6 owner supplied materials change order mistakes

The tile shows up on a Tuesday. The homeowner ordered it themselves to save a few bucks, and it is sitting in the driveway in eleven boxes when the layout calls for fourteen. Your tile sub is already on site. Your schedule says grout by Friday. And nobody has written an owner supplied materials change order, because nobody thought one was needed — the material did not cost you anything, right?

Three weeks later you are the one explaining why the job is late, why the sub charged a return trip, and why you are asking for money at the end instead of the beginning. That conversation is where owner supplied materials quietly turn into lost margin and a client who thinks you are nickel-and-diming them.

What owner supplied materials actually cost you

Owner supplied materials — OSM, client-furnished, "I found it cheaper online" — feel like free money on the estimate. You strip the material line out of your number and the bid looks sharper. What you do not strip out is the risk, and the risk almost always lands on your side of the table.

Here is the damage, in the order it usually shows up:

• Standby and return trips. A crew that shows up to a short delivery is a crew you pay for nothing. A framing or tile sub who has to demobilize and come back next week will charge you for it, and they should.
• Schedule ripple. One missing box of tile does not delay tile by three days. It delays tile, then grout, then the plumber's trim-out, then the punch walk, then your final draw.
• Receiving, handling and storage. Somebody unloads it, counts it, stacks it out of the weather and eats the loss if it walks off the site. That somebody is you.
• Warranty gaps. When the owner-bought faucet drips in month four, the client calls you, not the online retailer. You are covering the labor to pull and reinstall a product you never sold.
• Wrong, short, or damaged goods. Contractors order with a waste factor. Homeowners order exactly what the square footage says, and then a box arrives cracked.

Run the arithmetic on a small one. A two-man crew standing down for half a day plus a sub's return-trip charge plus three days of schedule slide is not a rounding error on a remodel — it is a real bite out of the job's profit, and it came from a material line you were not even paid to carry. Multiply that by the three or four owner-supplied items on a typical kitchen and you can see how a job that penciled at a healthy margin lands flat.

None of that is billable unless it is written down. That is the whole problem. If you want a head start on the paperwork, the free Excel change order template already has the line items and totals built out, and the free ChangeOrdersPro tool does the same job from your phone on site.

6 owner supplied materials change order mistakes

1. No owner-supplied clause in the contract at all

If your agreement does not say what happens when client-furnished material is late, short, wrong or damaged, then you are negotiating it in the middle of a crisis with somebody who is already unhappy. That is the worst possible time to bring up money. Cost: every OSM conversation on the job becomes a fight you start from behind.

2. Treating "no material cost" as "no change order"

This is the big one. Contractors write change orders for materials and forget that labor, delay and rework are the expensive part. The owner bought the vanity, so nobody prices the extra two hours to modify the cabinet run when the vanity turns out to be an inch wider than the spec. Cost: you absorb every hour of it, and you set the expectation that OSM problems are free.

3. Accepting delivery without counting it

If your guys sign for eleven boxes and the packing slip says fourteen, you now own that gap. Once you have taken delivery and stacked it in the garage, proving what actually arrived becomes your word against the retailer's tracking number. Cost: you eat the replacement, and the two weeks it takes to get it.

4. Not documenting the condition of the material on arrival

Owner-supplied product that is cracked, warped, mis-finished or the wrong SKU has to be flagged before anybody installs it. Install it anyway and it becomes your defect. Two photos and one line in the daily log is the difference between a supplier problem and a callback you pay for. Cost: a tear-out and reinstall on your dime, plus a client who now doubts your workmanship.

5. Logging the delay but never pricing it

Plenty of contractors are good at the daily log and terrible at converting it into money. You wrote "tile short, crew released 11am" on three different days and never turned any of it into a signed change order with a dollar figure and a time extension. Cost: perfect documentation of work you will never be paid for.

6. Saving it all up for the final invoice

The single most reliable way to get a change order refused is to hand over a stack of them at closeout. By then the client has mentally spent the budget, the goodwill is gone, and every line looks like an ambush. Writing it up weeks later also puts you in the weakest spot possible — see what usually happens with retroactive change orders. Cost: a disputed final payment, and sometimes the referral too.

The pattern behind all six is the same. The owner-supplied item costs you time, not material, and time is the thing contractors are worst at billing for.

The right way to handle an owner supplied materials change order

You do not need a lawyer and you do not need software you pay for. You need a clause, a habit, and a piece of paper that gets signed the same day. Here is the sequence that works on real jobs:

1. Put an OSM clause in the contract before you sign it. Plain language: the client is responsible for quantity, quality, fitness and timely delivery of anything they supply; the contractor will document what arrives; delay, rework, return trips and handling caused by owner-supplied material are billed as a change order at the contract's labor rate.
2. Get delivery dates in writing at the start. Ask for the order confirmation and the ship date for every owner-supplied item. Put those dates in the schedule as hard dates, the same way you would a dumpster or an inspection.
3. Count and photograph everything the day it lands. Quantity, SKU, condition, packing slip. Two minutes on a phone. Text the photos to the client so the record is shared, not just yours.
4. Write the change order the same day the problem appears. Not the same week. The same day, while the client still remembers the tile was short and before anybody has re-litigated whose fault it was.
5. Price the whole hit, not just the obvious part. Crew standby hours, sub return-trip fee, extra supervision, your markup, and a specific number of days added to the schedule. A change order that moves money but not the completion date will bite you at the end of the job.
6. Get a signature before the crew goes back. Verbal approval on site is worth nothing when the final invoice lands. Many states expect change orders to be in writing and signed, and it is good practice everywhere — here is a general rundown of change orders in writing.
7. Log it on a running sheet. One row per change order, with status and revised contract value, so you always know what is signed, what is pending, and what the job is actually worth today.

If the item is coming out of an allowance rather than being bought outright by the client, the same discipline applies — see how to handle an allowance overage change order so the difference gets billed instead of absorbed.

One note: this is general business information, not legal advice. Contract and notice requirements vary by state and by contract — confirm what applies to you with your state licensing board or a licensed attorney.

Two free ways to write the change order

If you work in spreadsheets: the free Excel change order template is a ready-made, auto-calculating sheet. Drop in your line items — standby hours, sub return trip, handling — and it works out markup, tax and the revised contract value for you. It comes with a change order log tab so you can track every OSM hit on the job in one place. Print it, sign it, file it. No account, no cost, nothing to install. Download the free change order spreadsheet and keep a copy in your job folder template so it is there on the next build.

If you want it signed before you leave the driveway: the free ChangeOrdersPro tool is the same document in digital form. Type the change on your phone standing next to the short pallet of tile, hit send, and the client signs from their own phone in about thirty seconds. The revised contract total updates itself and every change order on the job is logged automatically, so closeout is a summary instead of an argument. It is also free — create a change order and see why it costs nothing.

Same paperwork, two ways to get it done. Pick whichever one you will actually use on a Tuesday afternoon with a sub standing next to you, and browse the rest of the change order guides when you have five quiet minutes.

The 60-second OSM habit

Every owner-supplied item on your job gets four things: a delivery date in the schedule, a photo on arrival, a count against the packing slip, and a change order the moment reality stops matching the plan. That is it. Four steps, most of them under a minute.

Contractors do not lose money on owner supplied materials because clients are difficult. They lose it because the cost lands in labor hours that nobody wrote down, on a day when everybody was too busy to stop and do the paperwork. The paperwork takes less time than the argument.

Frequently asked questions

Should I write a change order if the owner supplied the material for free?

Yes, if it cost you anything. The material may be free to you, but the standby time, return trips, handling, storage and schedule delay are not. Those are the costs a change order captures. A change order with zero material cost and eight hours of labor is completely normal on owner-supplied work.

What should an owner supplied materials change order include?

A short factual description of what happened (short delivery, wrong SKU, damaged on arrival), the date, the labor hours and sub charges it caused, your markup, any time extension in days, the revised contract total, and a signature line for the client. Photos attached or referenced help a lot.

Is there a free change order template for this?

Yes. The free Excel change order template on this site is a ready-made spreadsheet with line items, markup, tax and the revised contract value calculated for you, plus a log tab to track every change order on the job. It is free to download and use on any project, with no account required.

Can I refuse to install owner-supplied material?

That depends entirely on your contract, so write the answer into it before the job starts. A common approach is a clause saying the contractor may decline to install owner-supplied material that arrives damaged, incorrect or non-compliant, and that any resulting delay is handled as a change order. Confirm your own contract language with an attorney.

Daisy Porter

Co-Founder, ChangeOrdersPro

Daisy writes about the unglamorous side of running a build — the paperwork, the change orders, and the conversations that keep a job profitable. ChangeOrdersPro is the free tool her team built so contractors can send a professional change order and get it signed from a phone in about 30 seconds.