The tile is backordered nine weeks. The supplier offers a “basically identical” one that ships Friday. The homeowner texts back a thumbs-up, your crew installs it, and three weeks later the same homeowner says it never looked like the sample and wants it torn out. Without a signed material substitution change order, that tear-out is on you.
Substitutions happen on almost every job. Lead times slip, products get discontinued, a supplier runs short. The swap itself is rarely the problem. The problem is doing it on a handshake, a text thread, or a quick phone call, then living with the consequences alone.
What a bad substitution actually costs you
Here is how it usually plays out when the swap is not documented.
- You eat the price difference. The substitute costs more, or takes more labor to install, and nobody agreed to pay for it. Your margin on that line quietly goes negative.
- You own the redo. If the client later says they never approved it, you are the one who removed and reinstalled at your cost, plus the new material.
- Your schedule slips. A swap that needs different fasteners, blocking, or a longer cure time can push the trades behind you. Those delays land on your desk.
- Trust takes a hit. A client who feels surprised does not stay a fan. They stop returning calls, hold back the final payment, and leave the review you dreaded.
- Warranty gets murky. When something fails, the first question is what was specified and what was installed. If the paper trail does not match, you are arguing from memory.
None of this needs a bad client. It only needs a gap between what the plans said and what went in the wall.
6 material substitution change order mistakes that get contractors burned
1. Treating “or equal” as permission
“Or equal” language in a spec does not mean the owner agreed to your pick. Equal to whom, judged by whom? If you decide it is equal and the architect or homeowner disagrees, you carry the cost. Get the substitute approved in writing before it is ordered.
2. Approving by text message and nothing else
A thumbs-up on a text is better than nothing, but it rarely says the price, the product, the lead time, or what happens to the contract total. Six weeks later nobody remembers what it covered. A proper change order pins all of that down in one signed page.
3. Hiding the price difference
Some contractors absorb a small upcharge to keep the peace, then never stop absorbing. Even a credit back to the client should be written up. A deductive swap that is not documented turns into a client who expects a credit you did not offer, or a supplier invoice that does not match the contract.
4. Ignoring the labor side
Material cost is only half of it. A wider plank, a heavier fixture, or a different substrate can change install time, tools, and prep. Price the labor delta in the same change order, not as an afterthought you try to bill later.
5. Skipping the sample and spec sheet
Say “similar color” and you have said nothing. Attach the manufacturer, model number, finish, and a photo or spec sheet. When the client signs, they are signing a specific product, not a vibe.
6. Forgetting the schedule impact
A substitution often exists because of a delay, so the days matter. If the swap adds or removes days, state that on the change order. Silence on time is how you end up blamed for a late finish you did not cause.
The right way: write the substitution down before you order
A good substitution change order is short. It answers five questions on one page: what was specified, what is replacing it, what does it cost (up or down), what happens to the schedule, and who approved it. Here is a simple checklist you can reuse:
- Name the original product and the reason it cannot be used (backordered, discontinued, code issue).
- Name the substitute with brand, model, finish, and a photo or spec sheet.
- State the material price difference, as an add or a credit.
- State the labor difference, if any.
- State the schedule impact in days, even if it is zero.
- Get a signature and a date before the material is ordered.
Take a real example. A GC is finishing a bathroom and the specified 12x24 porcelain tile is backordered ten weeks. The supplier offers a comparable tile that is $1.40 per square foot cheaper but needs a different thinset. The change order lists both tiles, shows the credit on 90 square feet, adds a line for the thinset, and notes that the swap saves about three weeks. The homeowner signs, the total drops by a known amount, and nobody argues at closeout.
Now you need a place to put it. You have two free options, and both do the job.
If you like working in a spreadsheet, grab the free Excel change order template. It has line items for the original and substitute material, markup and tax calculated for you, and a running log so every swap on the job is tracked in one place. It costs nothing and works on any project.
Grab the free Excel change order template
A professional, auto-calculating change order spreadsheet — line items, markup, tax and your revised contract value all worked out for you, plus a log to track every change order on the job. Free to download and use on any project.
Download the free Excel template →Pricing the swap fairly
A substitution is not a chance to pad the job, and it is not a favor you eat either. Price it the way you would price any change. Take the new material cost, subtract the old, add or remove labor, apply your normal markup and overhead, and show the net. Clients rarely fight a number they can follow line by line. If you want a refresher, see our guide on material price increase change orders, which covers what to do when the cost moves before you have even ordered.
If the client is supplying the replacement themselves, that is a different animal with its own risks. Read our post on owner-supplied materials before you agree to install something you did not buy.
Get it signed while the client is still paying attention
The best time to get approval is the moment the problem shows up, not a week later when the crew is standing around. That is where the digital route helps. With the free ChangeOrdersPro tool, you fill in the swap, hit send, and the client signs from their phone in about 30 seconds. The contract total updates on its own, and you have a dated record of who approved what. It is the same one-page change order, just faster to close.
A signed record also protects you against the risk covered in unsigned change order risks. If it is not signed, it is a conversation, not an agreement. Curious why both options cost nothing? See why ChangeOrdersPro is free.
Skip the Word doc. Send it in 30 seconds.
ChangeOrdersPro turns this into a 30-second job — fill in the change, hit send, and your client signs from their phone. The contract total updates itself. It’s 100% free.
Create a free change order →Quick recap
Substitutions are normal. Undocumented substitutions are expensive. Name the original, name the replacement, show the price and labor change, note the days, and get a signature before anything is ordered. Whether you use a spreadsheet or your phone, the habit is what saves the margin. For more guides on keeping jobs profitable, browse the ChangeOrdersPro blog.
Frequently asked questions
Do I need a change order for a material substitution?
Yes, whenever the swap changes the price, the schedule, or what the client is getting. Even a no-cost swap is worth a signed page, because it proves the client approved the specific product that went in.
Who pays when the specified material is backordered?
It depends on your contract. Many contracts leave lead-time risk with the contractor unless the client agrees to a change. Whatever your contract says, write down the substitute, the price difference, and who agreed to it before ordering.
Can I use a text or email as approval for a substitution?
A text or email is better than a verbal okay, but it often leaves out the price, model number, and schedule impact. A signed change order captures all of it in one place and is much easier to point to later.
Is there a free way to create a substitution change order?
Yes. You can download the free Excel change order template and fill it in yourself, or use the free ChangeOrdersPro digital tool to send it and get it signed from a phone. Neither costs anything.
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.