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§ 02
When a permit is required
Permit triggers and exempt work for DeKalb County
New construction, additions, alterations, decks, sheds, fences, solar panels, and major repairs.
One-story detached accessory structures 120 sq. ft. or less (still must meet setbacks)
Fences 3 feet or less in height (front yard)
Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work
Swings and other playground equipment
Window awnings supported by an exterior wall
- Exempt One-story detached accessory structures 120 sq. ft. or less (still must meet setbacks)
- Exempt Fences 3 feet or less in height (front yard)
- Exempt Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work
- Exempt Swings and other playground equipment
- Exempt Window awnings supported by an exterior wall
Required documents
- Permit Application
- Plat of Survey
- Building Plans
- Health Department approval (if applicable)
- Notarized Letters of Intent from licensed trades
- Building code
- 2021 IRC, 2021 IBC, 2023 NEC (State mandate), 2014 Illinois Plumbing Code
- Permit validity
- Construction must start within 180 days; valid for 12 months. Void if no inspections for 180 days.
- Owner-builder
- Owners may perform work on their own primary residence; still requires permits and inspections.
- Contractor requirements
- Plumbers and Roofers must provide state license numbers. Electricians must be licensed by a municipality that tests.
§ 03
Application process
Typical processing: 1 to 3 weeks
- 01 Determine if a permit is required for the specific project.
- 02 Complete the Permit Application form (available on website).
- 03 Submit two sets of building plans and a Plat of Survey showing proposed improvements.
- 04 For projects with well/septic, obtain Health Department approval first (815-758-6673).
- 05 Submit Notarized Letters of Intent from licensed trades (Plumbing, Electrical, Roofing, HVAC).
- 06 Pay application fee.
- 07 Undergo Zoning Review and Site Inspection (stakes must be in place).
- 08 Permit issuance following plan approval (typically 1-3 weeks).
Typical processing time: 1 to 3 weeks
§ 04
Fee schedule
DeKalb County building permit fees
Fee type
Amount
01
Minimum permit fee
$50
02
Plan check fee
Included in permit fee for most residential; separate for commercial
03
Permit fee formula
Combination of flat fees (sheds/decks) and square footage/valuation for larger structures
04
Reinspection fee
$50 per failed inspection
05
Penalty (no permit)
Double fees if work starts without permit
Checks or credit cards (with service fee) accepted
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- 815-895-7188 (phone)
- Scheduling deadline
- Call at least 24 hours in advance
- Inspection hours
- Monday - Friday, business hours
Typical sequence: Footing, Foundation/Walls, Framing/Rough-in (Elec/Plumb/HVAC), Insulation, Final
§ 06
Frequently asked
Common questions about unincorporated DeKalb County permits
01 Do I need a building permit in unincorporated DeKalb County, IL? ▸
New construction, additions, alterations, decks, sheds, fences, solar panels, and major repairs.
02 How much does a building permit cost in unincorporated DeKalb County, IL? ▸
Building permit fees in unincorporated DeKalb County, IL are set by the local building department and vary by project type and valuation. The minimum permit fee is $50. Fees are calculated as: Combination of flat fees (sheds/decks) and square footage/valuation for larger structures. Plan check fee: Included in permit fee for most residential; separate for commercial.
03 How do I apply for a building permit in unincorporated DeKalb County, IL? ▸
To apply for a building permit in unincorporated DeKalb County, IL, follow these steps: 1. Determine if a permit is required for the specific project. 2. Complete the Permit Application form (available on website). 3. Submit two sets of building plans and a Plat of Survey showing proposed improvements. 4. For projects with well/septic, obtain Health Department approval first (815-758-6673). 5. Submit Notarized Letters of Intent from licensed trades (Plumbing, Electrical, Roofing, HVAC). 6. Pay application fee. 7. Undergo Zoning Review and Site Inspection (stakes must be in place). 8. Permit issuance following plan approval (typically 1-3 weeks).
04 How long does it take to get a building permit in unincorporated DeKalb County, IL? ▸
Building permit processing times in unincorporated DeKalb County, IL typically run 1 to 3 weeks. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in unincorporated DeKalb County, IL? ▸
Not all construction work requires a permit in unincorporated DeKalb County, IL. The following work is generally exempt: One-story detached accessory structures 120 sq. ft. or less (still must meet setbacks); Fences 3 feet or less in height (front yard); Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work; Swings and other playground equipment; Window awnings supported by an exterior wall. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in unincorporated DeKalb County, IL? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated DeKalb County, IL via: 815-895-7188. Call at least 24 hours in advance.
last verified April 2026
source DeKalb County Community Development Department ↗
entry id permits/illinois/dekalb/dekalb-county
Educational reference. Permit rules and fees change — confirm current requirements directly with DeKalb County Community Development Department before applying. Jaspector is not legal advice.