13 plumbing add-on services to offer at the right moment (and when to hold back)

Plumbers get a bad reputation for upselling because many add-ons are pitched before the customer has a reason to want them. These thirteen start from the opposite end: each begins with something you saw, tested or heard in the house. They suit plumbing companies from one truck to a dozen, and they pair with a CRM that logs each offer and the customer's answer, so a "not now" in October becomes a reminder in April. For the bigger picture on this trade, see our plumbing industry page. New to the trade as an owner? How to start a plumbing business covers the setup. For upsells across every trade, read upsell ideas for service businesses. We leave prices out on purpose, because yours depend on your market and your costs.

1. Water heater flush and inspection

When to offer it: any time you are working near a tank-style water heater, or the customer mentions rumbling, slow recovery or rusty hot water. How to say it: "While I'm here, I can flush the tank and check the relief valve and the anode, which takes about as long as a coffee." The honest limit: do not open the drain on an old tank without warning the customer first. Corroded drain valves can fail or leak once disturbed, and the customer deserves to hear that before you start. Follow the manufacturer's manual for the flush steps and the interval, and tell the customer when a tank looks near the end of its life instead of flushing it.

2. Shutoff valve replacement

When to offer it: the moment a fixture stop will not turn, drips from the stem or has to be forced. If you had to shut off the whole house to finish the job, that is the best evidence you will ever have. How to say it: "That valve didn't close, so I had to shut off the whole house. I can swap in a new one in a few minutes, so the next shutoff only affects that fixture." The honest limit: do not replace stops that close and seal. Suggest the customer work each shutoff handle a couple of times a year to keep it from seizing, and note the location of the main in your job record.

3. Water-saving showerheads and aerators

When to offer it: when you are already replacing a showerhead or a faucet, or when the customer says the water bill is high. The EPA's WaterSense program labels showerheads that use no more than 2.0 gallons per minute and passed spray-force and coverage tests; the EPA notes that standard showerheads typically use 2.5. How to say it: "These come in a labeled water-saving model that still tests for good spray. Want to feel one before you decide?" The honest limit: do not promise a specific savings, and leave the old fixture if the customer tries the new one and dislikes it. Look up the exact model in the EPA's WaterSense product search before you tell a customer it carries the label.

4. House water pressure check

When to offer it: at every visit with access to a hose bib or a laundry valve. Thread a gauge on, read it, and write the number on the invoice. How to say it: "I checked your pressure on the way out. It's [reading], and here is what I look for." The honest limit: a reading is a fact, and a pressure reducing valve is a recommendation only when the reading is above what your local code and the fixture makers allow. Look those limits up yourself before you write any number in a customer-facing template. Pressure also swings during the day, so a single reading at noon does not prove anything on its own. Offer to recheck at a different hour when the number is borderline.

5. Sewer camera inspection

When to offer it: after a second main-line clog in the same house, when roots are the likely cause, or when a buyer wants the line checked before closing. How to say it: "Clearing it fixes today. A camera shows why it keeps backing up, and you get the video." The honest limit: do not sell a camera for a one-time clog with an obvious cause, such as a grease plug in a kitchen line. Give the customer the recording, mark where the pipe changes or fails, and say what you could not see. Save the file to the customer's record in your custom CRM so next year's technician does not start over.

6. Leak detection and automatic shutoff valves

When to offer it: after a burst pipe or supply line failure, for second homes, and for customers who travel for weeks. How to say it: "If a supply line lets go while you're away, this valve closes the main and texts you." The honest limit: a shutoff device does not fix a leak, needs a working power supply and, on many models, a Wi-Fi connection, and the customer has to respond to its alerts. Say so before the sale. Do not promise it prevents water damage in every case. Offer it when the failure just happened in this house, not as a scare tactic on a job that has nothing to do with it.

7. Backflow assembly testing

When to offer it: for lawn irrigation systems and other connections where your water utility requires an annual test. How to say it: "Your utility requires this test [how often]. I can do it and file the report." The honest limit: only offer it if your state certifies testers and you hold the certification. The EPA notes that rules on allowed assemblies, testing frequency and tester certification vary from state to state, and that water utilities may need legal authority to require customers to install and maintain assemblies. Check your utility's rules before you promise a customer anything. Put the test date in your CRM so you can send the reminder before the utility's deadline.

8. Sump pump check and battery backup

When to offer it: in spring before the wet season, after a storm, or during any basement visit where you can see a pit. How to say it: "Let me pour a bucket in and make sure the pump kicks on and the float moves freely." The honest limit: if the house has no pit, you have nothing to sell. A battery backup keeps a pump running for a limited time during an outage, and the length depends on the battery and how hard the pump works, so tell the customer it buys time and does not replace a generator. Do not promise a dry basement. Surface water from a grade or gutter problem needs a different fix, and you should say so.

9. Frost-free hose bib replacement

When to offer it: in the fall, when you see an old hose bib with a hose still attached, a drip, or no sign of a frost-free design. How to say it: "That spigot can freeze and split inside the wall. A frost-free one is a short job, best done before the first cold snap." The honest limit: if the existing bib is a working frost-free model, give the customer a winterizing reminder instead of a replacement: disconnect hoses and close the interior shutoff where there is one. Photograph the old bib and its pipe if you can reach them, so the customer sees what you saw. This add-on belongs on an October reminder text, not on every job.

10. Water testing, filtration and softening

When to offer it: when the customer names a problem you can see: scale on fixtures, white buildup on the heater, spotted dishes, taste or odor. How to say it: "Let's test what you actually have before choosing equipment." The honest limit: do not make health claims, and do not sell a system against a problem nobody has. For health-related contaminants, send the customer to a state-certified lab or their water utility's report. Tell them what a softener does and what it needs to keep working, such as salt and drain access, so the sale does not turn into a callback. Test results go in the job record next to what you recommended.

11. Expansion tank with a water heater replacement

When to offer it: when you replace a heater on a closed system, such as a house with a backflow preventer or a pressure reducing valve at the meter. How to say it: "Your system is closed, so the extra water has nowhere to go when the heater warms up. This tank gives it somewhere to go." The honest limit: whether the tank is required comes from the heater maker's instructions and your local code. Confirm both before you quote. If it is required, it is part of the job and belongs in the base estimate, not in an add-on conversation. If it is optional, explain why you recommend it and let the customer decide.

12. Washing machine hose and supply line replacement

When to offer it: when you move a washer, replace a laundry valve, or see rubber hoses that are bulging, cracked or rusted at the fittings. How to say it: "These hoses are old. Replacing them takes five minutes while I'm here." Braided supply lines are an upgrade you can show in your hand. The honest limit: do not tell the customer an intact hose will fail soon; you cannot know. Say what you see, note the age if there is a date stamp, and let the customer choose. Mention the shutoff valves behind the washer, since a stuck one is the real reason many hose swaps do not happen.

13. Annual plumbing check as a maintenance plan

When to offer it: at the end of a job that went well, once the customer has seen how you work. How to say it: "Once a year, I can come and run through the water heater, the valves, the pressure and the drains, and you get priority when something breaks." The honest limit: sell a plan only if you will actually show up on schedule, and write down what each visit includes so nobody is surprised. Do not stack unrelated services into a plan to make it look bigger. Recurring visits need a system to schedule and remind them; our guide to maintenance plan ideas covers what to put in one.

Where to start

Add them one at a time. These three need no new equipment and almost no training:

1. Add-on 2, shutoff valves. The evidence is in your own hand, because you had to shut off the main.
2. Add-on 1, the water heater flush. Train the techs to look at the heater on every visit and to say the sentence once.
3. Add-on 13, the annual check. It brings customers back and gives every other add-on a second chance next year.

Record each offer and the customer's answer on the job. That is the part most shops skip, and it is where a CRM built for your company pays off, because declined add-ons become next season's reminders.

Frequently asked questions