As solar installations become more common across residential and commercial properties, understanding the engineering requirements is key to a successful project. One of the most common questions solar professionals and homeowners face is: Do I need PE stamping, SE stamping, or both?

If you're unsure, this guide will help clarify the difference and when each is needed.

What is PE Stamping?

PE stands for Professional Engineer. A PE stamp certifies that a licensed engineer has reviewed the electrical design of your solar project and verified that it meets safety codes and engineering standards.

When Do You Need PE Stamping?

• Your project includes solar panel systems, battery storage, or EV chargers.
• The local building department or utility provider requires an engineer's approval.
• You’re working with complex or large-scale systems, especially in commercial or industrial settings.

A PE will confirm that the electrical design:

• Meets National Electrical Code (NEC) standards.
• It is safe to install and operate.
• Aligns with utility interconnection requirements.

What is SE Stamping?

SE stands for Structural Engineer. An SE stamp indicates that a licensed engineer has evaluated whether the structure supporting your solar system, like a roof or ground mount, can handle the load and stress of the installation.

When Do You Need SE Stamping?

• Installing panels on residential or commercial rooftops.
• Using ballasted systems that rely on weight instead of roof penetrations.
• Designing solar carports, canopies, or ground-mounted systems.
• Jurisdictions require documentation proving structural safety and load calculations.

The SE ensures that:

• The system can withstand wind loads, snow loads, and seismic activity.
• The structure can safely support the added weight of solar equipment.
• All design elements follow relevant building codes (like ASCE 7 or local ordinances).

PE Stamping vs SE Stamping: Which One Applies to Your Project?

Important: Local regulations can vary by city, county, or state. Always confirm specific requirements with your Authority Having Jurisdiction (AHJ) or permitting office.

Why Getting the Right Stamps Matters.

Neglecting to get proper PE or SE stamps can result in:

• Permit rejections or delays
• Non-compliance with local codes
• Project redesigns or added costs
• Safety risks and liability issues

On the other hand, having stamped plans from licensed engineers:

• Accelerates the permitting process
• Ensures structural and electrical safety
• Builds confidence with inspectors and utility companies

Understanding when you need PE or SE stamping is crucial for a smooth and compliant solar installation. Both play vital roles in ensuring your project meets code, performs safely, and stands the test of time.

If you're not sure which stamp is required or you're looking for fast, accurate engineering services, our team is here to help. We provide PE and SE stamping services for residential and commercial solar projects nationwide, ensuring you stay on schedule and in compliance.