On this page 5
§ 02
When a permit is required
Permit triggers and exempt work for Lake County
New structures, additions, structural alterations, decks, and pools
Sheds ≤ 100 sq. ft. (require Registration, but not full permit)
Minor cosmetic maintenance
- Exempt Sheds ≤ 100 sq. ft. (require Registration, but not full permit)
- Exempt Minor cosmetic maintenance
Note: Verify exemptions with Lake County Planning, Building & Development
Required documents
- Completed permit application or registration form
- Site plan/plat of survey
- Architectural drawings
- Contractor information
- Building code
- As of July 12, 2025: 2024 IBC, 2024 IRC, 2024 IEBC, 2024 IMC, 2024 IFGC, 2024 IFC, 2024 ISPSC, 2023 NEC, Illinois Plumbing Code. (Exceeds PA 103-0510 baseline). Special Requirements: Bird-friendly design (80% bird-friendly glass for residential < 100 ft.); EV-capable parking space for new homes
- Contractor requirements
- Contractors must be properly licensed and insured
§ 03
Application process
Typical processing: Varies; contact department
- 01 Apply via the Land Development Portal
- 02 Determine if project requires a full Permit or a simplified Registration (e.g., roofing/siding)
- 03 Submit site plan (plat of survey), architectural drawings, and contractor info
- 04 Compliance with Watershed Development Ordinance (WDO) is mandatory
- 05 Projects on private wells/septic require Health Department approval
- 06 Pay fees and receive permit or registration
Typical processing time: Varies; contact department
§ 04
Required inspections
Scheduling and sequence
How to schedule
- Online portal (online)
- (847) 377-2600 (phone)
- Inspection hours
- Standard business hours
Typical sequence: Mandatory inspections at critical milestones
§ 05
Frequently asked
Common questions about unincorporated Lake County permits
01 Do I need a building permit in unincorporated Lake County, IL? ▸
New structures, additions, structural alterations, decks, and pools
02 How do I apply for a building permit in unincorporated Lake County, IL? ▸
To apply for a building permit in unincorporated Lake County, IL, follow these steps: 1. Apply via the Land Development Portal 2. Determine if project requires a full Permit or a simplified Registration (e.g., roofing/siding) 3. Submit site plan (plat of survey), architectural drawings, and contractor info 4. Compliance with Watershed Development Ordinance (WDO) is mandatory 5. Projects on private wells/septic require Health Department approval 6. Pay fees and receive permit or registration
03 How long does it take to get a building permit in unincorporated Lake County, IL? ▸
Building permit processing times in unincorporated Lake County, IL typically run Varies; contact department. Timelines can vary based on project complexity and current department workload.
04 What work is exempt from building permits in unincorporated Lake County, IL? ▸
Not all construction work requires a permit in unincorporated Lake County, IL. The following work is generally exempt: Sheds ≤ 100 sq. ft. (require Registration, but not full permit); Minor cosmetic maintenance. Note: Verify exemptions with Lake County Planning, Building & Development When in doubt, confirm with the local building department before starting work.
05 How do I schedule a building inspection in unincorporated Lake County, IL? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Lake County, IL via: Online portal, (847) 377-2600.
last verified April 2026
source Lake County Planning, Building & Development ↗
entry id permits/illinois/lake/unincorporated
Educational reference. Permit rules and fees change — confirm current requirements directly with Lake County Planning, Building & Development before applying. Jaspector is not legal advice.