Alterations & Additions

Site Development Permit for Alterations/Additions
A Site Development Permit may be required for alterations and additions. Applicability will be determined by the staff at the time of application for a Building Permit. A Building Permit is required for alterations and additions.

Alterations and Additions may include projects such as:
  • Alterations to a Detached Garage in Floodplain
  • Breezeway
  • Deck/Patio
  • First Floor Footprint Changes
  • Remodeling
  • Roof Line Changes
  • Second Floor Additions
What Do I Need?
  1. Address or the Property Index Number (PIN)
  2. Site Plan and Topographic Survey/Grading Plan requirements:
    • Three (3) complete sets including septic design, if applicable. The plans must be signed and sealed by a professional engineer or a certified surveyor of the State of Illinois.
    • An additional two (2) sets if a building permit is being reviewed concurrently.
    • Three (3) complete sets of revised documents, if revisions are required. An additional two (2) sets are required if a building permit is being reviewed concurrently.
    • Two (2) additional sets of building plans (architectural drawings); if the site contains a floodplain areas
  3. Health Department approval if the site contains a septic system (Individual Sewage Disposal (ISD) system) The ISD permit can be applied for and reviewed concurrently with the Site Development Permit.
  4. An elevation certificate may be required.
  5. Driveway access approval from the appropriate highway authority such as: Township Highway Commission (PDF), Lake County Division of Transportation (LCDOT), Illinois Department of Transportation (IDOT), private road governing authority.
  6. Permit fees are required at the time of application. A check, cash, credit/debit card are accepted. Additional fees may be required for a Wetland Jurisdiction Determination (JD).
Your site may be inspected at anytime and it must be in compliance with the Unified Development Ordinance and the approved engineering plans at all times. Please see the list of required inspections.