Do I need a permit for a small deck?

Any deck 30 inches or higher above grade requires a permit in Des Plaines. Low ground-level platforms (under 30 inches) without stairs or ledger boards are typically exempt. Frost-depth footings (42 inches in Des Plaines) are required if the deck is attached or elevated. Permit costs usually run $75–150 depending on deck size; add $200–400 if you need a site plan drawn.

How deep do deck footings need to be in Des Plaines?

Des Plaines' frost depth is 42 inches in the Chicago area. Deck footings must bottom out below this line to prevent frost heave. In practice, holes are typically dug 48–50 inches deep and backfilled with concrete to the frost line. If your contractor quotes 36 inches (the IRC national standard), they're not local-code-aware — Des Plaines enforces 42 inches. Footing inspections happen after digging and before concrete pour.

Can I pull an electrical permit myself if I own the home?

No. Illinois requires all electrical work (except outlet and switch replacement) to be performed and permitted by a licensed electrician holding an Illinois IDFPR license. Homeowner-builder exemptions do not cover electrical. The electrician pulls the electrical subpermit, not you. You coordinate timing and inspections, but the licensed electrician is the permit applicant.

How much does a permit cost in Des Plaines?

Permit fees vary by project type. Fences and water-heater swaps typically run $75–125. Electrical subpermits are $100–200. Decks cost $100–300 depending on size. Additions and major remodels cost 0.5–1.5% of project valuation, plus plan-review fees (typically $200–500). Call the Building Department or check the city's fee schedule online for exact pricing. Most routine permits are processed in 1–2 weeks; complex projects take 3–4 weeks for plan review.

Do I need a site plan to get a fence permit?

Yes. Des Plaines requires a site plan or sketch showing property lines, lot dimensions, and where the fence sits relative to the property line and any easements. The site plan doesn't need to be surveyor-drawn; a sketch with measurements from your deed works. Missing or inaccurate site plans are the #1 reason fence permits get delayed. If you're unsure about your exact property line or setbacks, spend $200–400 on a property-line survey before filing — it eliminates rejection risk.

What's the difference between a building permit and a subpermit?

A building permit covers the general scope of work (deck, addition, remodel). Electrical, plumbing, and mechanical subpermits cover the specialized trades. If you're finishing a basement, you file one building permit; the electrician files an electrical subpermit, the plumber files a plumbing subpermit, and the HVAC contractor files a mechanical subpermit. All are filed at the Building Department, but licensed trades pull their own subpermits. You coordinate scheduling and inspections.

Can I install a fence myself in Des Plaines, or do I need to hire a contractor?

You can install a fence yourself if you own the home. Des Plaines does not require a fence contractor's license. You pull the permit, do the work, and schedule an inspection. The inspector checks for frost-depth footings (42 inches), correct height (under 6 feet in residential zones unless a variance is granted), and setbacks from property lines. The inspection happens after the fence is up.

What happens if I build without a permit in Des Plaines?

Building without a permit is a code violation and can result in fines, stop-work orders, or demolition orders. If you later try to sell the home, a title search or inspection may uncover the unpermitted work, and the new buyer's lender will require the work to be either permitted retroactively (with inspection) or removed. Homeowner's insurance may deny claims related to unpermitted work. Always pull a permit upfront — the cost and time are trivial compared to the legal and financial risk.

How do I check the status of my permit in Des Plaines?

Use the Des Plaines online permit portal (accessible via the city website) to track status, upload documents, and view inspection schedules. If you filed in person, ask for a permit number and use it to search the portal. If the portal is slow or outdated, call the Building Department directly — staff can tell you whether your permit is in plan review, approved, or pending inspection.

Do I need a permit to replace my water heater in Des Plaines?

Usually yes. If the new unit is the same size and type as the old one and installed in the same location, some jurisdictions exempt it. Des Plaines typically requires a mechanical permit for water-heater replacement to verify proper venting, gas-line sizing (if applicable), and code compliance. Attic water heaters, relocations, and upsizing always require permits. Call the Building Department or check online — a water-heater swap is quick and inexpensive ($75–125), so just pull the permit.

Building Permits in Des Plaines, IL (2026)

Do I need a permit in Des Plaines, IL?

Des Plaines sits in Cook County's northern suburbs, straddling two climate zones and adopting the 2021 Illinois Building Code (which aligns with the 2021 IBC with state amendments). The City of Des Plaines Building Department enforces permits for structural work, electrical, plumbing, mechanical, and certain exterior projects. Most homeowners correctly assume that decks, additions, and room finishes need permits — and they do. What trips people up is the gray zone: water-heater swaps, attic insulation, fence heights, shed sizing. Those decisions depend on specifics: Is the water heater in an attic or basement? Is the fence in a front yard or a corner-lot sight triangle? Is the shed attached or freestanding? A 5-minute call to the Building Department before you start saves weeks of rework.

Des Plaines' frost depth of 42 inches (Chicago area) is deep enough that deck footings and fence posts must bottom out below grade — typically meaning holes 48 inches deep or deeper to account for frost heave. The city's glacial-till soils are dense and stable, which helps, but winter frost-heave pressure is real from November through April. Spring is peak inspection season; plan accordingly if you're rushing a project. The city processes routine permits (fences, water-heater swaps, some electrical) in 1–2 weeks over-the-counter. Complex projects (additions, major electrical) take 3–4 weeks for plan review.

Owner-builders can pull permits for owner-occupied single-family homes without a general contractor's license — but not for rental properties or commercial work. You'll still need licensed electricians and plumbers to sign off on their respective work; the city requires it, and your homeowner's insurance often backs it.

The Des Plaines Building Department operates Monday through Friday, 8 AM to 5 PM. They maintain an online permit portal for filing and tracking; verify the current URL and login requirements on the city's official website, as portals shift and update.

What's specific to Des Plaines permits

Des Plaines adopted the 2021 Illinois Building Code, which tracks the 2021 IBC closely but includes state-level amendments on energy efficiency, electrical, and plumbing. When a question doesn't have a clear local answer, the Illinois Building Code and then the IBC apply in that order. This matters for details like deck ledger fastening (state amendments tightened flashing requirements in 2018) and electrical service-entry clearances. If you're rebuilding or updating, ask the Building Department whether the older IRC or the 2021 code applies to your project — new construction uses 2021; existing building modifications sometimes follow older baselines depending on the scope.

The city's frost depth of 42 inches means deck footings and fence post holes must extend below that line to avoid heaving. The IRC R403.1.4.1 base frost-depth rule is 36 inches nationally, but Chicago-area jurisdictions almost universally adopt 42 or 48 inches to match observed ground-freeze cycles. This is non-negotiable for footing inspections. If your contractor quotes you deck footings at 36 inches, they're not local-code-aware — push back. Similarly, fence-post holes for vinyl or wood fences in Des Plaines should be 42+ inches deep in frost-bearing soil, with concrete set below frost depth. Shallow footings fail spectacularly in March when the ground heaves.

Electrical and plumbing subpermits are separate line items in Des Plaines. If you're doing a kitchen remodel, you file the building permit for the work scope, then the electrician files an electrical subpermit, and the plumber files a plumbing subpermit. You can coordinate all three at the Building Department counter. Licensed electricians and plumbers must hold valid Illinois licenses and pull their own subpermits — the city will not accept an electrical permit pulled by a homeowner, even in owner-builder cases. This is stricter than some Illinois jurisdictions and reflects Cook County's enforcement culture.

Des Plaines requires a site plan or lot survey for most exterior work — decks, additions, garages, fences. The site plan must show property lines, lot dimensions, setbacks, and where the proposed work sits relative to the property line and easements. The #1 reason fence and deck permits get delayed or rejected is a missing or incorrect site plan. You don't need a formal surveyor's drawing; a sketch with measurements from a property deed or a metes-and-bounds description works. But it has to be accurate. If you're unsure about your exact property line or setbacks, spend $200–400 on a property-line survey before you file — it eliminates rejection risk.

The city's online permit portal tracks status, allows document uploads, and shows inspection schedules. As of 2024, the portal is functional for most permit types, but some older projects or special cases may require in-person visits. Check the city's website for the current portal URL and login guidance. For complex projects, many applicants still file in person at the Building Department office to get real-time feedback on completeness — this is a smart move if you're uncertain about documentation.

Most common Des Plaines permit projects

These are the projects that bring homeowners to the Building Department most often. Each has specific thresholds, costs, and timelines in Des Plaines.

Decks

Any attached deck, elevated patio, or freestanding deck structure 30 inches or higher requires a permit. Frost-depth footings (42 inches in Des Plaines) are non-negotiable. Ground-level patios without a ledger board are typically exempt.

Fences

Fences over 6 feet tall, all masonry walls over 4 feet, and any fence within a corner-lot sight triangle require permits. Pool barriers always require permits. Most residential wood and chain-link fences under 6 feet in rear yards are exempt — but verify if your lot is a corner lot.

Do I need a building permit
in Des Plaines, IL?

Do I need a permit in Des Plaines, IL?

What's specific to Des Plaines permits

Most common Des Plaines permit projects

Decks

Fences

Roof replacement

Electrical work

Room additions

Do I need a building permit in Des Plaines, IL?

Do I need a permit in Des Plaines, IL?

What's specific to Des Plaines permits

Most common Des Plaines permit projects

Decks

Fences

Roof replacement

Electrical work

Room additions

Do I need a building permit
in Des Plaines, IL?