ElectricalBossPro Blog — Billing & Payments

Billing a Whole-House Generator Install and the Maintenance Plan That Follows

A whole-house generator is one of the biggest tickets in residential electrical work, and it is also the start of a long relationship. The install is billed once. The maintenance is billed every year for as long as the customer owns the generator. Getting both sides of that right is what turns one big job into steady, predictable work.

Another Big Install, With a Tail

The EV charger guide, Invoicing an EV Charger Install From Approved Estimate to Paid, followed a one-time install from quote to payment. A generator install follows the same path at first, then keeps going.

In ElectricalBossPro, the install and the maintenance plan are both on the same client and the same house, so the history from day one is always in one place.

The Install Estimate

The estimate is built from your service list: the generator install at your price, plus the related lines you typically bill, such as a transfer switch or a whole-house surge protector. Equipment details for the generator and transfer switch can be filled in on the estimate, including brand, model, rating in kW and fuel type, such as natural gas or propane, so they carry onto the job.

Generator installs are a good place for an estimate template, so the standard lines are ready to go. The customer approves online, and the approved estimate becomes the scheduled job.

The Deposit

Generators are expensive equipment, and many shops ask for part of the price up front. In ElectricalBossPro, bill the deposit as its own invoice or line item on the client when the estimate is approved, labeled plainly, such as “Deposit — whole-house generator install.” The customer pays it online from the customer app or it is charged to the card on file if you have agreed to that.

How much to ask for and when is your decision. Putting it on the estimate means the customer knows before they approve.

Install Day and the Final Invoice

The generator job goes on the van that handles installs and generators. The tech sees the job on their phone with the services, equipment details and access notes, takes before-and-after photos, and taps Complete when the work is done.

The final invoice is created from the job with its line items and sales tax, and the office makes sure the deposit already paid is reflected, so the balance is clear. The balance is charged to the card on file if agreed, or the customer pays from the customer app. Both the deposit invoice and the final invoice are visible to the customer on their phone.

The Generator Is Saved on the House

Changes made on the job flow back to the house. The whole-house generator and transfer switch now sit on the property's equipment list with brand, model number, serial number, year installed, rating, fuel type, location and access notes.

This is what makes the maintenance plan easy. Every future maintenance visit fills in from the house with the “From House” picker, and the tech sees the generator details on the job card without anyone looking anything up.

Signing Up for Yearly Maintenance

The best time to offer a maintenance plan is right after the install, while the customer is thinking about keeping the generator ready. A customer can sign up for a yearly generator maintenance plan from the customer app, or through your website sign-up form, which captures their card. The office can also set the plan up on the client.

The plan is set as recurring work with 365 minimum days between visits. When the next visit comes due, it lands on the Waiting List map, where pins show not due yet, due now, or overdue past a seven-day grace. The office schedules it, the tech completes it, and it is billed like any other job, such as a $189 generator maintenance visit at your price, charged to the card on file at completion.

Why the Plan Matters to Billing

A generator install is a large, one-time invoice. A maintenance plan is a smaller invoice that comes back every year. Together they give a small shop both a big job now and predictable work later. Because the plan comes due on its own and bills at completion, nobody has to remember which customers are due for their yearly visit, and nobody has to send a separate bill. Plan billing in general is covered in Billing Electrical Maintenance Plans: Yearly Inspections and Generator Service That Bill Themselves.

One Customer, Many Invoices, One Record

From the first estimate to the tenth maintenance visit, the generator customer lives on one client with one house and one equipment record. The deposit, the final install invoice and every yearly maintenance invoice sit in the same history, visible to the office and to the customer in the customer app. To see how generator billing fits with the rest of the billing tools, visit the ElectricalBossPro electrical invoicing software page.