For solar installers and EPCs doing business in multiple states, permitting is no surprise. For solar installers and EPCs doing business across multiple states in the U.S., permitting is a well-known cul-de-sac. There are more differences in permitting between residential and commercial than in the size of the paperwork. They impact your timeline, your documentation stack, your engineering needs, and your cost per project. If you do not do it correctly, it will result in revision cycles, AHJ rejection, and delayed Permission to Operate (PTO).
PTOEdge partners with solar installers, EPCs, and developers in all 49+ states. Whether it’s a residential or commercial project, our team handles solar permitting, plan sets, PTO’s, and PE stamps every day. Knowing the difference between the two tracks can help your team get it right the first time and close projects more quickly.
Prior to discussing each difference, it’s important to acknowledge that PTOEdge’s permitting service applies to both types of projects. That’s what our plan does—it involves documentation, PE stamp review, and PTO coordination. Our project end-to-end approval process, from a 6KW home project to a 500KW commercial application.
What is Solar Permitting and why is it different?
Permitting is the process of obtaining local government approval for the installation of a solar system before installation. An Authority Having Jurisdiction (AHJ) will inspect your plan set, the structure, electrical plans, and compliance with code before giving you a building permit.
After all, the primary difference between permits for residential and commercial buildings is scope. A residential system is smaller, simpler, and provides for one family. A commercial system is for use in a business, school, warehouse, or industrial facility and typically has a more complicated electrical and structural design.
AHJ reviews permits for both types of projects. However, there is a big difference in depth, time, and documentation required.
Key Residential vs Commercial Permitting Differences
The following documents and plan sets are required for each project:
A Residential solar plan set normally comprises a site plan, roof plan, single-line diagram, and rapid shutdown compliance notes. Moreover, many AHJs throughout the states, including Florida, Texas, and Arizona, will take a standard residential plan set format.
On the other hand, however, commercial solar plan sets are much more detailed. Three-line diagrams replace single-line diagrams. Engineers require structural engineering calculations, load analysis reports, utility interconnection documentation, and detailed mounting system specs.
Additionally, commercial submittals in states such as California and New York can be 30 to 60 pages or more.
Finally, two formats are included in PTOEdge’s plan set. Each plan set is custom-made for the requirements of the AHJ and utilities in your project’s state — not a one-size-fits-all plan.
1. PE Stamp Requirements
In the U.S., many jurisdictions recognize the standard engineering assumptions for residential systems. A few AHJs in states such as Texas, Georgia, and Nevada don’t mandate a PE stamp for residential rooftop installs of a specific system size.
For commercial systems, the chances are virtually certain that a PE stamp will be required. In some states, such as California, Illinois, New York, and Massachusetts, this is a fixed requirement. The PE stamp gives the roof or ground mount structure the assurance that the structure is structurally sound, the electrical design is correct, and the load calculations are accurate.
PTOEdge offers PE (Licensed Engineer Review) Stamps for both residential and commercial projects. All of our engineers are licensed in several states and know what each AHJ is looking for.
2. AHJ Review Timelines
Most U.S. jurisdictions have faster permitting for residential projects. For instance, California, Colorado, and New Jersey are among the states with SolarAPP+ that permit same-day approval of qualifying residential systems. Automated review of code compliance is instant, and approval is granted without manual AHJ review.
In nearly all jurisdictions, commercial permits are manually reviewed. Review periods are typically 2 weeks to a few months, depending on the size of the project, completeness of documents submitted, and the AHJ. Additionally, some states, such as New York and Massachusetts, have longer commercial review cycles because they interpret codes more strictly and have more documentation requirements.
PTOEdge monitors, reports, and reports on AHJ review cycles and correction trends for all active jurisdictions.
3. Utility Interconnection Complexity
Interconnection of residential facilities is simple. A net metering application, a single-line diagram, and a utility approval form are usually all that is required. States such as Florida, Texas, and Arizona have most utilities that process residential interconnection in a few weeks.
That’s a far cry from commercial interconnection. For larger systems, a formal Interconnection Study (and possibly a Feasibility Study, System Impact Study, or Facilities Study) may need to be completed prior to a utility’s approval of the connection. In other states such as California, New York, and Illinois, this can lengthen commercial projects by months.
Both types of projects are documented by PTOEdge. The team knows the needs of all 500+ utilities in the USA, and they are ready to submit offers to cut back and forth with the utility.
4. Process for the 5. Permission to Operate (PTO)
Different states across the U.S. apply residential and commercial permitting requirements in different ways. The utility issues Permission to Operate, typically within 1–2 weeks for residential systems in cooperative states.
Commercial PTO is more lengthy. For utilities, they may require additional documents such as a commissioning report, system test results, and sometimes a final engineering sign-off before issuing Permission to Operate. In states such as Illinois and New York, utilities typically grant commercial PTO within four to eight weeks after inspection.
PTOEdge’s PTO service covers the entire submission and follow-up process for residential and commercial projects. As a result, no details are lost, from scheduling the inspection to issuing the final PTO.
Below is a summary of how permitting is handled around the country.
State-by-State Permitting Landscape — Key Differences to Know
These residential vs commercial permitting disparities are used by different states in the U.S. in different ways.
State-by-State Solar Permitting Requirements in the USA
For example, California has adopted SolarAPP+ for residential fast-track permits. Commercial projects go through the local building department with strict Title 24 energy compliance requirements. In addition, for utilities, larger systems are under the jurisdiction of the CPUC as the regulator of utility interconnection.
Meanwhile, in Texas, there is no statewide standard for reporting residential permits, which are reported at the county/city level. In urban areas such as Houston and Dallas, commercial projects involve complex utility coordination and structural engineering requirements, which have to be addressed by ERCOT-connected utilities.
Solar Permits in Florida are governed by the Florida Building Code, which is applicable to both residential and commercial situations. Additional documentation and calculations for wind uplift for commercial systems in hurricane zones.
The requirements are different in NYC and upstate.NYC commercial projects must be licensed by the Department of Buildings and must be stamped by NYC licensed PEs. The documentation requirements for residential projects outside NYC are more onerous than national averages, but projects take less time to complete.
Arizona is one of the quickest states to permit residential solar installations thanks to streamlined AHJ processes. There are many different commercial projects for each county and project size.
New Jersey has made SolarAPP+ available for home fast-track applications.
Residential vs Commercial Solar Permit Processes Across States
In most service areas, utilities must conduct utility interconnection studies for solar projects over 10kW before connecting them to the utility grid, and they typically perform these studies for commercial projects. The PTOEdge platform streamlines the process of both permitting tracks.
How PTOEdge Simplifies Solar Permitting, PE Stamps & PTO Coordination
Residential Solar installers who work with businesses also require a partner who is familiar with both sectors, as well.PTOEdge designed the permitting service specifically for this process.
We prepare plans for solar permits and follow up until AHJ approval. Our PE stamp service includes the review of structures and electrical work and is available in several different states. In addition, your final submission to the utility includes everything your PTO needs to make sure that it gets there the first time, with our PTO coordination.
Managing Multi-State Solar Projects with Real-Time Permit Tracking
Furthermore, your team has real-time visibility of all your projects with our platform. You can view the status of each permit, the corrections required, and the expected approval date — for residential and commercial projects, all on the same dashboard.
Faqs
Q1. PE stamp required for solar commercial projects?
Yes, in most U.S. states. The AHJ will not issue a permit unless the solar system is accompanied by a structural drawing and an electrical drawing signed by a licensed Professional Engineer. Others, such as California, New York, Illinois, and Massachusetts, have this requirement more rigorously.
SolarAPP+ States may issue residential permits on the same day. U.S. authorities issue residential project permits within 1–3 weeks. The processing time for commercial permits is typically four to twelve weeks, depending on the size of the project, the complexity of the utility interconnection process, and the AHJ. The most frequent cause for delay in commercial permits is incomplete documentation, which is why it is imperative to have plan sets ready for the permit.
No. Each plan set will be unique for each project address, roof layout, panel placement, and utility service territory. AHJs review project-specific documentation, NOT generic designs. PTOEdge, however, has a much streamlined production process, keeping us able to provide EPCs and installers with high project numbers with accurate, site-specific residential plan sets within a few days — that’s why they work with us