HVAC Change Order Form Template
A change order is one page that answers four questions: what changed, why, what it costs against the original contract, and how many days it adds. Signed by both sides before the work happens, it is an agreement. Signed afterwards, it is a receipt for something he did not agree to, and that is the version that turns into a dispute.
What goes on a change order
This form is deliberately short. A change order that takes twenty minutes to fill in is a change order that gets skipped on a job site, and a skipped change order is money you have already spent and will now have to ask for.
| Field | Filled in | What goes in it |
|---|---|---|
| Original contract number | Change order 1 to Q-1042 | The quote or contract number this changes. Without it a change order is just a second invoice nobody remembers agreeing to. |
| Reason for the change | Found: return plenum rusted through at the base, not visible until the old unit was out | One sentence on what you found or what he asked for. Separate the two: "found" and "requested" have different conversations attached. |
| Work added | Fabricate and install new return plenum | The new work, priced the same way as the original quote. Same units, same rate, so he can see it is the same yardstick. |
| Work removed | Credit: existing plenum reseal no longer required | Anything from the original scope that is no longer happening, as a credit. Leaving this out is how a change order starts to feel like a shakedown. |
| Net change to the price | $8,400 + $760 = $9,160 | Original contract total, plus or minus this order, equals the new total. All three numbers, on the page. One number on its own always reads as the worst of the three. |
| Days added to the schedule | 1 additional day | How much longer the job takes now, in days. Money is the part people argue about later; time is the part they get angry about on the day. |
| Signatures and dates | Contractor and homeowner, signed before work resumes | Both sides, dated, before the work starts. A change order signed after the fact is a receipt, not an agreement. |
Found or requested, and never both in one sentence
There are only two reasons a job changes. Either you found something once the old equipment was out, or the customer asked for something different. They feel completely different to the person paying, so name which one it is.
"Found" needs evidence. The rusted plenum, the undersized circuit, the flue that was hidden behind the old furnace. One sentence, plus a photo if you have one. He is being asked to pay for something he cannot see, and the reason has to be legible to somebody who is not a technician.
"Requested" needs a date. The upgrade he asked for on Tuesday, priced the same way as the original quote. Same units, same rate, so he can see it is the same yardstick rather than a new one applied now that the job has started.
Show the credit as well as the charge
Almost every change removes something. If the plenum is being replaced, resealing the old one is no longer happening. Put it on as a credit.
This is worth doing even when the credit is small. A change order that only ever adds money starts to feel like a mechanism rather than a document, and a customer who believes he is looking at a mechanism reads the next one much less generously. The credit line is the cheapest possible evidence that you are pricing the change rather than the opportunity.
Days matter more than money on the day
Money is what people argue about later. Time is what they get angry about right now, because somebody took a day off work, or the house has no heat, or the relatives arrive Thursday. Put the schedule impact in days on the form and say it out loud when you hand it over.
A change order that adds no days should say that too. "No change to the schedule" is a sentence worth printing, because in the absence of information people assume the worse of the two possibilities.
Both signatures, before the work
This is the whole point of the form and it is the part that gets skipped, usually with good intentions: he said go ahead, you were already holding the tool, stopping to write felt like theatre.
Six weeks later the invoice arrives and the conversation reconstructs itself. He remembers agreeing to look into it. You remember agreeing to do it. Neither of you is lying. The signature is not there because you distrust him. It is there because memories of conversations on a noisy job site are genuinely unreliable, including yours.
Two ways to use it
Fill it in and send it
This link opens the builder with every line above already on the quote: open the HVAC change order template with these lines in it. Put in your customer, your prices and your tax rate, and you have a signed page before the tool comes back out, not a surprise on the final bill.
The builder is the paid part of this site: $29 a month for the whole shop, never per technician, cancel yourself in one click. The price and the terms are on one page. The charts, the templates and the PDF below stay free either way.
Print it and write on it
If you would rather keep a pad of these in the truck, the blank version is a one page PDF with the same fields on it. No email, no sign up, no gate.
Download the blank HVAC change order PDF
Other templates
The contract this amends is usually the HVAC estimate template, or one of the job specific versions: the furnace installation quote or the AC replacement estimate. Writing the exclusions on the original quote is what makes a change order feel like a normal step rather than a surprise.
Copying a job you already quoted, changing what changed, and sending a fresh PDF from your phone is what the quote tool does. It costs $29 a month and it is on the pricing page in numbers.
Change order questions
What is a change order in HVAC work?
A short document that amends a quote or contract you have both already agreed to. It names the original contract, says what changed and why, prices the added and removed work, states how many days it adds to the schedule, and is signed by both sides before the new work starts.
When should a contractor write a change order?
The moment the scope changes and before the new work is done, even when the customer is standing right there saying go ahead. Verbal approval is real approval in the moment and worth very little six weeks later when the bill arrives and he remembers the conversation differently than you do.
Should a change order show the new contract total?
Yes, all three numbers: the original total, the change, and the revised total. One number on its own always reads as the worst of the three. Three numbers turn it into arithmetic he can follow, and arithmetic he can follow is much harder to be angry about.