How solar panels permits work in Des Plaines
The permit itself is typically called the Residential Building Permit + Electrical Permit (Solar PV).
Most solar panels projects in Des Plaines pull multiple trade permits — typically building and electrical. Each is reviewed and inspected separately, which means more checkpoints, more fees, and more coordination between the trades on the job.
Why solar panels permits look the way they do in Des Plaines
O'Hare Airport adjacency triggers FAA Part 77 airspace obstruction review for any structure or crane exceeding roughly 35 ft in certain zones — contractors must file FAA Form 7460-1 before permit issuance for affected parcels. Des Plaines River 100-year floodplain covers significant residential areas requiring FEMA Elevation Certificates and finished-floor elevation compliance for new builds and substantial improvements. Cook County requires pre-demolition asbestos and lead surveys on pre-1978 structures per IDPH and IEPA rules before demo permits are finaled.
For solar panels work specifically, wind, snow, and seismic loads on the roof structure depend on local conditions: the city sits in IECC climate zone CZ5A, frost depth is 42 inches, design temperatures range from -4°F (heating) to 91°F (cooling).
Natural hazard overlays in this jurisdiction include FEMA flood zones, tornado, and expansive soil. If your address falls within any of these overlay zones, the solar panels permit application picks up an extra review step that can add days to the timeline and specific design requirements to the plans.
HOA prevalence in Des Plaines is medium. For solar panels projects this matters because HOA architectural review committee approval is a separate process from the city building permit, and the two have completely different rules. The HOA reviews materials, colors, and aesthetics; the city reviews structural, electrical, and code compliance. You generally need both, and the HOA approval typically takes 2-4 weeks regardless of how fast the city is.
What a solar panels permit costs in Des Plaines
Permit fees for solar panels work in Des Plaines typically run $150 to $600. Typically valuation-based at a percentage of project value; electrical permit is a separate flat or per-unit fee — confirm current schedule with Des Plaines Building Division at (847) 391-5380
Cook County and City of Des Plaines may each assess a technology/document surcharge; plan review fee is often billed separately from the building permit fee and is non-refundable.
The fee schedule isn't usually what makes solar panels permits expensive in Des Plaines. The real cost variables are situational. FAA Part 77 airspace filing and potential crane-height restrictions near O'Hare add consultant time and can require redesign of installation equipment staging. CZ5A ground snow load (~25 psf) and 42-inch frost depth require heavier racking and structural review of aging 1950s-70s rafter systems common in Des Plaines housing stock. 100A service panels — prevalent in mid-century homes — often require a full 200A service upgrade to meet ComEd interconnection requirements, a $2,500–$4,500 add-on. Module-level power electronics (MLPE, i.e., microinverters or DC optimizers) are effectively mandatory under 2020 NEC 690.12 rapid shutdown, adding $0.15–$0.30/W vs string-only systems.
How long solar panels permit review takes in Des Plaines
10-20 business days; no standard OTC/express path for solar in Des Plaines. There is no formal express path for solar panels projects in Des Plaines — every application gets full plan review.
The clock typically starts when the application is logged in as complete (not when it's submitted), so missing documents reset the timer. If your application gets bounced for corrections, you're generally back at the end of the queue rather than the front.
Documents you submit with the application
Des Plaines won't accept a solar panels permit application without the following documents. The package goes into a queue only after intake confirms it's complete, so any missing item costs you days, not minutes.
- Site plan showing roof layout, array footprint, setbacks from ridge and eaves (IFC 605.11 access pathways), and compass orientation
- Electrical single-line diagram stamped by licensed Illinois electrician showing inverter, rapid shutdown, AC/DC disconnect, and utility interconnection point
- Structural/load analysis (racking manufacturer letter or PE-stamped calc) verifying existing roof framing can carry added dead load — especially critical for 1950s-70s Des Plaines homes with aging rafter systems
- Manufacturer cut sheets for modules, inverter, and racking with UL listing numbers
- FAA Form 7460-1 determination letter or written AHJ confirmation that parcel is outside the critical obstruction zone (required for parcels near O'Hare)
Who is allowed to pull the permit
Homeowner on owner-occupied single-family residence may pull permits in Illinois; however, electrical work must still be inspected and is strongly recommended to use an IDFPR-licensed electrician. Most solar installers pull permits on behalf of the homeowner.
Illinois IDFPR Electrical Contractor license required for inverter/service tie-in work. Solar installers must also hold Des Plaines local business registration. Roofing-related penetration work requires IDFPR roofing contractor registration if roof membrane is disturbed.
What inspectors actually check on a solar panels job
A solar panels project in Des Plaines typically goes through 4 inspections. Each inspector has a specific checklist, and the difference between a same-day pass and a re-inspection (which costs typically $75–$250 in re-inspection fees plus another scheduling delay) usually comes down to one or two items on these lists.
| Inspection stage | What the inspector checks |
|---|---|
| Rough Electrical / Inverter Rough-In | Wiring methods, conduit fill, DC combiner/disconnect placement, rapid shutdown device installation per NEC 690.12, and grounding electrode connections |
| Structural / Racking | Lag bolt penetration depth into rafters, flashing and waterproofing at all roof penetrations, racking torque, and roof access pathway clearances per IFC 605.11 |
| Final Electrical | Completed single-line match to as-built, AC disconnect within sight of inverter, utility-side labeling, panel directory update, and ComEd interconnection approval on file |
| Final Building / Overall | System matches permitted drawings, all labels and placards in place (NEC 690.54/690.56), no egress or fire-access obstructions, and FAA determination letter in job file |
If an inspection fails, the inspector leaves a correction notice with the specific items to fix. You make the corrections, schedule a re-inspection, and the work cannot proceed past that stage until it passes. For solar panels jobs in particular, failing the rough-in inspection means tearing back open work that was just covered.
The most common reasons applications get rejected here
The Des Plaines permit office sees the same patterns over and over. These specific issues account for most first-pass rejections, and most of them are entirely preventable with a few minutes of double-checking before submission.
- Rapid shutdown non-compliance: module-level power electronics (MLPE) not installed or not listed per 2020 NEC 690.12 — the most common solar rejection in jurisdictions recently adopting 2020 NEC
- Roof access pathway violations: array layout does not preserve 3-ft ridge setback and perimeter walkway required by IFC 605.11 for fire department access
- Structural documentation missing or insufficient: no PE stamp or racking manufacturer letter confirming aging 1950s-70s rafter framing can carry panel dead load plus snow load (CZ5A ground snow ~25 psf)
- ComEd interconnection agreement not finalized prior to final inspection: Des Plaines inspectors require evidence of utility approval before issuing certificate of occupancy/final sign-off
- FAA Form 7460-1 not addressed: installers from outside the area frequently omit the O'Hare airspace review step, causing permit holds
Mistakes homeowners commonly make on solar panels permits in Des Plaines
Across hundreds of solar panels permits in Des Plaines, the same homeowner-driven mistakes show up repeatedly. The list below isn't exhaustive but covers the ones that cause the most rework, the most fees, and the most timeline pain.
- Signing a solar contract without verifying the installer is an Illinois Shines approved vendor — non-approved vendors cannot assign REC income to the homeowner, forfeiting thousands of dollars in incentives
- Assuming the permit is the last step before turn-on: ComEd interconnection approval is a separate process that must complete before the system can energize, and it runs on ComEd's timeline, not the city's
- Overlooking the FAA airspace question: homeowners near O'Hare assume it only affects large structures, but the Part 77 cone covers significant residential areas and the city will flag it during permit review
- Not confirming HOA solar rights under Illinois 765 ILCS 165 before signing — while the law protects solar access, HOAs can still impose reasonable aesthetic conditions that may require panel relocation and redesign
The specific codes that govern this work
If the inspector cites a code section, this is the list they'll most likely be referencing. These are the live code references that Des Plaines permits and inspections are evaluated against.
NEC 690 (PV systems — array wiring, grounding, labeling)NEC 705 (interconnected electric power production sources)NEC 690.12 (rapid shutdown — module-level power electronics required for roof-mounted systems under 2020 NEC)IFC 605.11 (rooftop access pathways: 3-ft setback from ridge and array perimeter for fire department access)IECC 2021 R406 (total energy compliance — solar-ready provisions may be relevant for new or substantially altered service)IRC R907 (re-roofing considerations if roof is replaced concurrent with solar install)
Des Plaines has not published widely-noted local amendments to the 2021 IRC/NEC for solar specifically; however, the FAA Part 77 airspace overlay for O'Hare creates a de facto pre-permit clearance step not found in base codes. Confirm current local amendments with the Building Division.
Three real solar panels scenarios in Des Plaines
What the rules look like in practice depends a lot on the specific situation. These three scenarios cover the common shapes of solar panels projects in Des Plaines and what the permit path looks like for each.
Utility coordination in Des Plaines
ComEd (1-800-334-7661 or comed.com) handles all grid interconnection; homeowners/contractors must submit a Distributed Generation Interconnection Application early — ComEd's review can take 4-10 weeks and the final permit inspection cannot close without ComEd's written approval. Illinois net metering credits exports at the full retail rate (not avoided cost), so no utility coordination barrier to ROI, but timeline is the key risk.
Rebates and incentives for solar panels work in Des Plaines
Some solar panels projects qualify for utility rebates, state energy program incentives, or federal tax credits. The most relevant programs in this jurisdiction are listed below — eligibility depends on equipment efficiency ratings, contractor certification, and post-installation documentation, so verify specifics before purchasing.
Illinois Shines Adjustable Block Program (REC incentive) — Variable — REC price set per block, roughly $50–$80/REC over 15 years; system size and block availability determine total. Grid-tied residential PV systems; installer must be an approved vendor; incentive is paid as REC purchase not an upfront rebate. illinoisshines.com
Federal Solar Investment Tax Credit (ITC) — 30% of total installed cost as federal tax credit. Applies to system cost including installation; claimed on federal return; no income cap for residential. irs.gov/credits-deductions
Illinois Solar for All (income-qualified) — Up to 100% of system cost offset for qualifying households. Income at or below 80% AMI; must use approved installer; limited enrollment windows. illinoissolarforall.com
The best time of year to file a solar panels permit in Des Plaines
CZ5A winters (design temp -4°F, frost 42 inches) make November through March the worst window for roof penetration work due to ice, frozen sheathing, and sealant temperature minimums; spring (April-May) and fall (September-October) are optimal for installation and also align with ComEd's faster interconnection queue before summer peak-demand season.
Common questions about solar panels permits in Des Plaines
Do I need a building permit for solar panels in Des Plaines?
Yes. Des Plaines requires a building permit for all rooftop solar PV installations regardless of system size. A separate electrical permit is also required because the inverter, service-entrance tie-in, and rapid-shutdown wiring constitute new electrical work under the adopted 2020 NEC.
How much does a solar panels permit cost in Des Plaines?
Permit fees in Des Plaines for solar panels work typically run $150 to $600. The exact fee depends on the project valuation and which trade subcodes apply. Plan review and re-inspection fees are sometimes assessed separately.
How long does Des Plaines take to review a solar panels permit?
10-20 business days; no standard OTC/express path for solar in Des Plaines.
Can a homeowner pull the permit themselves in Des Plaines?
Yes — homeowners can pull their own permits. Illinois owner-occupants may pull permits for work on their own single-family residence. Electrical and plumbing work on owner-occupied 1-2 family homes is generally permissible, though inspections are still required and licensed trades are strongly recommended for most systems work.
Des Plaines permit office
Des Plaines Community Development Department — Building Division
Phone: (847) 391-5380 · Online: https://desplaines.org
Related guides for Des Plaines and nearby
For more research on permits in this region, the following guides cover related projects in Des Plaines or the same project in other Illinois cities.