6. Sanitary Sewer Repairs
  7. Sheds
  8. Solar Permitting Guidelines
  9. Swimming Pools
  10. Temporary Signs
  11. Temporary Tent
  12. Water Heater
  13. Windows

Tools and Calculators



When to Start Home Improvement Projects

Work on a home improvement project may commence only after a building permit has been issued. To show a permit has been obtained for the work, please display the permit placard in a window so it is visible from the street throughout the entire project.

Handouts for Projects Regulations

The Inspectional Services Division has many helpful handouts specifying general regulations for many of the projects listed above.  Handouts are available for decks, patios, driveways, swimming pools, detached garages, sheds, and others. Please contact Inspectional Services to see if a handout is available for your project.