Change orders for HVAC companies: the mid-job add-on, agreed before the work

When a change comes up on an HVAC job

The quote describes the job the way it looked from the office. The job looks different with the panel off. Four kinds of change come up on HVAC work, and none of them is on the quote.

What the tech finds

A run capacitor that reads low during a coil cleaning. A contactor with pitted points. A blower motor drawing more than its plate allows. A cracked heat exchanger found on a furnace tune-up. The tech came for one thing and found a second.

Code and inspection items

A line set that will not pass inspection and has to be replaced rather than reused. A disconnect the inspector wants within sight of the unit. A float switch on the condensate line. The customer did not ask for any of it, and the job does not close without it.

What the customer asks for

A smart thermostat, since the tech is there. A second return in the room that never cools. A media filter cabinet. These are the easy ones to lose, because the customer said yes out loud and nobody wrote the price down.

Parts on the truck

Capacitors, contactors, float switches, a universal thermostat, condensate tablets. The part is on the truck and the fix takes twenty minutes, which is why it gets done first and written down later, or not at all.

In California, a same-day service call has its own contract rules. One of the four conditions for a service and repair contract is that the contractor does not sell goods or services beyond what is reasonably necessary for the problem the customer called about. Sell past that, and the statute applies the full home improvement contract rules to the job, written change orders included, whatever the job's price. The California page has the statute.

Why a verbal yes does not hold

The customer says yes at the door. Two weeks later the invoice is higher than the quote, and the yes is a memory that two people remember differently. The question is never whether the work was done. It is what price was agreed, and by whom.

Two questions from contractors on a public payment-help forum say it in a line each. A Colorado contractor, 2018: the changes were agreed on verbally, but without a set dollar amount, and the contract said changes had to be in writing. A Texas remodeler, 2023: the owner asked for the extra work by email and text, the work was done, and the owner would not pay for it. A yes with no price and no new total is a conversation, not a change order, even when it is in writing.

The numbers are on the cost of verbal approvals page. One is enough here: in the 2026 Dodge Construction Network and Clearstory survey of nearly 200 US contractors, 77 percent of specialty contractors said they have had to write off change-order work as bad debt.

The federal ESIGN Act adds the legal half: under its consumer rules, an oral communication, or a recording of one, does not qualify as an electronic record unless another law provides otherwise. The e-signature page covers what does qualify.

The method on site: four steps

Four steps, on site, before the extra work starts. They fit in the time it takes to walk to the truck.

1. Say it in one line with one price. "Replace the failed run capacitor" and a number. One change, one line, one price. Two changes are two lines.
2. Show the new total. The customer approves a number they can see: the price of this change and what the whole job now comes to.
3. Get the signature on their phone or on the paper form. A finger-drawn signature or a typed name on their own phone, or ink on the form, before the work. Not a nod, and not a text that says ok with no price in it.
4. Put it on the job the same day. The line goes on the job before the invoice is built, so the invoice matches what the customer signed and the office never has to rebuild it from a text thread.

With the app for Jobber, the four steps are one screen for the tech, one link for the customer, and one line written to the Jobber job after the approval. On paper, the free template carries the same fields.

What to keep

Keep one record per change, with the job, and give the customer a copy. It holds:

• the change in one line, and the reason: what was found, or what the customer asked for
• the price of this change, and the new job total
• the effect on the schedule, if any
• who approved it, when, and how: a drawn signature, a typed name, or ink
• a photo of the failed part, if there is one

Under the ESIGN Act an electronic record meets a keep-a-copy rule when it accurately reflects the record and stays accessible to the people entitled to it, in a form that can be reproduced later. A screenshot of a text thread is a poor fit for that. A record built for the purpose is a good one.

Where it lands in Jobber

Jobber's help center, read 2026-09-22, has no change-order feature to point to. Its quotes section covers quote basics, templates, approvals, optional line items and converting a quote to a job, and nothing on change orders. Its Quote Approvals article says that if an approved quote is edited, the client's signature is removed from the quote and from client hub, and the earlier signed version is kept as a PDF in an internal note. So editing the quote to add the capacitor does not record an approval. It deletes one.

Shops feel this. A Jobber user asked on Jobber's community, in November 2024, how to add a change order to a job already under way without making a new quote. When the thread was read on 2026-09-22 it had no reply.

Volta Change Orders is an app for Jobber, coming to the Jobber App Marketplace. The tech says or types the change and its price on the phone, adds a photo if it helps, and sends the customer a text with one link. The customer sees the job, the change, the price of this change and the new total, signs with a finger or types their name, and taps Approve. Nothing is written to Jobber until then. After the approval, one line is written to the Jobber job, with a note naming the change, who approved it and when. Nothing already on the job is edited or removed. When you invoice the job, Jobber carries the line onto the invoice the same as any other line; the app does not touch invoices. If the customer declines, they can say why, and nothing is written.

The product page has the walkthrough. The help center has the setup guide and the fixes, in English and in Spanish.

The free template

For a shop on paper, or on a system other than Jobber, the free change-order template is one page with the fields above: description of the change, reason, price of this change, new job total, effect on the schedule, payment for this change, and both signatures with printed names and dates. It comes as a PDF, as a Word file, and as a page you can fill in from the browser. It is a general form, not legal advice; check your state's home-improvement contract rules.

Questions

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