Permitting Process
Permitting is the part of a solar project that intimidates most DIYers — and it’s the part that’s actually less difficult than it looks. A building permit is simply your local government’s way of verifying that your installation meets code before you build it and after it’s complete. The process is bureaucratic, not technical. If you have a well-prepared application with a complete plan set, it’s largely a matter of submitting paperwork and waiting.
This chapter walks you through what permits you’ll need, what goes into the application package, what reviewers are looking for, and how to avoid the common mistakes that cause delays or rejections.
What permits you’ll need
Almost every jurisdiction in the United States requires a building permit for a residential solar installation. The specific permits and the department that issues them vary by location, but here’s what’s typical:
Electrical Permit
Required in nearly all jurisdictions. Covers the electrical work: wiring, inverter installation, panel interconnection, grounding, and disconnects. This is the primary permit for a solar installation. Some jurisdictions require this to be pulled by a licensed electrician.
Building / Structural Permit
Often combined with the electrical permit into a single “solar permit.” Covers the structural attachment of racking to your roof or the ground-mount foundation. Some jurisdictions require a separate structural review, especially for older homes or heavy snow-load zones.
HOA Approval
Not a government permit, but if you live in an HOA community, you may need architectural review board approval. Many states have solar access laws that limit an HOA’s ability to restrict solar installations, but you should still submit for approval and understand your state’s protections.
Zoning / Land Use
Rarely an issue for roof-mount systems, but ground-mount installations may require a zoning review or variance depending on setback requirements, height restrictions, and lot coverage limits in your municipality.
Can homeowners pull their own permit?
In most states, homeowners can pull permits for work on their own primary residence. However, some jurisdictions require that the electrical permit be pulled by a licensed electrical contractor. A few require a licensed solar contractor specifically. Check with your local building department before assuming you can self-permit — this is one of the first things to verify. If a licensed contractor is required to pull the permit, that doesn’t mean they have to do all the work; it means they take responsibility for the permitted scope.
What goes into a permit application
A complete solar permit application typically includes a plan set and supporting documentation. The exact requirements vary by AHJ, but the following components are standard across most jurisdictions:
| Document | Purpose | Notes |
|---|---|---|
| Site plan / roof plan | Shows panel layout, setbacks, fire access pathways, and equipment locations on the property | Drawn to scale with dimensions. Must show property boundaries, building footprint, and north arrow. |
| Single-line diagram | Electrical schematic of the entire system from panels to point of interconnection | Includes all wire sizes, conduit sizes, OCPD ratings, disconnect locations, and grounding details. |
| Equipment spec sheets | Manufacturer datasheets for panels, inverter, racking, rapid shutdown devices, and batteries (if applicable) | Reviewers verify equipment listings (UL certifications), ratings, and compatibility with the design. |
| Structural details | Racking attachment method, load calculations, and engineering letters from the racking manufacturer | Most racking companies provide stamped engineering letters for their systems. Some AHJs require a site-specific structural analysis. |
| String sizing calculations | Temperature-corrected voltage calculations proving strings stay within inverter limits | Not required by all AHJs, but many request them. We include them as standard practice. |
| Permit application form | The jurisdiction’s own form with project details, contractor info, and property information | Available from your building department, usually downloadable from their website. Some jurisdictions use online portals exclusively. |
Some jurisdictions have adopted streamlined or “fast-track” solar permitting processes, especially for straightforward roof-mount systems under a certain size. These simplified processes may require less documentation — sometimes just a standard one- or two-page solar permit form plus spec sheets. Check your local building department’s website to see if a streamlined process is available.
What plan reviewers are looking for
Understanding the reviewer’s perspective helps you submit an application that gets approved on the first pass. Plan reviewers are checking your submission against the building code, electrical code (NEC), and fire code. They’re not designing your system — they’re verifying that your design meets code.
Here are the key areas they focus on:
- Fire code compliance. Are setbacks, access pathways, and ridge clearances shown correctly on the roof plan? Do they meet the locally adopted fire code edition?
- Electrical code compliance. Does the single-line diagram show correct wire sizes, OCPD ratings, and disconnect locations? Is the interconnection method compliant with NEC 705? Is rapid shutdown addressed?
- Equipment listings. Are all components (panels, inverter, racking, rapid shutdown devices) listed and certified by a recognized testing laboratory (UL, CSA, TUV)? Unlisted equipment will be rejected.
- Structural adequacy. Does the racking system have engineering documentation for the wind and snow loads at your site? Is the attachment method appropriate for your roof type?
- Completeness. Are all required documents included? Is the information consistent across documents (the panel count on the roof plan matches the single-line diagram, the inverter model on the SLD matches the spec sheet, etc.)?
The most common reason for permit rejection isn’t a fundamental design flaw — it’s missing information. An incomplete application gets sent back for corrections, which adds weeks to your timeline. Submitting a thorough, professional-quality plan set on the first attempt is the single best thing you can do to keep your project on schedule.
The submission and review process
The process varies by jurisdiction, but the general flow is the same everywhere:
1. Submit Application
Day 1
Submit the completed application form, plan set, spec sheets, and any required fees. Many jurisdictions now accept online submissions through a permitting portal. Others require paper copies — sometimes multiple sets.
2. Plan Review
1–4 weeks typical
A plan reviewer examines your submission for code compliance. Review times vary enormously — from same-day in jurisdictions with streamlined solar processes to 4+ weeks in busy urban departments. You can often check status online.
3. Corrections (if needed)
Adds 1–3 weeks
If the reviewer finds issues, you’ll receive a correction notice listing what needs to be fixed or clarified. Address each item, resubmit, and the application goes back into the review queue. This is where incomplete applications cost you time.
4. Permit Issued
Ready to build
Once approved, you receive the building permit. Post it visibly at the job site during construction (usually required). You can now begin installation. The permit typically has an expiration date — usually 6–12 months to complete the work.
After installation, you’ll schedule an inspection with the building department. The inspector verifies the installation matches the approved plans. We cover inspection preparation in detail in Chapter 14.
Common permitting mistakes and how to avoid them
After helping homeowners through hundreds of permit applications, these are the mistakes we see most often:
- Submitting incomplete applications. Missing spec sheets, no structural details, or a single-line diagram that’s missing wire sizes and OCPD ratings. Every missing item is a correction round, and every correction round adds weeks.
- Inconsistencies between documents. The roof plan shows 20 panels, but the single-line diagram shows 18. The inverter on the SLD doesn’t match the spec sheet. The wire size on the diagram doesn’t match the calculation. Reviewers catch these and will flag them.
- Not checking which NEC edition is adopted locally. Your AHJ might be on NEC 2017 while the plan set was designed to NEC 2023 requirements, or vice versa. The differences matter — especially for rapid shutdown, conductor sizing, and interconnection rules.
- Ignoring fire code setbacks. Drawing panels right up to the roof edge or over the ridge line. Reviewers check setbacks and pathway requirements against the locally adopted fire code. This is an immediate rejection.
- Not accounting for the 120% busbar rule. Proposing a solar breaker that violates NEC 705.12 without showing an alternative interconnection method. The reviewer will catch this and require a compliant solution.
- Starting installation before the permit is issued. This should go without saying, but never begin work before you have the approved permit in hand. Unpermitted work can result in fines, required removal, and problems with your utility interconnection and home insurance.
Permit fees and timeline expectations
Permit fees for residential solar vary widely by jurisdiction. Some charge a flat fee for solar permits (often $100–$500), others charge based on system size or project valuation, and a few charge nothing at all. Call your local building department or check their website for the current fee schedule.
Timeline expectations:
| Jurisdiction Type | Typical Review Time | Notes |
|---|---|---|
| Streamlined / fast-track | Same day – 1 week | Available in many solar-friendly cities and counties. Often uses a simplified checklist for standard residential systems. |
| Standard review | 1–3 weeks | Most suburban and mid-size jurisdictions. Full plan review by electrical and building inspectors. |
| Busy / backlogged | 3–6+ weeks | Large urban departments with high permit volume. Some offer expedited review for an additional fee. |
Add correction rounds if your application isn’t approved on the first review — each round typically adds 1–3 weeks. This is the strongest argument for submitting a complete, professional-quality application the first time.
How we help with permitting
Permitting assistance is one of our core services. Here’s what we do:
- Research your AHJ’s requirements. We find out what your specific building department requires in a solar permit application, which NEC edition they enforce, and whether a streamlined process is available.
- Prepare the complete plan set. Roof plan, single-line diagram, string sizing calculations, wire and conduit schedules, structural details, and labeling schedule — all formatted to meet your AHJ’s expectations.
- Compile spec sheets and supporting documents. We gather all the required equipment datasheets, engineering letters, and certifications so you don’t have to track down each one individually.
- Handle corrections. If the reviewer sends back comments or requests changes, we address each correction and prepare the resubmission. Most corrections are minor clarifications or additional documentation — not fundamental redesigns.
You handle the actual submission (since you’re the property owner and permit applicant) and pay the permit fees directly. We do the engineering and documentation work that makes the application approvable.
Don’t let the paperwork slow you down.
We prepare permit-ready plan sets designed to get approved on the first submission. You submit the application; we handle the engineering and documentation that makes it approvable.
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