Put the question in any electricians' forum and it splits the room in a dozen replies. One camp installs whatever the customer hands over, because a slow Tuesday does not care where the fixture came from. The other camp refuses on principle, because they have eaten the callback on a bargain fan that wobbled itself loose in a month. Both camps are answering the wrong question. Whether to take the job is not a matter of pride or principle. It is three smaller questions with checkable answers: is the fixture listed, what does the hour cost when there is no parts margin under it, and where does your responsibility end when the hardware is somebody else's purchase.
This guide answers the three in order, then puts the result where it belongs, which is on the quote. The operators who lose money on customer-supplied work are rarely the ones who said yes. They are the ones who said yes and then priced and papered the job as if they had supplied the fixture themselves.
The short answer: listed fixture yes, unlisted fixture no
Install customer-supplied fixtures when the fixture carries the mark of a recognized testing laboratory, at a labor price built for these jobs, with the warranty boundary and the trip charge written on the quote. Refuse unlisted equipment outright, every time, no matter how good the week's calendar looks.
The refusal is not fussiness. Federal workplace rules put it plainly: listed or labeled equipment must be installed and used in accordance with any instructions included in the listing or labeling.1 The National Electrical Code carries the same requirement in Article 110, and it is the sentence your inspector reads first.2 An unlisted fixture has no listing to install to. There is no way to hang it in accordance with instructions that were never reviewed by a testing laboratory, which means the finished work can be flagged no matter how clean your splices are. The customer bought a fixture. You would be signing for it.
That asymmetry is the entire policy. When the fixture is listed, the job is a pricing exercise, and the rest of this guide handles it. When it is not, no price fixes it, and the only professional answer is the one that names the reason: the fixture has no listing, the code requires one, and you can supply an equivalent fixture that passes.
The listing label decides before you do
The check takes under a minute and belongs in the first conversation, before the truck rolls. Ask the customer to photograph the label on the fixture body or canopy and the instruction sheet in the carton. You are looking for the mark of a nationally recognized testing laboratory, a UL or ETL mark most often, or the mark of another lab the federal government recognizes for the purpose. A listed fixture arrives with installation instructions tied to that listing. Those instructions are what the code requires you to follow, and they are also your record that you followed them.
Marketplace fixtures are where the check earns its minute. The Electrical Safety Foundation International runs a standing campaign against counterfeit and unlisted electrical products because the fakes look legitimate on the outside while the materials and clearances inside were never tested, and they fail without warning.3 The tells repeat: no mark anywhere on the fixture, no instruction sheet in the carton, a manual that describes a different model, a seller listing that has vanished by the time you search for it. A counterfeit mark is worse than a missing one, and it is common enough that the label alone is not proof; a label with no matching model number and no paperwork behind it should read as unlisted.
Give the customer a way to say yes after you say no. The line that keeps the job is an offer, not a lecture: this fixture will not pass inspection, but I can supply a listed equivalent at a price on paper before I touch the ceiling. Some customers will return the marketplace fixture and take the offer. Some will not, and those are the jobs callbacks are made of.
Price the labor with no parts margin behind it
On a normal install, the fixture line quietly subsidizes the labor line. The markup on a supplied fixture absorbs the small overruns: the extra twenty minutes at the panel, the second trip to the truck, the mounting screw that strips. We covered how to set that margin in our guide to marking up materials. On a customer-supplied job that cushion is gone, so the labor price has to stand entirely on its own, and it should be higher than the labor portion of a comparable supplied install, not equal to it.
Anchor the arithmetic in what the hour costs. The Bureau of Labor Statistics puts the median electrician wage at $29.98 an hour, $62,350 a year, as of May 2024.4 A wage is not a billing rate. By the time the hour carries the truck, the insurance, the license, and the unpaid half of every working day, the billed hour runs a multiple of the median, which is exactly why giving away margin on somebody else's fixture is a quiet pay cut.
Two habits protect the rate. First, quote customer-supplied installs as their own flat line item, named as such, so the price never invites a comparison with a bundled install from last year. Second, bill the assembly. Marketplace fixtures arrive in more pieces than supply-house stock, with instruction sheets written for nobody. The forty minutes on the living room floor assembling a fan is work, and on a customer-supplied job there is no parts margin pretending to pay for it.
The box behind the fixture is your problem, and your line item
The customer bought the fixture. Nobody bought the box it hangs from, and the box is where customer-supplied jobs grow. The National Electrical Code requires a box used as the sole support of a ceiling fan to be listed and marked for fan support, with a 70 pound ceiling on what a marked box may carry, and heavy luminaires past the standard support limit need a box listed for the weight or support independent of the box.2 The fixture in the carton decides which rule you are under, and the customer who ordered a 30 pound fan to replace a flush-mount light has changed the job without knowing it.
So the quote carries a sentence the customer reads before you arrive: the price covers replacing a fixture on an existing, suitable box, and if the box is not rated for the new fixture, the box replacement is priced as its own line before the work continues. That is the discovered-condition rule we laid out for extra work that was not in the estimate, applied to the one discovery these jobs produce most. Price it at the ceiling, by name, before the old fixture comes down, and get the yes in writing.
What you may not do is absorb it. An unrated box behind a customer's new fan is not a courtesy fix. It is the difference between a fixture that stays on the ceiling and one that does not, and it is precisely the kind of condition the listing instructions and the inspector both care about.
Your warranty covers the splice, not the fixture
On a supplied job, the fixture's manufacturer warranty runs through you, and most shops fold the first callback into the price. On a customer-supplied job that arrangement must be severed in writing, because the failure odds are no longer yours to underwrite. You did not pick the fixture or the seller. So the quote says what is covered and what is not: workmanship is warranted, the splices you made and the mounting you set, for the term you stand behind. The fixture itself is warranted by its manufacturer, and a failure of the fixture is a warranty claim the customer makes with their receipt, not a free service call.
We made the case for how long the workmanship term should run in our guide to warrantying electrical work, and the argument lands harder here. A warranty is priced risk. On hardware you never chose, sold by a listing that may not exist next month, the risk is unpriceable, so the boundary is not fine print. It is the reason the job is safe to take at all.
One boundary case deserves its own sentence on the quote: if the fixture fails at first energization, the diagnosis visit is billable. Dead-on-arrival is the most common failure mode for marketplace fixtures, and proving the fixture is dead, rather than the circuit, is real diagnostic work. Name the charge up front and the doorstep conversation never happens.
The trip charge and the policy line on the quote
The last leak in these jobs is the visit that ends before it starts. The carton is missing the downrod. The fan needs the sloped-ceiling adapter nobody ordered. The chandelier arrived with no canopy screws and an instruction sheet in a language the diagrams do not match. You are standing in the foyer with a ladder and no job. If the quote said nothing about this, the visit is a write-off. If the quote carries a trip charge for a job that cannot proceed because the supplied fixture is incomplete or incorrect, the visit is billed, and more usefully, the charge changes the customer's behavior. People who know the incomplete-carton visit costs money open the carton the day it arrives.
Put the whole policy on the quote itself, not in the doorway conversation. Three lines do it: the flat install price for a customer-supplied listed fixture, the workmanship-only warranty boundary, and the trip charge for a supplied fixture that cannot be installed on arrival. An electrical quote gets a specific advantage here, because this policy has a code section behind it. A quote that says customer-supplied fixtures must carry a listing mark, per NEC 110.3(B), reads as a professional standard rather than a preference, and the customer who pushes back is now arguing with the code, not with you.
The shape of this policy is not unique to electrical work. We made the same argument for plumbers and customer-supplied fixtures, where the exposure is a failed faucet and a wet ceiling. The electrical version carries a sharper edge, because the failure mode is fire and the gatekeeper is an inspector, which is exactly why the electrician's version of the policy leans on the listing rule first and the price second.
Worked example: the same ceiling fan, supplied two ways
Example, with illustrative numbers: a customer wants a 52 inch, 22 pound ceiling fan hung where a flush-mount light is now. Priced as a supplied job, the shop sells the fan at $245 against a $189 supply-house cost, and bills $220 of labor for the swap, a $465 total. The $56 of fixture margin is not decoration. It absorbs the strip-out screw and the second trip to the truck, and it funds the callback the shop would eat in the first year.
Now the customer orders the same class of fan online for $164 and asks for install-only. The listing check comes back clean, so the job is on. The flat customer-supplied install price is $285, higher than the $220 labor line above, because it now carries the assembly of a boxed fan, the dead-on-arrival risk at first energization, and zero margin cushion. The site visit finds the existing box unrated for fan support, so the fan-rated box goes on the quote as its own $95 line, named before the old fixture comes down, approved by text before the work continues. The total is $380, the customer saved money against $465, and every hour on the job paid the rate it was supposed to pay.
Run the same carton through the other branch: no mark on the fan body, no instruction sheet, seller listing gone. The job stops at the photo, before the truck rolls. The offer goes out the same morning: a listed equivalent, supplied and installed for $455 on paper. Maybe the customer takes it, maybe not. Either way the shop never owns a fixture the code says it cannot sign for.
Put the policy on the quote before the phone rings
We built EosLog's quote generator so an electrical quote can carry the lines this guide argues for: a named customer-supplied install price, the workmanship warranty boundary, and the trip charge, with the code reference where the customer can read it.
Try the free electrical quote generator
No account required. You can also create a free EosLog account to save the policy lines and reuse them on every quote, or see the plans first.
Sources and further reading
- U.S. Occupational Safety and Health Administration, 29 CFR 1910.303, Electrical, General (listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling; suitability of equipment may be evidenced by listing or labeling).
- National Fire Protection Association, NFPA 70, National Electrical Code (Article 110 requirements for approval, examination, and use of equipment, including installation per listing and labeling instructions; Article 314 requirements for outlet boxes supporting luminaires and ceiling-suspended paddle fans, including listing and marking for fan support and weight limits).
- Electrical Safety Foundation International, Zero Tolerance for Counterfeits (counterfeit, unbranded, and unlisted electrical products can be made with substandard materials, lack proper testing, and can fail without warning).
- U.S. Bureau of Labor Statistics, Occupational Outlook Handbook, Electricians (median wage $29.98 per hour, $62,350 per year, May 2024).
This article is general information, not legal advice. Electrical code adoption and amendments vary by state and local jurisdiction, and code section numbering changes between editions. Confirm the requirements with your authority having jurisdiction and the current code edition adopted where you work before relying on this article for a specific job.