Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
All grid-tied solar systems in Clayton require both a building permit (for roof mounting) and an electrical permit (for the inverter and wiring), plus a utility interconnection agreement with Duke Energy. Off-grid systems under 10 kW may be exempt if they truly serve only that property and have no battery storage.
Clayton follows North Carolina's statewide solar adoption of NEC Article 690 and IBC Chapter 15 (solar) — but what sets Clayton apart is its dual-permit enforcement and strict Duke Energy pre-approval sequencing. Unlike some nearby towns that issue building and electrical permits in parallel, Clayton's Building Department will often hold the electrical permit review until you provide proof that Duke Energy has accepted your interconnection application (not full approval, but acceptance of your engineering specs). This creates a critical sequencing issue: the utility needs your one-line diagram and rapid-shutdown design before the AHJ will sign off on electrical. Additionally, Clayton sits at the boundary between climate zones 3A and 4A, which affects roof snow-load calculations on the mounting hardware — the city's permit application now explicitly requires a structural evaluation if your system weighs over 4 lbs/sq ft (most modern thin-film and microinverter setups are under 3.5, but traditional glass-and-frame monocrystal arrays hit 4+ easily). Battery storage of any size triggers a separate fire-marshal review, and systems over 20 kWh require seismic anchoring documentation even though Clayton is low-seismic. The city's online permit portal (managed through the Johnston County system) does not yet support solar pre-submission, so you must file in person or by mail with wet signatures — no digital workflow yet, which adds 5-7 days versus nearby Raleigh or Durham.

What happens if you skip the permit (and you needed one)

Clayton solar permits — the key details

North Carolina General Statute 62-155.1 requires all grid-connected solar systems to obtain an electrical permit and an interconnection agreement with the local utility authority — for Clayton, that's Duke Energy Carolinas (DEC). The National Electrical Code Article 690 (Photovoltaic Systems) is the governing standard, and Clayton adopted the 2020 NEC via the 2021 North Carolina Building Code. The city's Building Department explicitly requires that you submit a one-line diagram showing the DC string configuration, inverter model number, rapid-shutdown compliance method (NEC 690.12 requires a listed shut-off device that de-energizes the array within 10 seconds), and the AC interconnection point to the main panel. If your system is roof-mounted on a structure built before 2000, the city requires a signed structural evaluation from a PE or architect confirming the roof can handle the dead load (snow) and live loads (wind, 90 mph per ASCE 7) — this is where most DIY-designed systems fail permit review. The 2021 NEC tightened rapid-shutdown language compared to the 2017 code: you cannot simply rely on the utility shutoff; you must have an accessible switch or wireless device on the inverter that cuts DC within 10 seconds. Clayton's electrical inspector will physically test this at final inspection, and if it doesn't work, you fail and must re-pull the permit ($150 recheck fee).

Clayton's building permit for solar mounting falls under IBC Chapter 15 (Solar Energy Systems) and IRC R907 (Solar Thermal Systems), though photovoltaic is technically covered under R324. The city requires that roof-mounted arrays have a minimum 24-inch clearance from ridge lines and roof edges (to allow emergency egress and prevent wind uplift failure) — this is stricter than the default 18-inch NEC allowance and is specific to Clayton's adoption of the 2021 Code with local amendments. Ground-mounted systems in Clayton must be set back at least 5 feet from property lines and cannot exceed 15 feet in height without a variance (zoning height limits). If your home is in a historic district overlay zone — Clayton has one covering the downtown grid — the Planning Department may require solar panels to be rear-facing only or require a historic-preservation review, which adds 2-3 weeks and $300–$500 in review fees. The city also requires conduit fill calculations on the electrical plans: NEC 300.17 limits conduit fill to 40% for more than two conductors, and Clayton's inspector checks this meticulously because undersized conduit causes heating and inverter shutdowns that then generate complaint calls. Roof penetrations must use flashing rated for the roof material and slope angle — Clayton specifies EPDM or metal flashing bonded to the roof substrate, and the building inspector will probe the flashing at final to confirm no water intrusion risk.

Utility interconnection with Duke Energy is a separate approval path from the city permit. You must submit a DEC Interconnection Application (Form DG-1 for systems under 10 kW, or DG-2 for 10-25 kW) and an engineering one-line diagram at least 15 days before the city issues the electrical permit. Duke Energy's Carolinas division reviews these in 20-30 days typically, and they will approve, approve-with-conditions (usually requiring a utility-grade meter and CT bypass), or deny. Clayton's Building Department now cross-checks the utility's acceptance letter before signing off on electrical — this is a procedural change from 2022 onward. If Duke Energy requires a new meter or CT installation (common in Clayton because the city's distribution system is heavily loaded in summer), that adds $500–$1,200 and 3-4 weeks, and you must hire a DEC-approved electrician to coordinate the meter changeout. Battery storage systems (even small 5 kWh Tesla Powerwalls or LG Chem units) add a third approval layer: the fire marshal must review the battery enclosure design, state-of-charge management, thermal runaway protection, and emergency ventilation. Batteries over 20 kWh-equivalent (two Powerwalls or one commercial unit) require seismic anchorage design and a licensed battery installer — Clayton's fire marshal enforces this strictly because North Carolina has had two battery-system fire incidents in residential settings in the past decade. The permit fee for a 5-10 kW system is typically $300–$500 for the building permit and $200–$350 for the electrical permit, calculated as 1.5-2% of the installed cost (assumed $3.50/watt, so a 7 kW system = $24,500 value = ~$350–$500 in fees). If you add battery storage, add another $150–$250 in review fees for the fire-marshal sign-off.

Clayton's Building Department operates Monday-Friday, 8 AM-5 PM, and requires in-person or mailed applications — no online portal for solar yet. The typical timeline is 3-4 weeks from submission to permit issuance, assuming your structural and electrical plans are complete and Duke Energy has already accepted your interconnection app (not approved, but formally received). If plans are incomplete, the city issues a Request for Information (RFI), and you have 10 days to resubmit — every resubmission adds another week to the clock. Once you have the building and electrical permits, you schedule the mounting inspection (typically same day or next day), then the electrical rough inspection (DC and AC wiring), and finally the final electrical inspection after the system is energized. Duke Energy must witness the final interconnection, which requires scheduling the utility technician 5-7 days in advance. The entire process from signed contract to net-metering-ready can take 8-12 weeks if Duke Energy approval is smooth, or 14-16 weeks if meter upgrade or CT bypass is needed. Owner-builders in Clayton are allowed to pull building and electrical permits for their own owner-occupied homes, but they must sign a form confirming they meet the 'use and occupancy' definition — you cannot be a licensed contractor or do this as a side business. If you hire a licensed solar contractor (which most homeowners do), they typically handle all permitting and Duke Energy coordination, rolling the $500–$1,000 permit and review fees into the contract price.

One final local detail: Clayton's building code now requires a 'Solar Ready' label on the main electrical panel (as of 2022, per a minor local amendment) indicating the solar circuit location and disconnect switch location — this is sometimes forgotten by installers and causes a final-inspection failure. The city also strictly enforces the 'rapid-shutdown' testing at final, meaning the inspector will ask you to activate the shutdown device and measure voltage drop with a meter to confirm it drops below 80V DC within 3 seconds (NEC 690.12(B) now requires this, tightened from the old 10-second rule). If your inverter doesn't have a compatible rapid-shutdown device built-in, you must add an external relay or microinverter-based string combiner (like Enphase IQ series or SolarEdge modules with power optimizers), which costs an extra $1,500–$3,000 but is now non-negotiable in Clayton's permit process. Finally, if your property is in a flood zone (FEMA Zone A or AE near the Neuse River, which some Clayton properties are), the city requires flood-resilient mounting — either elevated racks at or above the base flood elevation, or pole-mounted systems above the 100-year flood line, adding another $2,000–$5,000 in structural work and a floodplain-development permit ($150–$300 fee).

Three Clayton solar panel system scenarios

Scenario A
5 kW roof-mounted grid-tied system, 20 solar panels, on a 1970s ranch home in suburban Clayton, no battery storage, pre-existing electrical panel in good condition
This is the most common residential solar setup in Clayton, and it requires both building and electrical permits. Your 5 kW system (20 x 250W monocrystalline panels) has a total weight of roughly 3.2 lbs/sq ft when mounted on rails, so it's just under the 4 lbs/sq ft threshold that requires a structural PE evaluation — but the city's inspector may still ask for confirmation via the roofer's signed estimate or a simple letter from the installer. The panels will be mounted east-west on a south-facing ranch roof with 30-degree pitch; you'll need to submit dimensioned roof drawings showing the 24-inch setback from the ridge and 18-inch clearance from roof edges (Clayton requires 24 inches). A single SMA or Fronius string inverter (6-8 kW-rated) will be mounted inside the home in the garage or laundry room, with a 100 mA rapid-shutdown device (ATS or similar) between the array and the inverter — this rapid-shutdown relay costs $800–$1,200 and is mandatory in Clayton. Conduit run from the roof array to the interior will be 1-inch EMT (electrical metallic tubing), and the city will verify fill calculations before issuing the electrical permit. Duke Energy's DG-1 form will specify net metering eligibility and a new digital meter (your existing mechanical meter will be replaced, no cost to you — Duke Energy covers this). Building permit fee: $350. Electrical permit fee: $250. Duke Energy interconnection processing fee: $0 (included in their net-metering agreement). Timeline: 3-4 weeks from complete application to permit issuance, assuming Duke Energy accepts your interconnection app within the first week (most accept within 3-5 days). Mounting inspection passes same day. Electrical rough inspection after conduit and wiring are complete (typically 1-2 weeks after permit issuance). Final inspection after system is energized and rapid-shutdown is tested — Duke Energy technician present to witness net-metering activation. Total timeline: 8-10 weeks from signed contractor agreement to first bill credits.
Building permit $350 | Electrical permit $250 | Rapid-shutdown relay device $800–$1,200 | Rafter ties or roof clips (labor only, ~$400) | Duke Energy meter swap (free) | Total permit & inspection $600 | Total installed cost $17,000–$21,000 (before tax credits) | Net metering credit timeline: 30-45 days after final inspection
Scenario B
8 kW ground-mounted solar canopy with post foundations over driveway, Clayton historic district overlay zone, same home as Scenario A
Ground-mounted systems in Clayton trigger all the same electrical permits as roof-mounted, but add a building/zoning layer and a historic-district review if your property is in the downtown or nearby protected zone. An 8 kW canopy system (32 x 250W panels) covers roughly 600 sq ft and sits 10-12 feet tall on post-and-beam aluminum racks; you'll need soil boring data or a soils report if the posts are deeper than 18 inches (Clayton's frost depth is 12-18 inches, so you're right at the line — most installers go 24-30 inches deep to be safe, which triggers the report requirement and costs $400–$600). The canopy posts must be set back 5 feet from all property lines per Clayton zoning code, and the total height cannot exceed 15 feet without a variance — a 12-foot-tall canopy is fine. However, if your property is in the historic district (Clayton's overlay covers the central grid), the Planning Department will review the solar canopy for visual impact and may require it to be sited on the rear or side elevation only, or demand architectural compatibility review — this adds a Planning Board meeting (2-3 weeks) and a $300–$500 planning review fee. The city's building permit for the canopy foundation and electrical system is separate: building covers the structural posts and footings ($400–$500 permit), electrical covers the inverter, wiring, and rapid-shutdown ($250–$350 permit). Duke Energy's DG-2 form (for systems 10-25 kW) applies here if you ever plan to expand; for 8 kW, DG-1 applies. A ground-mounted system also allows for easier battery storage integration — a 10 kWh battery bank can be housed in a weatherproof enclosure adjacent to the canopy, and the fire marshal will review the battery placement and ventilation. If you include a battery, add $150–$250 in fire-marshal review fees and ensure the battery enclosure is at least 10 feet from the home and 5 feet from property lines. Timeline: 4-6 weeks if no historic district overlay (building + electrical permits + soil report + mounting inspection + final). Add 3-4 weeks if historic-district review is required. Total: 7-10 weeks to final inspection.
Building permit $400–$500 | Electrical permit $250–$350 | Soil boring/report $400–$600 | Historic-district planning review $300–$500 (if applicable) | Rapid-shutdown device $800–$1,200 | Fire-marshal battery review $150–$250 (if battery included) | Total permit fees $1,900–$3,400 | Total installed cost $26,000–$32,000 | Timeline: 7-10 weeks
Scenario C
12 kW roof-mounted system on flood-zone property (Zone AE, Neuse River floodplain), home built 2005, owner-builder permit pull
This scenario showcases Clayton's flood-zone complexity and the owner-builder path. A 12 kW system (48 x 250W panels) is a larger residential array, and if your home is in FEMA flood zone AE (base flood elevation shown on the Flood Insurance Study map), the city requires the solar mounting structure to be elevated at or above the base flood elevation or pole-mounted above the 100-year flood line — you cannot have a traditional roof-mount sitting at normal roof height if it would be submerged in a 100-year flood event. For a home in AE zone, base flood elevation might be +15 feet, and if your roof is only at +12 feet, you must use a pole-mount system or elevated platform risers (which are expensive and uncommon). Alternatively, if your roof sits above the flood line, the city may still require you to document that the mounting structure and all electrical components (inverter, disconnects, conduit) are flood-resilient — this typically means placing the inverter at least 1 foot above the base flood elevation, which often means mounting it on an interior wall at second-floor height or in a raised utility room. The 12 kW system also crosses into DG-2 territory with Duke Energy, which requires more detailed engineering (voltage drop calculations per NEC 705.7, arc-flash studies, and protection coordination). As an owner-builder pulling permits for your own owner-occupied home, you must sign the city's Owner-Builder Affidavit confirming you are not a licensed contractor and this is for your personal use only — the city will verify you own the property and have owner-builder history (or confirm first-time owner-builder status). Clayton allows owner-builders to pull building and electrical permits, but you must pass a quick 'responsible person' check (basic background, no past permit violations). You'll handle all the permitting yourself, which saves contractor markup on fees (~$500–$1,000) but requires you to coordinate Duke Energy, the flood-plain management office (separate from building, requires +$150–$250 floodplain-development permit), and possibly a structural engineer (flood-zone systems often need engineering because the mounting must resist buoyancy and hydrodynamic forces — this adds $1,200–$2,000 for a PE stamp). Building permit for flood-zone mounting: $500–$600. Electrical permit: $350–$400. Floodplain-development permit: $150–$250. Structural/flood engineering: $1,200–$2,000. Duke Energy DG-2 review may take 30-40 days due to the larger size and protection coordination requirements. Timeline: 5-7 weeks for permits alone, plus 30-40 days for Duke Energy review, so 10-14 weeks total from permit application to utility acceptance. You must schedule both the city inspector and the floodplain official for final inspection (they often coordinate on the same day). Owner-builder advantage: you save $800–$1,200 in contractor overhead, but you must manage multiple agencies and timelines yourself.
Owner-builder affidavit sign-up (free) | Building permit $500–$600 | Electrical permit $350–$400 | Floodplain-development permit $150–$250 | Structural/flood engineering $1,200–$2,000 | Rapid-shutdown device $900–$1,400 | Total permits & engineering $3,300–$4,850 | Total installed cost $38,000–$48,000 | Duke Energy DG-2 timeline: 30-40 days | Total project timeline: 10-14 weeks | Owner-builder savings: ~$1,000 in contractor permit coordination

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Clayton's dual-permit sequencing trap and how to avoid permit delays

Roof structural evaluation is the second major sticking point. The 2021 NEC and IBC require a structural evaluation if a solar system exceeds 4 lbs/sq ft on the roof. Most modern monocrystalline panels on rail-mount systems run 3.0-3.5 lbs/sq ft, so many residential systems slip under the threshold. However, if you choose a heavier array (older glass-and-frame panels, multi-layer frames, or dense mounting hardware) or if your roof has existing defects, snow load, or previous damage, you will need a structural evaluation from a licensed PE or architect. Clayton's building inspector will visually assess this during plan review, and if there's any doubt — old roof, visible sagging, south-facing slope in a heavy-snow zone (which Clayton's Piedmont area experiences occasional 4-6 inch events in winter) — they will require a signed PE letter confirming the roof can handle the system. Hiring a PE for a structural evaluation costs $1,200–$2,000 and adds 1-2 weeks. If you try to skip it and fail plan review, you're forced to hire the PE anyway, losing the 1-2 weeks you saved and now being behind schedule. The safest approach: ask your solar installer to provide a roof load calculation sheet (most reputable installers have this template) showing your system's weight distribution, and include it with the application. If the inspector questions it, you have data. If the inspector explicitly requires a PE, you're already in dialogue and can hire one efficiently. One local note: Clayton's frost depth is 12-18 inches in most areas, but Piedmont clay soil can be unstable; post-mounted systems and ground-based canopies often need 24-30-inch footings, which requires a soils report if the frost line is deeper than expected. This is rare for roof systems but crucial for ground-mounts.

Duke Energy interconnection, net metering, and the meter swap timeline

Battery storage and fire-marshal review add complexity to Clayton permitting that many homeowners don't anticipate. If you include a battery system (Tesla Powerwall, LG Chem, Generac PWRcell, or any lithium-ion storage), the system must be reviewed by Clayton's Fire Marshal's office. Batteries under 5 kWh may get a simplified review; batteries 5-20 kWh require a full design review (thermal runaway protection, state-of-charge monitoring, ventilation, clearances from combustibles); batteries over 20 kWh require seismic design even though Clayton is low-seismic (this is a statewide NC rule). The Fire Marshal typically reviews the battery enclosure design, the inverter/charger specifications, and the emergency shutdown procedure — they'll ask for data sheets from the manufacturer proving the battery meets UL 3100 or equivalent. The battery enclosure must be installed at least 10 feet from the home (in case of thermal runaway, fire doesn't reach the house) and at least 5 feet from property lines and utilities. Processing time: Fire Marshal reviews take 1-2 weeks, and if they require changes (more ventilation, higher clearances), you add another 1-2 weeks. Cost impact: Fire-marshal review fee is $150–$250, and if they require a new enclosure design or relocation, that's $2,000–$5,000 in equipment and labor. Practical advice: if you're considering a battery system, hire your solar contractor or a battery installer to coordinate with the Fire Marshal's office during design phase (pre-permitting consultation) — most Clayton jurisdictions allow this and can give you guidance before you submit plans. This prevents plan-review denials and the cost of redesign.

City of Clayton Building Department
1 Town Hall Drive, Clayton, NC 27520
Phone: (919) 550-6500 | https://www.claytonncgov.com/ — check for online permit portal or call for current submission method
Monday-Friday, 8:00 AM - 5:00 PM (verify on city website; hours may shift seasonally)

Common questions

Can I install solar panels myself in Clayton without hiring a contractor?

Yes, as an owner-builder of your own owner-occupied home, Clayton allows you to pull both building and electrical permits yourself. You must sign the Owner-Builder Affidavit confirming you are not a licensed contractor. However, you cannot wire the array or inverter yourself if you are not a licensed electrician — electrical work must be done by a licensed NC electrician or the work will fail inspection. Roof mounting and structural work can be owner-performed if you are experienced, but if the system exceeds 4 lbs/sq ft or sits in a flood zone, you likely need a PE structural evaluation anyway. Most owner-builders hire a licensed electrician for the wiring and a contractor or roofer for the mounting, then pull permits themselves to save contractor markup. This saves $500–$1,000 in permit coordination fees but requires you to manage Duke Energy and the city's inspection timeline.

How long does Duke Energy take to approve my solar interconnection application?

Duke Energy Carolinas typically accepts (logs and confirms receipt of) a DG-1 form within 3-5 business days. However, acceptance is not the same as approval or permission-to-operate. Full engineering review and approval takes 15-30 days for straightforward systems. If DEC requires a new meter or CT bypass, add 2-4 weeks for equipment ordering and scheduling. Permission-to-operate (final approval after your city's final inspection) comes within 5-10 business days of the city's sign-off, and net metering credits appear 30-45 days later once billing is updated. Total timeline: 60-90 days from application to first net-metering credit is typical in Clayton.

Do I need a structural engineer's report for my roof-mounted solar system?

Only if your system exceeds 4 lbs/sq ft or if Clayton's building inspector has concerns about your roof's condition or age. Most modern monocrystalline panel systems on rail mounts run 3.0-3.5 lbs/sq ft and don't require engineering. However, if you have an old roof, visible damage, or a heavy array, the inspector will ask for a PE letter confirming the roof can handle snow and wind loads. If required, this costs $1,200–$2,000 and adds 1-2 weeks. To avoid this surprise, ask your installer for their roof load calculation sheet and submit it with your permit application — this often satisfies the inspector without requiring a formal PE evaluation.

What is rapid-shutdown and why does Clayton require it?

Rapid-shutdown is a safety device that cuts DC power from the solar array within 10 seconds if the system detects a fault or if a firefighter or utility worker activates an emergency shut-off. NEC Article 690.12 requires it, and Clayton strictly enforces it at final inspection. Most modern string inverters have rapid-shutdown built-in via a relay, but if your inverter doesn't, you must add an external rapid-shutdown device (costs $800–$1,200). The city inspector will test it with a meter at final — if it doesn't work, you fail and must re-pull the permit. Rapid-shutdown exists to protect firefighters from electrocution during emergency response, and Clayton takes this seriously.

Is my home in Clayton's historic district, and does that affect solar permitting?

Clayton's historic district overlay covers the central downtown grid and some surrounding blocks. If your property is in the overlay (check the city's zoning map or call the Planning Department), the city may require rooftop solar panels to be rear-facing only or may require a historic-preservation review before issuing the building permit. This adds a Planning Board review (2-3 weeks) and a $300–$500 fee. Ground-mounted systems in the historic district may be prohibited entirely or allowed only in rear yards. Call Clayton Planning at (919) 550-6500 to confirm your property's overlay status before designing your system.

What happens if my home is in a FEMA flood zone?

If your property is in Zone AE or another flood zone per the FEMA Flood Insurance Study, Clayton requires solar mounting structures to be elevated at or above the base flood elevation or pole-mounted above the 100-year flood line. This means roof-mounted systems may not be eligible unless your roof naturally sits above the flood line. You must obtain a floodplain-development permit (separate from building, $150–$250 fee) and may need a structural engineer to design flood-resilient mounting (adds $1,200–$2,000). Contact Clayton's Building Department or Floodplain Administrator to confirm your base flood elevation and what mounting options are allowed.

How much does a solar permit cost in Clayton?

A typical residential solar permit in Clayton costs $300–$500 for building and $200–$350 for electrical, totaling $500–$850. Fees are calculated as approximately 1.5-2% of the system's installed valuation (estimated at $3.50/watt, so a 5 kW system = $17,500 = $350–$500 in fees). If your system requires a structural evaluation (costs $1,200–$2,000), floodplain-development permit ($150–$250), fire-marshal battery review ($150–$250), or planning-district overlay review ($300–$500), total permit costs can reach $1,500–$3,500. Duke Energy's DG-1 application has no fee, but meter swap and CT installation labor may run $300–$600.

What is a rapid-shutdown relay and how much does it cost?

A rapid-shutdown relay (also called an external rapid-shutdown module or ATS) is a device that sits between the solar array and inverter and immediately cuts DC power if a fault is detected or an emergency shut-off is activated (per NEC 690.12). If your inverter has built-in rapid-shutdown (most modern string inverters do), you don't need a separate relay — but Clayton's inspector will verify it's listed and functional. If your inverter lacks rapid-shutdown, you must add a device like a SolarEdge SafeDC rapid-shutdown relay or similar, which costs $800–$1,200 in equipment and labor to install and integrate into the conduit run. Modern microinverter systems (like Enphase) have rapid-shutdown built into each module, so they don't need an external device.

Can I start installing solar panels before I receive the building permit?

No. North Carolina state law and Clayton's local code prohibit any construction work — including mounting, wiring, or equipment installation — until the building permit is issued and posted on the property. Starting work before permit issuance can result in a stop-work order, fines of $200–$500 per day, mandatory system removal, and the requirement to re-pull permits. Additionally, Duke Energy will not activate net metering without proof that the city's final inspection was completed, so unpermitted work also prevents you from selling power back to the grid. Always wait for the permit in hand before breaking ground.

How do I know if I need a roof structural evaluation for my solar system?

Clayton requires a structural evaluation if the system weighs more than 4 lbs/sq ft. Most residential monocrystalline systems on rail mounts are 3.0-3.5 lbs/sq ft, so they don't trigger this. However, if you have older panels, dense mounting hardware, multiple layers, or previous roof damage, you'll need one. Ask your solar installer to provide their roof load calculation sheet (shows weight per square foot) and include it with the building permit application. If the city's inspector has concerns about your roof's age, condition, or the system's weight, they will explicitly require a PE evaluation in the RFI (Request for Information). Once required, you must hire a PE ($1,200–$2,000) and resubmit — adding 1-2 weeks.

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Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current solar panel system permit requirements with the City of Clayton Building Department before starting your project.

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