Here is the answer nobody wants: there is no such thing as a state solar permit. Not in any state. The permit that governs your array is issued by a city or county building department — an Authority Having Jurisdiction, or AHJ — and there are more than 18,000 of them in the United States, each with its own submittal requirements, fee schedule and interpretation of the electrical code.
So every article that offers you a fifty-row table headed “solar permit requirements by state” is either summarising something else and mislabelling it, or making it up.
What states do control is real, consequential and worth understanding — but it operates one level above the permit. Three state-level layers determine how painful your local permit will be:
- Which edition of the National Electrical Code the state has adopted, and with what amendments. This sets what your system must physically comply with.
- Whether the state has mandated streamlined or automated permitting, and whether that mandate covers your project type. It usually doesn’t, if you’re off-grid.
- Whether the state offers a bypass when a local AHJ is obstructive — a few now do.
Below that, your county decides everything else. And before any of that, there is a threshold question that determines whether you are in the permit system at all.
The threshold question: is the structure a building?
This is the fork in the road, and almost all off-grid solar permitting outcomes are determined here rather than by anything about the panels.
If the solar is serving a habitable dwelling — a cabin someone sleeps in, a house, an ADU — you are in the full residential building code system. Building permit, electrical permit, inspections, and typically a requirement that the electrical work be performed or signed off by a licensed electrician regardless of who owns the property. The array is a component of a permitted structure and inherits that structure’s regulatory status.
If the solar is serving a genuinely non-habitable accessory structure — a well pump shed, a barn, a workshop, a gate opener, a livestock water pump — many jurisdictions have a size threshold below which the structure itself needs no building permit. Commonly 120 or 200 square feet, sometimes larger for agricultural buildings. If the structure is exempt from a building permit, a small ground-mount or shed-roof array serving it often falls outside plan review too.
If the system is not attached to a structure at all — a portable ground mount, a trailer-mounted array, a pole mount feeding a battery box — the analysis shifts to zoning rather than building code. Ground mounts are generally treated as accessory structures subject to setback requirements, height limits and lot coverage restrictions, and typically require a foundation or anchoring plan when they are permanent.
The trap: people assume “off-grid means no permit” because there’s no utility interconnection. Interconnection and permitting are separate processes. Being off-grid removes the utility’s Permission to Operate step and the interconnection application — often the longest single delay in a grid-tied project — but it removes nothing from the building department’s side. A 6 kW off-grid array on a cabin roof is a structural load, an electrical installation and a fire-service access question, and the AHJ cares about all three whether or not a meter is involved.
If you are still choosing land, this belongs in your due diligence rather than your build phase — zoning, utilities and land due diligence for off-grid building covers the sequence.
Layer 1: Code adoption — the thing that actually varies by state
States adopt building and electrical codes; localities enforce them. The National Electrical Code is republished every three years, and states adopt editions on wildly different schedules with wildly different amendments.
This matters more than it sounds. NEC editions have made substantive changes to PV requirements — rapid shutdown, arc-fault protection, disconnect labelling, conductor sizing, energy storage system separation. A plan set drawn to the 2023 NEC can be rejected in a jurisdiction still enforcing 2020 with state amendments, and vice versa.
The current picture is genuinely fragmented. North Carolina, for example, has most AHJs still referencing the 2020 NEC with state amendments, with 2023 adoption on indefinite delay. Do not assume that because a newer edition exists, it applies where you are building.
What to do about it: call the building department and ask one question — “which NEC edition and which state amendments are you enforcing today?” — before anyone draws a plan set. It is a thirty-second call that prevents a rejected submittal.
Layer 2: Streamlining mandates, and why they usually exclude you
Several states have legislated to force local jurisdictions to speed up residential solar permitting. This is real and it works — automated permitting platforms have been measured cutting approval timelines by roughly 14.5 business days on average.
The leading examples:
- California. AB 2188 amended the Solar Rights Act to require every city and county to adopt an expedited, streamlined permitting process for small residential rooftop systems. SB 379 went further, requiring most jurisdictions to implement an automated online permitting platform that verifies code compliance and issues permits in real time. Cities including Fresno, San Francisco and Stockton run SolarAPP+; Los Angeles, Oakland, Sacramento and San Jose offer same-day permitting.
- Maryland. Following the 2024 Brighter Tomorrow Act and the 2026 Utility RELIEF Act, statewide SolarAPP+ adoption is mandated and residential permitting fees are capped at $500.
- Texas. SB 1202 created a third-party permitting pathway, letting installers bypass an obstructive local AHJ.
Now the part that matters for readers of this article: SolarAPP+ does not handle off-grid projects. Its eligibility checklist is built around permitted, existing residential structures with grid-tied rooftop systems. Off-grid projects go through traditional permit review. So do most ground mounts, most new construction, most battery-heavy systems and anything on an unpermitted structure.
The streamlining revolution is genuinely transforming residential rooftop solar. If you are putting an array on an off-grid cabin, you are almost certainly not in it. Budget the traditional timeline — commonly one to four weeks for plan review in a functioning department, three to six weeks in a busy suburban county — and treat any faster outcome as a bonus.
Meanwhile, Florida has no SolarAPP+ adoption in any jurisdiction; manual submission is the statewide standard. If your mental model of solar permitting was formed in California, it will not transfer.
Layer 3: The 2026 economics have changed, and most advice hasn’t caught up
This is the single most consequential fact in off-grid solar right now, and a startling amount of currently-published guidance still gets it wrong.
The Section 25D Residential Clean Energy Credit — the 30% federal credit — is gone. The One Big Beautiful Bill Act, signed 4 July 2025, accelerated its termination. Under IRC Section 25D(e)(8)(A), an expenditure is treated as made when original installation is completed; the IRS confirmed in FAQ FS-2025-05 that installations completed after 31 December 2025 cannot claim the credit. There was no phase-down. Congressional Research Service analysis confirms the credit was repealed for expenditures made after calendar year 2025, while noting that carryforward rules for credits already earned are unaffected.
Section 25C, the Energy Efficient Home Improvement Credit, terminated on the same date.
Why this belongs in a permitting article: the 30% credit was frequently the deciding factor in whether an off-grid builder permitted the system at all. Claiming 25D required a documented, invoiced installation. That documentation trail nudged a lot of people toward doing things properly. With the credit gone, the financial incentive to permit has weakened at exactly the moment when the cost of not permitting has not changed at all.
Do not let that arithmetic tempt you. The consequences of an unpermitted array are unchanged and they are not tax consequences. They are: insurance claim denial after a fire, an unsellable property at closing, a red tag with an order to remove, and personal liability if the installation injures someone. More on how that flows through total ownership cost in the five-year cost analysis.
Some state and utility incentives survive independently of the federal credit, and the DSIRE database remains the place to check them. Verify that any programme you find is open to off-grid systems — a great many state programmes are written around grid-tied installations and net metering, and off-grid projects are ineligible by definition.
State comparison: what actually differs
This table compares the three things that genuinely vary at state level. It does not claim to tell you whether your specific project needs a permit — your AHJ decides that, and the answer is usually yes.
| State group | Streamlining status | Off-grid treatment | Practical permit friction |
|---|---|---|---|
| California | Mandated automated permitting (AB 2188, SB 379); widespread SolarAPP+ | Excluded from automated track; traditional review | Low for grid-tied rooftop, moderate for off-grid |
| Maryland | Statewide SolarAPP+ mandate; residential fees capped at $500 | Traditional review | Low–moderate |
| Texas | SB 1202 third-party permitting bypass available | Traditional review; bypass may apply | Moderate; strong recourse against obstructive AHJs |
| Arizona, Nevada, New Mexico, Colorado, Utah | Mixed local SolarAPP+ adoption | Traditional review; rural counties often light-touch | Low in rural counties, moderate in metro |
| Florida | No SolarAPP+ adoption statewide; manual submission | Traditional review | Moderate–high |
| North Carolina | Limited; 2020 NEC with state amendments still dominant | Traditional review | Moderate; confirm code edition first |
| Pacific Northwest (OR, WA, ID, MT) | Mixed; some metro adoption | Traditional review; rural counties variable | Low in rural, moderate in metro |
| Northeast (NY, NJ, MA, CT, VT, NH, ME) | Limited automation; dense local codes | Traditional review; historic districts add layers | High |
| Midwest (OH, IN, IL, MI, WI, MN, IA) | Limited automation | Traditional review; agricultural exemptions often useful | Moderate |
| South Central & Appalachian (KY, TN, WV, AR, MS, AL, OK) | Limited automation; several counties without building departments | Often outside any permit system for accessory structures | Low to very low in unincorporated areas |
The most useful cell in that table is the last row. A meaningful number of rural counties, particularly in the South Central states and parts of the Mountain West, have no building department and no adopted building code for unincorporated land. In those counties an off-grid cabin array may genuinely require no permit at all.
This is not a loophole to celebrate uncritically. Absence of a building department does not mean absence of consequence. Your insurer will still ask whether the electrical installation was performed to code, and a claim adjuster after a fire is a considerably less forgiving audience than a building inspector would have been. The NEC remains the standard of care whether or not anyone is checking.
What a permit submittal actually requires
For a residential or cabin off-grid system going through traditional review, expect to supply:
- A site plan showing the structure, array location, setbacks and property lines. Ground mounts need dimensioned setbacks and often a lot-coverage calculation.
- A structural assessment for roof mounts — rafter sizing, spacing, span, attachment method and the resulting dead and live loads. In snow or high-wind regions this frequently requires an engineer’s stamp.
- A single-line electrical diagram showing array, charge controller, battery bank, inverter, disconnects, overcurrent protection and grounding, drawn to the NEC edition your AHJ enforces.
- Equipment specification sheets for every listed component. Unlisted equipment is the most common single cause of rejection on off-grid submittals — imported inverters and charge controllers without UL listing will fail.
- A battery energy storage plan where applicable. This is now its own compliance area, covering chemistry, capacity, location, separation distances, ventilation and fire-service access. Lithium bank siting inside a habitable space is scrutinised far more heavily than it was five years ago.
Two of these determine most rejections. Get the listing documentation and the single-line diagram right and the rest is administrative.
Sizing the system correctly before you draw any of this saves an expensive redesign — array sizing and the panels-versus-batteries question works through the calculation, including why the shoulder-season case rather than the summer case should drive your array.
What permitting actually costs
Permit costs are quoted badly almost everywhere, because people quote the permit fee and stop. The fee is usually the smallest line.
The permit fee itself. Ranges from nothing in an unincorporated county with no building department, through a flat $150–$500 in most functioning jurisdictions, to valuation-based schedules in high-cost metros where a large system can attract four figures. Maryland’s recent legislation caps residential solar permitting fees at $500 — notable precisely because that cap was necessary.
The plan set. Off-grid systems do not get the templated treatment that grid-tied rooftop does, so a drawn, code-compliant submittal package typically runs a few hundred dollars from a permit design service. This is money well spent. A rejected submittal costs more in delay than the drawing cost.
The engineer’s stamp. Required for roof mounts in snow-load and high-wind regions, and for most permanent ground mounts. Add several hundred to low four figures depending on complexity. In seismic zones and coastal wind zones this is not negotiable and not worth arguing about.
The licensed electrician. Where the jurisdiction requires licensed connection work — which is most of them — this is a real labour line, not a formality, and it is priced by the day.
Retroactive permitting, if you skip all of the above and then need to sell. This is the expensive path, because inspection frequently requires opening up finished work: pulling conduit runs, exposing roof attachments, sometimes removing and reinstalling. Budget several multiples of what the up-front permit would have cost, plus the cost of a delayed closing.
The honest summary: on a modest off-grid cabin system, permitting compliance typically adds somewhere between a few hundred dollars and a few thousand, depending overwhelmingly on whether an engineer’s stamp and a licensed electrician are required. That is a real cost and it is worth planning for. It is not a reason to skip the process, and anyone telling you the numbers are so bad that going unpermitted is the rational choice is not accounting for the insurance and resale side of the ledger.
When the AHJ is the problem
Sometimes the obstruction is not the code. It is a specific building department that has never reviewed an off-grid system, does not have a category for it, and defaults to refusing what it does not recognise.
This is a genuine and underdiscussed failure mode in rural counties, and the standard advice — “just work with your AHJ” — is not always sufficient. Some things that actually help:
Submit against a recognised framework rather than asking for an exception. An off-grid PV and battery system is not a novel technology; it is a standard listed-equipment installation with no utility interconnection. Present it that way, with a conventional single-line diagram and listed components, and reviewers who are uncertain have something familiar to approve.
Ask which edition and which amendments, then draw to exactly that. Reviewers reject what they cannot match against their reference. Submitting a 2023 NEC plan set to a 2020 NEC jurisdiction invites a rejection that has nothing to do with the merits of your design.
Check whether your state provides a bypass. Texas’s SB 1202 exists precisely because obstructive local AHJs were a systemic problem, and it permits a third-party permitting pathway. Other states have narrower administrative appeal routes. This is worth knowing about before you need it.
Separate the structure from the array. If the building itself is unpermitted, the array cannot be permitted on it, and no amount of good documentation fixes that. Resolve the structure’s status first. Where the structure falls under an accessory-building exemption, say so explicitly in the application rather than leaving the reviewer to work it out.
Get the answer in writing. A verbal “you don’t need a permit for that” from a counter clerk is worth nothing at claim time or at closing. Ask for an email confirming that no permit is required for the described work, and keep it with the property file.
Frequently asked questions
Do I need a permit for off-grid solar? In most incorporated areas and most counties with a building department, yes — if the system serves a habitable structure or is a permanent installation. Being off-grid eliminates the utility interconnection process, not the building permit. Some rural unincorporated counties have no permit requirement for accessory structures; confirm with the county rather than assuming.
Does a small system fall below a threshold? Sometimes, but the threshold that matters is usually the structure’s exemption, not the array’s. Many jurisdictions exempt accessory structures under 120 or 200 square feet from building permits, which can carry a small array with them. Very few jurisdictions have a wattage-based PV exemption.
Can I do the electrical work myself? It varies, and the two questions are separate. Some jurisdictions allow homeowner electrical work on a primary residence; many require a licensed electrician for the connection regardless. Where automated permitting exists it often requires a licensed contractor and is unavailable for DIY projects — Montgomery County, Maryland is one documented example.
Is there still a 30% federal tax credit? No. Section 25D terminated for expenditures made after 31 December 2025 under the One Big Beautiful Bill Act. Installations completed on or before that date remain claimable, and unused credit already earned can still be carried forward. Nothing installed in 2026 qualifies under current law. State and utility incentives may still apply — check DSIRE, and verify off-grid eligibility.
Will an unpermitted array cause problems at sale? Routinely. Unpermitted electrical work is a standard title and inspection finding, and buyers’ lenders frequently require retroactive permitting or removal before closing. Retroactive permitting is materially more expensive than permitting up front, because inspection may require opening up completed work.
Do HOAs get a say? Less than they think. As of 2026, 44 states have solar access laws restricting an HOA’s ability to prohibit or substantially impair residential solar. But “cannot prohibit” is not “no restrictions” — many of those laws permit reasonable aesthetic conditions on panel colour, roof face and edge clearances, and challenging an unreasonable condition usually means an administrative or judicial process.
Verify before you build
This article is a planning reference, not legal or engineering advice, and permitting requirements change with each code cycle. Before committing to a design, confirm directly with:
- Your county or city building department — whether a permit is required, which NEC edition and state amendments are enforced, and what the submittal package must contain.
- Your county planning or zoning office — setbacks, height limits and lot coverage for ground mounts.
- Your insurer — whether an off-grid or self-installed system affects coverage, and what documentation they require. Ask this before installation, not after.
- DSIRE for current state and utility incentives, and confirm off-grid eligibility explicitly.
- A licensed electrician in your jurisdiction for anything touching the AC side, battery bank or main disconnect.