Key takeaways
- The solar permitting process runs in eight stages, from site data capture to utility permission to operate.
- Your drafting window is fixed and knowable. AHJ plan check is not: review time swings with jurisdiction, routing and queue depth.
- Plan set assembly carries the most leverage: everything a plan checker can correct is decided before you hit submit.
- A resubmittal usually re-enters the queue rather than resuming, so first-round completeness beats speed everywhere else.
- Permit issuance is not the finish line. Inspection and interconnection are separate approvals with separate owners.
The solar permitting process runs in eight stages: capture site data, design the system, assemble and stamp the plan set, submit to the AHJ, wait out plan check, clear corrections, take permit issuance, then pass inspection and utility interconnection. An installer controls the first three stages and the corrections turnaround. The AHJ and the utility control the rest. Most schedule slippage traces back to an incomplete first submittal.
What follows is that sequence stage by stage: what happens, who does the work, how long it takes and what stalls it. It is written for installers running crews against a permit calendar. Avila Solar Drafting drafts solar plan sets as an outsourced service.
What are the stages of the solar permitting process?
Every jurisdiction dresses this up differently, but the sequence does not change. Durations for AHJ and utility stages are directional only, because those clocks are not yours to set.
| Stage | Who owns it | Typical duration | What stalls it |
|---|---|---|---|
| 1. Site data capture | Installer or surveyor | One visit; scheduling drives it | No panel photo, no rafter size or spacing, no meter number |
| 2. System design | Installer or design partner | Inside the plan set window when outsourced | Equipment swapped mid-design; inverter unconfirmed |
| 3. Plan set assembly and stamping | Drafting team; PE where required | 2-3 business days standard, 1-2 Fast Roof | Incomplete intake, missing spec sheets |
| 4. Submittal | Installer or coordinator | Same day once complete | Wrong portal, expired registration, unpaid fee |
| 5. Plan check | AHJ plan examiner | Varies widely; NREL tracks medians | Queue depth, routing across departments |
| 6. Corrections and resubmittal | Installer and drafting team | Quick to revise; re-review restarts the clock | Vague comments, second-round surprises |
| 7. Permit issuance | AHJ | Same day to several days after review | Unpaid fees, missing signatures, stale application |
| 8. Installation and inspection | Installer; AHJ inspector | Set by inspector availability | As-built deviations, labels on an unadopted cycle |
| 9. Interconnection and PTO | Utility | Set by utility tariff and queue | Incomplete application, no meter, no final inspection |
How does site data capture start the permitting process?
Nothing downstream is better than the site data feeding it. The survey is where the permit is quietly won or lost, because every dimension, rating and photo captured here becomes a line a plan checker can question later.
The minimum useful capture is a full electrical picture and a full structural picture. Electrical means the main service panel: busbar rating, main breaker rating, available spaces, feed direction, a legible photo of the panel schedule and deadfront label, the utility meter number and the service entrance configuration. Structural means rafter or truss size, spacing, span and direction, sheathing, roof covering, pitch, and a measured layout with obstructions marked.
What installers skip is the boring stuff: a clear shot inside the panel, the address as the county records it rather than as the customer says it, and exact module and inverter model numbers rather than a family name. Each omission becomes an intake question, and an intake question becomes a day.
Our site survey checklist covers what to photograph and measure in the order a surveyor walks a site. This stage is entirely yours, with no AHJ queue and no AHJ opinion, which makes it the cheapest place in the process to buy schedule back.
What happens during the design stage?
Design converts site data into a system that holds up under review. It is engineering, not layout: array geometry is visible, but the calculations behind it are what the plan examiner reads.
Electrically, that means string sizing against module temperature coefficients and the inverter MPPT window, conductor ampacity with the right correction factors, overcurrent protection, voltage drop, and the interconnection method at the point of connection. Supply-side versus load-side matters here, and load-side taps must satisfy the busbar rules in the adopted cycle. Structurally, it means array weight over attachment points, attachment spacing, and wind and snow loads for the actual site rather than a regional default.
Storage reshapes this stage. Batteries pull in the siting, clearance and listing requirements of NEC 2023 Article 706 that a straight PV job never touches, and they change the rapid shutdown and disconnect picture. Our explainer on solar and storage code covers which articles apply and where they collide.
The practical risk is churn. Substitute a module after design starts, or change the inverter count because the customer resized, and the calculations move with it. Lock equipment before design, not after. When design is outsourced, this stage runs inside the drafting window rather than adding to it.
How is the permit-ready plan set assembled and stamped?
Assembly turns the design into a submittable document set. It is the highest-leverage stage: after it you are no longer adding quality, only defending it.
The package speaks to three readers: the plan examiner checking code, the inspector who will stand on the roof with it, and the utility reviewing interconnection. We have a separate breakdown of what a plan set contains, so skip the sheet list. What matters is internal consistency: equipment on the site plan matches the single-line diagram, the spec sheets and the label schedule.
Stamping belongs at the end of assembly, not as an errand afterwards. Some jurisdictions require a wet or digital PE stamp on structural sheets for every rooftop array; others only above a load threshold or on ground mounts. Check when a PE stamp applies before you assume; Avila provides engineering stamps where required.
When assembly is outsourced, the handoff has a fixed shape. You open a free account on the ordering portal, then submit the project: address and jurisdiction, the survey package with roof framing and service panel details, module, inverter and racking model numbers with their spec sheets, and the site photos. Flag the exceptions at intake rather than mid-draft: a supply-side connection, a battery, a ground mount, a jurisdiction that wants a stamp. Each one changes who touches the file.
What comes back is one submittal package rather than loose drawings: sheets, calculations, spec sheets and label schedule, stamped where that jurisdiction requires it, as a downloadable PDF in the same account. The stage table above gives the window, and it starts when the intake is complete, not when you open the order. Revisions run back through the same project, so send a correction letter with the sheet numbers it applies to rather than as a fresh request.
Avila’s standard drafting turnaround is 2-3 business days from a complete intake, and 1-2 business days on Fast Roof. That window is a commitment about the document: complete, code-compliant against your AHJ’s adopted cycle, and designed to pass first-time review. It says nothing about AHJ review time, which is not ours to promise. Our guide to plan set quality applies the criteria a plan examiner uses.
What does the submittal stage actually involve?
Submittal is administrative, and it fails for administrative reasons. The drawings are usually fine; the application wrapped around them gets kicked back.
Before uploading, run a completeness pass: contractor license current in that jurisdiction, correct applicant of record, parcel and address matching county records, fees understood, and the file format and sheet size the portal expects. Our checklist on whether a design is ready to submit exists for this gate, and it is faster to run than to skip.
Jurisdictions differ more than installers expect. The City of Portland publishes its solar permit requirements with an eight-step path, a split between prescriptive and engineered pathways, and a document list covering structural design criteria, a site plan showing fire access pathways, roof framing plan and cross-section, racking attachment details and engineering calculations, and warns that the engineered pathway carries a longer review. That is one city; yours will differ.
Many jurisdictions have moved residential work onto automated review. The Department of Energy describes SolarAPP+ as running automated code compliance checks so eligible permits are approved without a human in the loop, while complex systems route back to manual review. Where it runs, submittal compresses hard, but eligibility rules are strict and anything outside them lands in the regular queue.
How long does plan check take, and what happens during it?
Plan check is the stage installers ask about most and control least. Your set enters a queue, gets assigned to an examiner, and is read against the codes that jurisdiction has adopted plus local amendments.
Routing makes duration unpredictable. One solar permit can need sign-off from building, electrical and fire, sometimes planning or zoning, and those reviews may run in sequence rather than parallel. One slow desk sets the pace for all of them, and a holiday week or post-incentive rush lengthens the queue further.
There is real data on this. NREL’s permitting and interconnection timeline research, the program behind SolarTRACE, reports median cycle times from more than 1,500 jurisdictions across 140 utilities and 26 states. The variation is too wide to summarize with one number, so treat any vendor quoting a single figure for AHJ review as guessing.
Adopted code cycle is the variable people underestimate. NFPA publishes the National Electrical Code as NFPA 70, and NEC 2017, 2020, 2023 and the published 2026 edition are all enforced somewhere in the US right now – with a handful of jurisdictions further back still, including Washington, DC on the 2014 NEC. A set drawn to NEC 2023 690.12 rapid shutdown language can draw a correction in a jurisdiction still on the 2017 cycle. We cover more of that in a separate post on AHJ quirks.
How does the corrections cycle work?
If the examiner finds something, you get a correction letter: a numbered list of comments, sometimes with code citations, often without. This stage decides whether the project lands on schedule.
The cost of a correction is rarely the fix. Revising a sheet is quick; the cost is re-entering the queue, because most jurisdictions treat a resubmittal as a new review event rather than resuming where the first stopped. A two-line correction can cost as much calendar time as the original submission, and two rounds of it reschedule the crew twice.
Handle a correction letter as one batch. Address every comment, including the ones you think are wrong, and attach a response narrative mapping each comment to the sheet and revision cloud where it was answered. Examiners with a clear response letter spend less time hunting, and hunting produces second-round comments on sheets nobody touched.
Push back only with a citation. If a comment misreads the code or applies a cycle the jurisdiction has not adopted, say so and cite the article and edition. Arguing without a citation reads as non-compliance and invites a re-read of the whole set. The causes are consistent everywhere and almost all preventable at assembly; our breakdown of why permits get rejected covers the categories that recur most.
What happens between permit issuance and inspection?
Once review clears, the AHJ issues the permit. Fees come due, the permit card is generated, and the approved set becomes the controlling document for construction. Build to it: the inspector compares the roof to those sheets, not your latest internal revision.
Installation is your stage again, but it carries permit risk. Any field change is a deviation: a different attachment pattern because the rafters were not where the survey said, a relocated inverter, a substituted conductor, an added combiner. Small deviations get corrected at inspection; large ones need a permit revision, which sends those sheets back through review.
Inspection is the AHJ verifying that what was approved is what was built. Expect attention on attachment and flashing, conductor routing and support, grounding and bonding, overcurrent protection, working clearances, disconnect accessibility, and labeling. Labels fail more inspections than anything else on that list, because placard text and placement are both cycle-specific and jurisdiction-specific.
Scheduling is the other constraint. Inspector availability is a real queue in busy jurisdictions, and a failed inspection means a re-inspection slot rather than a same-day fix. Book as early as the AHJ allows, and have the approved set, permit card and equipment listings on site when the inspector arrives.
How does interconnection sign-off close the process?
The building permit and the interconnection agreement are two approvals from two bodies on two clocks. The permit does not get you permission to operate. The utility has its own application, technical requirements and queue.
File the interconnection application early, alongside or just after permit submittal, because utility review often outruns plan check. Portland General Electric’s interconnection requirements for installers show the shape of it: UL 1741-compliant inverters, effective grounding, a lockable AC disconnect within ten feet of the meter, utility-owned revenue-grade metering, and compliance with the Oregon Administrative Rules for the program. Every utility publishes an equivalent, and the details differ.
The last gate is permission to operate. The utility wants the signed-off final inspection, the executed agreement and, in many territories, a meter exchange before the system may energize. Systems sit dark waiting on PTO more often than installers plan for, and that wait sits entirely outside your control.
Two things smooth this stage. Production modeling matching the as-built system keeps the application consistent with what was installed, and Avila produces production reports in Aurora, Helioscope and PVsyst. On larger and commercial systems, documented startup testing gives the utility and the customer a clean handoff, which is where commissioning support comes in.
FAQ
How long does the solar permitting process take from start to finish?
There is no single national number, which is why NREL built a data set covering more than 1,500 jurisdictions rather than an average. What you can pin down is your own portion: site data capture is one visit, plan set drafting with Avila is 2-3 business days standard or 1-2 business days on Fast Roof from a complete intake, and submittal is same-day. Plan check, inspection and interconnection are set by other people.
What is the difference between plan check and inspection?
Plan check is a document review before construction. An AHJ examiner reads your plan set against the adopted code cycle and local amendments, then approves it or issues corrections. Inspection happens after construction and verifies that the installed system matches the approved documents. They are separate approvals handled by different people.
Do I need a PE stamp on my solar plan set?
It depends on the jurisdiction and the project. Some AHJs require a professional engineer stamp on structural sheets for every rooftop array; others only above a defined load or outside a prescriptive attachment pathway. Ground mounts trigger it far more often than rooftops. Confirm before assembly, not after a correction letter, because adding a stamp late means re-issuing sheets.
What causes the most correction cycles in solar plan check?
Internal inconsistency and missing documents, far more than genuine design errors. Equipment on the site plan that contradicts the single-line diagram, spec sheets absent for a listed component, structural calculations that ignore the actual rafter size, and labels drawn to a code cycle the jurisdiction has not adopted. Nearly all of it is preventable at assembly.
Does Avila Solar submit the permit application for me?
No. We draft the plan set; you hold the license and the portal account, so submittal stays with you. We work with installers and EPCs, not homeowners, and any homeowner-direct request carries a development fee that every business — installers, EPC firms, engineering firms, architects, developers and general contractors — is exempt from. Pricing depends on scope and complexity — current figures are on the solar plan sets page. Avila Solar Drafting does not accept projects in APS or SRP territory in Arizona, the cities of Peoria and Phoenix, or Los Angeles County (LABD) in California.
Put the stages you control on a fixed clock
You cannot shorten an AHJ queue or hurry a utility. What you can do is make sure the package entering that queue gives the examiner nothing to send back, and that the stage before submittal takes a known number of days rather than whatever your project manager fits in around installs.
That is the whole of what we do: outsourced plan sets for installers, drafted against the code cycle your jurisdiction has adopted, delivered in 2-3 business days standard or 1-2 business days on Fast Roof.
Or talk it through first: 971-410-0655
