Choosing a contractor for your commercial solar project is one of the most consequential decisions you will make in the entire process. The contractor you hire will design your system, procure the equipment, manage the installation, and in many cases handle permitting, utility interconnection, and long-term maintenance. Get it right and you have a system that performs reliably for 25 years or more. Get it wrong and you may be dealing with delays, underperformance, or worse, a contractor who is not around to stand behind their work.
The problem is that the commercial solar market includes a wide range of contractors, from experienced, vertically integrated firms with deep construction backgrounds to newer entrants with limited track records. On paper, many proposals look similar. In practice, the differences can be significant.
Here are the questions every building owner should ask before signing a contract.
1. How Do You Manage Quality and Accountability on Your Projects?
Many commercial solar projects involve multiple parties, from installers to electricians to specialty contractors. What matters is not just who is involved, but how the work is coordinated and who is ultimately accountable for the outcome.
Ask how quality control is handled on site, how issues are addressed when they arise, and who is responsible for ensuring the project meets both design and construction standards from start to finish.
2. What Is Your Background in Commercial Construction?
Ask: “How long have you been in commercial construction?”
Solar installation is fundamentally a construction project. It involves structural assessment, electrical engineering, roofing integration, permitting, and coordination with utilities. All of these require real construction expertise, not just solar knowledge.
Contractors who come from construction trades such as roofing, electrical, or general contracting bring practical experience that pure solar companies may not have. They understand how buildings are built, what can go wrong during installation, and how to protect the structure while adding solar infrastructure.
Ask specifically about roofing experience. For rooftop solar installations, the contractor’s understanding of membrane systems, drainage, load capacity, and long-term maintenance is just as important as solar expertise. A solar installation done without proper roofing knowledge can create leaks, void warranties, or lead to structural issues that do not show up until years later.
Gordian’s perspective: Gordian Energy Systems is built from the same ownership as Cole Roofing, a fourth-generation Maryland roofing company with more than 100 years of commercial construction history. That background is foundational to how rooftop projects are approached.
3. Can You Show Me Completed Projects Similar to Mine?
Ask: “Can you provide references and case studies from commercial projects similar to mine in size, building type, and application?”
Any contractor can describe projects they have completed. What you want is specific, verifiable proof that they have done work that resembles yours. A 500 kW ground-mounted system is very different from a 200 kW rooftop installation on an occupied warehouse. A community solar project is different from a behind-the-meter system for a healthcare facility.
Ask for references you can contact directly. Speak with building owners or facility managers about their experience, how the system has performed, and how the contractor handled challenges after installation. A contractor who hesitates to provide references may be worth evaluating more carefully.
Also ask about regional experience. A contractor who regularly works in your area is more likely to have relationships with local utilities and permitting authorities, which can help move your project forward more efficiently.
4. How Do You Handle Permitting and Utility Interconnection?
Ask: “Who manages permitting and utility interconnection, and what is your track record for timeline accuracy?”
Permitting and interconnection are common sources of delay in commercial solar projects. Navigating local authorities and utility requirements requires experience, coordination, and the ability to anticipate challenges.
Find out whether the contractor manages this process internally or uses third parties. Ask how updates are communicated if delays occur, and what protections exist in your contract if the timeline shifts.
Experienced EPC contractors provide realistic timelines that account for interconnection wait times. Be cautious of timelines that seem overly optimistic.
5. What Happens After the System Is Installed?
Ask: “Do you offer operations and maintenance services, and what does your long-term service agreement look like?”
A commercial solar system is a long-term asset. The contractor who installs it should be someone you can rely on over its lifetime, not just during construction.
Ask whether they provide ongoing services such as monitoring, preventive maintenance, inverter replacement, and system inspections. Understand their response time for service issues and whether they have a dedicated service team.
Contractors who offer in-house operations and maintenance have a direct interest in ensuring the system is installed correctly from the start. That alignment is important.
6. What Are Your Licensing, Insurance, and Safety Certifications?
Ask: “What licenses do you hold in this state, and can you provide your insurance certificates and safety record?”
Commercial solar construction requires proper licensing and insurance coverage. Confirm the contractor is licensed to operate in your state.
Request proof of general liability and workers’ compensation insurance, and verify that coverage limits match the size of your project. Ask about their safety record, including their EMR, which reflects their safety performance relative to the industry.
A strong safety record is an important indicator of how a contractor manages risk on job sites.
The Right Contractor Makes All the Difference
Commercial solar is a long-term capital investment. The contractor you select has a direct impact on how the system performs, how smoothly the project runs, and whether you have a reliable partner years down the line.
These questions are not meant to create friction. They are meant to help you have informed and productive conversations. A contractor who answers clearly and openly is more likely to be a strong partner.
Gordian Energy Systems is a full-service commercial solar EPC contractor rooted in the construction legacy of Cole Roofing. With more than 150 MW of operating solar assets across rooftop, canopy, and ground-mounted systems, we bring the experience and long-term accountability that complex projects require.
If you are evaluating contractors for your next solar project, we would love to chay:
gordianenergysystems.com/contact-us or