Do You Need a Site Plan in Illinois?
Yes. In Illinois, virtually all exterior residential construction—including new home builds, structural additions, detached garages, storage sheds, inground swimming pools, and attached decks—mandates the submission of a scaled site plan or plot plan.
> Notice: This site plan maker online webtool produces preliminary, conceptual site plans for permit applications where local ordinances allow homeowner or contractor-prepared drawings. It does not replace a licensed land survey or supply a structural engineer's seal. Always verify local survey submission standards with your municipal building department.
---
What Makes Illinois Permitting Different
Understanding these four regulatory factors will keep your Illinois permit on schedule:
1. The Municipal Plat of Survey Standard
In many states, property lines can be imported from county GIS layers for simple deck or shed permits. In Illinois, many suburban building departments explicitly mandate a certified Plat of Survey prepared by an Illinois Professional Land Surveyor.
- The plat must show iron property pins staked in the ground.
- It must document precise angles, property line bearings, and recorded easements.
- Certain jurisdictions (like Algonquin) also require an as-built spot survey after foundation footings are poured before framing inspections can proceed.
2. State Law SB4063: The 15-Day Review Guarantee
Under Illinois Public Act 103-0511 (SB4063), Illinois municipalities must complete the initial plan review for one-family and two-family residential permit applications within 15 business days. If a municipal department fails to meet this statutory timeline, property owners and contractors are legally empowered to retain an independent qualified third-party plan reviewer to approve the drawings, preventing municipal administrative backlogs from stalling construction schedules.
3. City of Chicago Design Mandates
The City of Chicago operates entirely under the Chicago Construction Codes. All plan-based building permit applications require drawings prepared, stamped, and signed by an Illinois-licensed architect or structural engineer. However, Chicago homeowners are legally entitled to pull permits and perform work on their own primary residence (single-family or two-unit buildings) without a general contractor license.
4. Absence of a Statewide Contractor License
Illinois has no statewide general contractor license. Instead, licensing and registration are managed at the municipal level. Contractors must register individually with each municipality, provide proof of surety bonds and general liability insurance, and adhere to local trade regulations.
---
What Illinois Building Departments Require on a Site Plan
Whether you are applying in Cook, DuPage, Lake, Will, Kane, or McHenry counties, municipal plan reviewers assess drawings against these essential elements:
| Status | Requirement |
|---|---|
| ☐ | Property Boundaries with Lot Dimensions and Line Bearings |
| ☐ | Permanent Index Number (PIN / Parcel Tax ID) |
| ☐ | Full Legal Description (Subdivision, Lot, Block, Recording Data) |
| ☐ | Iron Monument Pins Indicated at Property Corners |
| ☐ | Existing Structures (House Footprint, Garages, Sheds, Hardscapes) |
| ☐ | Proposed Construction Dimensions, Gross Floor Area, & Use |
| ☐ | Front, Rear, Interior Side, & Corner Side Yard Setbacks |
| ☐ | Distance from Structures to Public Road Centerlines / Alley Lines |
| ☐ | Top of Foundation Elevation Relative to Established Street Curb |
| ☐ | Direction of Surface Runoff & Stormwater Drainage Arrows |
| ☐ | Public Utility & Drainage Easements (PUE / DE) Clearly Delineated |
| ☐ | Location of FEMA Floodplains, Wetlands, or Retention Basins |
| ☐ | Standard Scale (e.g., 1"=20', 1/8"=1') and Directional North Arrow |
Essential Scale and Paper Size Standards
- Standard Scale: Most municipalities require site plans drawn at an engineer scale of 1 inch = 20 feet (or 1/8 inch = 1 foot).
- Hard Copy vs. Digital: Cook County and Chicago now mandate vector PDF digital submissions. Municipalities requiring physical copies generally accept 11″ × 17″ prints for residential additions and accessory structures.
---
Key Illinois Municipalities & County Regulations
1. City of Chicago
- System: Administered by the Department of Buildings (DOB) via the dynamic e-plan review system.
- Site Plan Specifics: Must show exact building footprints, number of stories, primary use, curb cuts, private drive aisles, public alley centerlines, trash enclosures, and parkway trees. Setbacks in residential districts frequently require a minimum 28-to-30-foot setback measured directly from the alley centerline.
2. Cook County (Unincorporated)
- Authority: Department of Building and Zoning.
- Survey Rule: For accessory buildings measuring 625 square feet or greater, a certified property boundary survey less than 5 years old is strictly required. All permits must be submitted via the Cook County digital portal.
3. McHenry County
- Framework: In unincorporated McHenry County, the Planning and Development Department accepts homeowner-drafted site plans. The county offers a notable permit exemption for anchored accessory structures under 150 square feet.
- Reference Guide: Read our dedicated McHenry County site plan guide for local portal links, digital PDF rules, and UDO setback tables.
4. DuPage & Lake County Suburbs
- Stringent Survey Mandates: Suburbs like Naperville, Schaumburg, and Highland Park routinely require three certified copies of an original stamped plat of survey showing all easements of record and finished grading before releasing building permits.
---
Illinois Owner-Builder Rights and Responsibilities
Homeowners in Illinois enjoy strong owner-builder rights under local municipal codes:
- Primary Residence Work: You can act as your own general contractor for home additions, decks, garages, and interior renovations on your primary residence.
- Affidavit Filing: Most building departments require you to execute an owner-builder statement certifying that you own the property and will reside in the dwelling upon completion.
- Subcontractor Standards: While you can draft your own plot plan for jurisdictions that do not mandate a certified surveyor’s stamp, any third-party plumbing contractors you hire must hold a valid State of Illinois Plumbing License, and roofers must hold an active Illinois Roofing Contractor License.
---
Project-by-Project Guide for Illinois Projects
Explore our dedicated project guides to prepare your Illinois permit submittal:
- Fence Permit Site Plan: Verify sight triangles and property line setbacks (fences are often permitted right on property lines, but utility easement access must be respected).
- Deck Permit Site Plan: Ensure post footing piers extend below the mandatory 42-inch northern Illinois frost line.
- Shed Permit Site Plan: Understand local size exemption thresholds (often 120 to 150 sq ft) and accessory rear-yard setback buffers.
- Patio Site Plan: Map impervious surface area to ensure compliance with municipal stormwater lot coverage limits.
- Driveway Permit Site Plan: Diagram curb transitions, right-of-way boundaries, and driveway approach flares.
- Swimming Pool Permit Site Plan: Show 48-inch self-closing barrier fences, overhead powerline clearances, and pool equipment setbacks.
- Garage Permit Site Plan: Plan detached two-car garages and alley clearances in Chicago and suburban townships.
- Home Addition Site Plan: Draft ground-floor home expansions detailing existing foundations, new footings, and setback buffers.
- ADU Site Plan: Layout coach houses or backyard flats permitted under Chicago’s Additional Dwelling Unit ordinance.
---
Comparing Your Site Plan Preparation Paths in Illinois
| Preparation Method | Cost Range | Turnaround | Boundary Stamp Included? | Best Project Match |
|---|---|---|---|---|
| Our Site Plan Creator | Free First Draft / Self-Serve | Minutes | ❌ No | Sheds, decks, fences, preliminary addition layouts where survey waivers apply |
| Hand-Drawn Paper Sketch | Free | Several Hours | ❌ No | Rural downstate projects or fence permits in smaller cities |
| Local Draftsman | $300 – $750 | 1 – 2 Weeks | ❌ No | Detailed architectural additions needing custom structural framing sheets |
| SitePlans.us Custom Drafting | $129 – $199 | 1 – 3 Business Days | ❌ No | Expedited revisions after receiving municipal review redlines |
| Illinois-Licensed Land Surveyor | $700 – $2,000+ | 3 – 5 Weeks | ✅ Certified Seal | Subdivisions, new single-family homes, and suburbs mandating plats of survey |
---
How to Build Your Plan Using Our Site Plan Maker
With this site plan maker online webtool, you can assemble a clean, dimensioned layout in five steps:
- Enter Your Illinois Address: Our site plan creator imports available digital parcel boundaries and county GIS records.
Read full Guide how to How to Enter Property Address
- Review Boundaries & Structures: Inspect existing lot lines and the primary residence footprint.
Read full tutorial How to Check Selected Parcel
- Add Your Proposed Improvement: Draw your deck, shed, garage, or room addition to scale.
Support desk Tutorial on How to Add strucuture
- Dimension Setback Buffers: Check how to adjust labels to clearly display front, side, and rear yard setback lines without overlapping text.
- Finalize Title Block & Export: Use how to edit title sheets and how to clean property line labels to generate a clean, scaled PDF ready for portal submission.
---
Designed for Homeowners, General Contractors, and Commercial Pros
Our web app accommodates every property sector across Illinois:
- Site Plans for Homeowners: Eliminates drafting complexity for property owners needing a straightforward permit drawing.
- Site Plans for General Contractors: Keep client projects moving forward and produce instant revisions when municipal reviewers request plan tweaks.
- Site Plans for Builders And Developers: Standardize layout sheets across suburban infill lots and multi-lot developments.
- Site Plans for Commercial Real Estate: Generate conceptual site drawings, parking exhibits, and tenant improvement displays.
---
Pricing for Our Site Plan Creator Webtool
Choose the option tailored to your workload:
| Plan Tier | Price | Ideal For | Features Included |
|---|---|---|---|
| Starter Single Plan | $49 (One-time) | Homeowners tackling a single outdoor project | High-resolution PDF export, full dimensional editing, setback callouts |
| Professional Pack | $69 / month | Busy remodelers, deck builders, fence contractors | 5 plan exports per month, multi-project storage, priority support |
| Unlimited Contractor | $299 / month | High-volume general contractors & design-build firms | Unlimited PDF plan generation, custom branding, priority chat support |
Need enterprise GIS data pipelines, multi-seat team management, or custom API access?
For Enterprise deals contact sales@siteplans.ai
---
Common Permitting Pitfalls in Illinois
- Submitting a Hand-Drawn Sketch When a Plat of Survey Is Required: In many Chicago suburbs, submitting an uncertified drawing will result in immediate rejection at the intake desk.
- Ignoring the 42-Inch Frost Depth: Failing to specify pier footings extending at least 42 inches below grade for structural decks and additions.
- Failing to Account for Alley Centerline Setbacks: In Chicago and older suburbs, rear garages must measure setback distances from the center of the alley, not just the fence line.
- Overlooking Stormwater Retention Caps: Adding extensive patio pavers without checking municipal impervious surface maximums can trigger costly stormwater management reviews.
- Not Invoking SB4063 Review Protections: Permitting delays often stretch for months unless you hold municipal departments accountable to the 15-business-day review window.
---
Illinois Local Permitting Resources
- Illinois General Assembly Public Act 103-0511 (SB4063): ilga.gov — 15-day residential plan review statute.
- Illinois Professional Land Surveyors Association (IPLSA): iplsa.org — Directory of licensed surveyors.
- City of Chicago Department of Buildings: chicago.gov/buildings — Chicago Construction Codes and e-permits.
- Cook County Building & Zoning: cookcountyil.gov — Unincorporated Cook County permits.
- McHenry County Planning & Development: mchenrycountyil.gov — County zoning and building division.
---
Frequently Asked Questions
Does Illinois require a surveyor's stamp on every site plan?
No. Illinois state law does not mandate a surveyor’s seal for every project. However, many individual municipalities (especially in the Chicago metropolitan area) require a formal Plat of Survey prepared by an Illinois-licensed surveyor for new construction, additions, and accessory buildings. Smaller jurisdictions and unincorporated townships frequently accept homeowner-prepared plot plans.
What is Illinois SB4063?
Senate Bill 4063 (Public Act 103-0511) is an Illinois state law requiring municipal building departments to complete the initial plan review for one-family and two-family residential projects within 15 business days. If the municipality fails to meet this deadline, applicants can hire an independent third-party reviewer.
How deep do deck footings need to be in Illinois?
Building codes across northern and central Illinois require frost-protected footings to extend to a minimum depth of 42 inches below finished grade to prevent frost heave damage.
Can a homeowner pull a building permit in Chicago without a contractor?
Yes. Homeowners may pull permits and perform work on their own primary residence (single-family or two-unit dwellings) under Chicago’s owner-occupant provisions, though drawings for plan-based permits must still be prepared by a licensed design professional.
---
Ready to Generate Your Illinois Site Plan?
Check your municipality’s survey requirements, input your property address into our site plan creator webtool, drop your proposed structures, and download your scaled PDF in minutes.
Start My Illinois Site Plan Now →
Stuck on reviewer redlines or municipal plat comments? Send your plans to SitePlans.us for prompt, human-reviewed drafting support.