Before an electrical sub mobilizes on a commercial job, the general contractor’s subcontract dictates the insurance it has to carry — and demands proof of it. For an electrical business bidding work under general contractors, understanding that package is the difference between starting on schedule and getting held at certificate time. This post walks what a GC typically requires from an electrical sub and how to read it against your own policy.
The short version: a GC almost always requires general liability at the limit the contract sets, additional-insured status on that general liability, a certificate of insurance evidencing it, workers compensation, and commercial auto — with an umbrella added on larger jobs. The additional-insured guide owns the endorsement mechanics; this post is the owner’s-eye view of the whole requirement and how to satisfy it.
Where the requirements live: the insurance exhibit
The insurance a general contractor wants is not a conversation — it is a written exhibit attached to the subcontract, the master services agreement, or the purchase order, paired with a demand for a certificate of insurance covering every item on it. The thing an electrical contractor has to internalize is that this exhibit is a checklist the GC will actually verify: its compliance team, or a third-party portal on larger contractors, reads the certificate and the endorsement forms against the exhibit line by line, and any mismatch stops the file. Reading the exhibit early — before signing, not when the certificate request lands the week of mobilization — is the single most useful habit for a sub that works under general contractors. It turns a job-stopping gap into something you handle on your own timeline. Treat the insurance exhibit the way you treat a set of plans: a document to read and build to before the work starts, not a formality to sign past.
On the larger general contractors the review is not even a person you can call and reason with — it runs through a third-party compliance portal that checks the certificate and the endorsement forms against the exhibit automatically and flags anything that does not match. That makes the exhibit less a negotiation than a specification: the coverage either matches what is written or the file does not clear, and no amount of explaining after the fact moves it. The electrical contractors who move fastest read the exhibit against their policy at bid time, so that by the day a certificate is requested there is nothing left to fix.
General liability and the additional-insured demand
At the center of nearly every exhibit sits general liability at the limit the contract sets, paired with a requirement that the general contractor be named an additional insured on it. Additional-insured status extends part of your general liability to the GC for liability connected to your electrical work, and a careful contract asks for it on both your ongoing operations while the crew is on the job and your completed operations after the power is on and the work is signed off — in ISO’s system, usually the CG 20 10 and CG 20 37 endorsements, though editions vary by carrier. The mechanics of those two endorsements — why an electrical sub needs both, and why the completed-operations one is the piece that gets missed — are exactly what the additional-insured guide walks in full, so read it there rather than here. The owner’s takeaway for this post is narrower: the status is granted by the endorsement on your policy, not by the certificate that references it, and the completed-operations piece matters because electrical work carries a long tail — a connection you leave behind that overheats months later. Confirm both are actually attached rather than assume the pair is there.
The certificate is the evidence, not the coverage
The most expensive misunderstanding in the whole exchange is treating the certificate of insurance as the coverage. It is not. A certificate is a snapshot that evidences coverage was represented on a given day; the coverage itself lives in the policy and the endorsements attached to it. A general contractor that collects a certificate and files it has proof coverage was represented — not the additional-insured status, and not the limits the exhibit demanded. For an electrical contractor, the practical consequence is that a clean-looking certificate does not mean the underlying endorsements are on the policy. The honest move is to confirm the endorsements exist and reach the operations the contract requires, then let the certificate evidence what is genuinely there.
There is a second wrinkle worth knowing, because it cuts both ways. A certificate can be issued showing coverage that a later policy change quietly removed, and it can name limits or additional-insured status the underlying policy does not actually grant the general contractor. Neither the electrical sub nor the GC is well served by a certificate that overstates the program, because the gap only surfaces when a claim tests it — which is the worst possible moment to learn the wording was never attached. The discipline that protects both sides is the same one: the endorsements and limits are confirmed on the policy first, and the certificate is issued to reflect what is genuinely there, not what the contract wished for. For an electrical contractor whose worst exposure is a fire that shows up long after the job is done, that discipline is not paperwork — it is the difference between a claim that is covered and one that is argued.
Workers comp, commercial auto, and the umbrella on larger jobs
Beyond general liability, the exhibit reaches the rest of your program. Workers compensation is nearly universal, because the general contractor does not want your injured crew members — an electrocution, an arc-flash burn, a fall — reaching back to it, and many project owners require comp regardless of a state’s own rules. Commercial auto covers the trucks and vans your crews drive to and around the site, and the exhibit usually sets a limit for it. On larger jobs the requirements climb: an umbrella or excess policy to reach a higher total limit than the primary policies carry, often paired with a waiver of subrogation and primary-and-noncontributory wording that push the weight of a covered claim onto your program rather than the GC’s. Each of these is granted by policy terms or an endorsement — not by the certificate — so each is another line to confirm against your actual program rather than assume. The bigger the job, and the more of it is commercial and industrial work under a general contractor, the longer and stricter the exhibit tends to run.
Read the exhibit against your policy before you sign
The pattern that separates the subs who mobilize on time from the ones who sit is simple: the first group reads the insurance exhibit against its own policy before signing, and the second reads it when the certificate request arrives. Everything the GC demands — the general-liability limit, the additional-insured endorsements for both operation windows, the workers-comp and auto requirements, the umbrella and the waiver terms on larger jobs — is something you can check against what your policy actually carries, in advance, on your own schedule. Do it early and any gap becomes a task; do it late and the same gap becomes a stalled crew.
Real-World Scenario: An electrical contractor wins a commercial build-out under a general contractor and signs the subcontract without reading the insurance exhibit closely. On mobilization day the GC’s compliance team rejects the certificate: the general-liability limit is fine, but there is no completed-operations additional-insured endorsement and the umbrella falls short of the required limit. The crew waits while the contractor scrambles to have the endorsement added and the limit raised mid-job — slower and costlier than it would have been up front. A second electrical sub on the same project read its exhibit before signing, arranged the endorsement and the umbrella in advance, and mobilized on schedule. Same requirements; the one who read them early started on time.
Where the requirements meet your coverage
A general contractor’s insurance requirements are a checklist it will verify, the coverage that satisfies them lives in your policy and its endorsements rather than the certificate, and the completed-operations additional-insured piece and the higher-limit terms are the ones most often missed. Read the insurance exhibit against your own program before you sign, confirm the endorsements are attached and the limits are met, and handle any gap on your timeline instead of the project’s. The additional-insured guide walks the endorsement mechanics in detail, the general liability, workers compensation, commercial auto, and umbrella pages show how each line the exhibit asks for is built, and the commercial and industrial electrical work where these demands concentrate is exactly where an early read pays off. When you are ready, start a quote and send us the contracts you are bidding. The habit costs a few minutes at bid time and saves a stalled crew at mobilization.