How to Price a Job When the Customer Supplies Materials
When a customer supplies materials, raise your labor rate to recover the margin you lose, state clearly that your warranty covers workmanship only, and put in writing that shortages, defects, wrong items, and return trips are billed as additional time. Many operators decline customer-supplied materials entirely for warranty-sensitive work — and that's a legitimate policy, provided you say so before quoting rather than after.
What you’re actually giving up
Material margin isn’t just a markup you tack on for fun. It funds sourcing, the return trips when something’s wrong, warranty exposure, the relationship with a supplier who’ll help you out in a pinch, and the risk that the part fails down the road.
Take that away and you’re doing the same job for less while carrying more hassle. So the labor rate has to move.
Three things to put in writing
- A labor-only rate — higher than your installed-work rate, stated as such
- Workmanship-only warranty — you can’t warrant what you didn’t source
- Shortage and defect terms — wrong, missing, or defective items get billed as time
Get all three on the quote, not discovered later after the fact.
Expect the material to be wrong
Wrong size, missing hardware, an incompatible fitting, one box short — it happens on a good chunk of customer-supplied jobs, and not because customers are careless. Picking the right materials is genuinely part of the trade, whether people realize it or not.
A stated return-trip and wait-time rate just makes that a normal outcome instead of an argument.
Ask them to have everything on site before day one
Delivered, unpacked, and checked against the list. Half the delays on these jobs come down to the customer discovering the shortage at the exact same moment you do.
Sending a materials list ahead of time also quietly shows off the expertise they thought they were buying around.
Warranty is where this gets serious
For anything with real failure cost — roofing, plumbing supply, electrical, structural — a customer-supplied part is a liability you honestly can’t price. Declining it is a perfectly reasonable call.
The rule is just to have that policy set before the conversation starts, so it never lands as a surprise on someone who’s already bought the materials.
The middle path: you supply the critical parts
Let the customer pick the fixture, the tile, the light — you supply the fasteners, adhesives, connectors, and anything else that’s failure-prone. They get the look and the savings they wanted, and you keep control of everything the job’s integrity actually depends on.
It’s the version most experienced trades land on eventually, and customers take to it fine once you explain it that way.
Frequently asked questions
Should I raise my labor rate on customer-supplied jobs?
Yes. Material margin is a real part of what makes an installed price work, and removing it without adjusting labor means doing the same job for meaningfully less. A stated labor-only rate, higher than your normal installed-work rate, is standard and defensible.
What happens to my warranty?
It shrinks to workmanship only, and you should say so in writing on the quote and the invoice. You cannot warrant a part you didn't select or source, and a customer who understands that up front is far easier to deal with when the cheap fixture fails in year two.
What if they buy the wrong thing?
Bill the wasted trip and the wait as time, at a rate stated in advance. Wrong sizes, missing hardware, and incompatible parts are the norm rather than the exception on customer-supplied jobs — pricing that risk beforehand keeps it from being your loss.
Can I just refuse customer-supplied materials?
Yes, and for warranty-critical work many trades do. What matters is saying it before you quote — a policy stated up front is professional; the same refusal after a customer has already bought a truckload feels like a bait-and-switch.