What to Do With Plumbing Jobs Outside Your Specialty

Not Every Call Is Your Call

I am a residential plumber. I have been doing this for over eighteen years. I do water heaters, repipes, fixtures, drain cleaning, and general residential service and repair. That is my lane, and I am good at it.

But at least once a week, someone calls me with a job that is outside my scope. A restaurant owner needs a grease trap installed. A homeowner wants a gas line run to their new outdoor kitchen. Someone has a collapsed sewer lateral that needs excavation and a camera crew. A property manager needs backflow testing on a commercial building.

Early in my career, I handled these calls badly. I either tried to take the job anyway and got in over my head, or I just said “Sorry, I do not do that” and hung up. Both were mistakes. Taking on work you are not qualified for is dangerous and can cost you your license. But just turning people away without helping them is a missed opportunity: for the customer, for the specialist who could have gotten the work, and for you.

What I learned over the years is that plumbing jobs outside your specialty are not problems to avoid. They are opportunities to strengthen your reputation, build relationships with other pros, and sometimes earn a referral fee for connecting the right people.

Building a Go-To List of Specialists

The first thing I did was build a short list of specialists I could refer work to. Not a long list. A short, trusted list. For each specialty area outside my scope, I wanted one or two people I would stake my name on.

4 specialties every residential plumber should have a referral for

1. Commercial plumbing. Restaurant buildouts, multi-story risers, commercial water heaters, grease traps, backflow certification. Commercial work has different codes, different fixtures, and different insurance requirements. If you are not set up for it, do not wing it.
2. Gas line work. Many states require a separate gas license or endorsement. Even if you are technically allowed to do gas work in your jurisdiction, if you do not do it regularly, you should know someone who does. Gas mistakes can kill people. This is not the place to learn on the job.
3. Sewer and excavation. Camera inspections, trenchless relining, spot repairs requiring excavation, sewer lateral replacements. This work requires specialized equipment (cameras, locators, sometimes a backhoe) and the experience to interpret what the camera shows. A plumber who does not own the equipment and does not do this weekly should not be bidding it.
4. Water treatment and filtration. Whole-house water softeners, reverse osmosis systems, well water treatment. This is a niche with its own product knowledge and installation standards. Customers asking about water quality deserve someone who specializes in it.

How to find specialists you trust

Start with people you already know. If you have been in the trade for any length of time, you have crossed paths with gas fitters, sewer guys, and commercial plumbers at supply houses, on job sites, or through your local plumbing union or trade association.

Ask the guys at the supply house counter who they see buying commercial parts or specialty fittings. Those guys know everybody. Ask other tradespeople you work with (electricians, HVAC techs, general contractors) who they refer plumbing specialties to.

When you find a potential referral partner, do not just add them to your phone. Have a real conversation. Tell them what you do, what you do not do, and that you want to start sending them the calls that are outside your scope. Ask about their licensing, their insurance, their typical response time, and how they treat customers. Your name is attached to every referral you make.

I keep my list simple. I have one guy for sewer work, one company for commercial, and one licensed gas fitter. For each one, I know their cell number, their typical availability, and roughly what they charge. When a call comes in that fits their specialty, I can make the connection in sixty seconds.

Negotiating a Referral Fee When You Connect a Customer to Another Pro

Once you start sending work to specialists consistently, it makes sense to talk about a referral fee. This is standard practice in the trades and there is nothing shady about it. You are delivering a qualified, warm lead to another professional. That has real value.

What a typical referral fee looks like in plumbing

In my experience, referral fees between plumbing specialists usually fall into one of two structures:

• Percentage of the job. Usually 5% to 15% of the total job value. For a $3,000 sewer repair, that is $150 to $450. The percentage tends to be lower on bigger jobs and higher on smaller ones.
• Flat fee per referral. A set amount regardless of job size, typically $50 to $200. This is simpler and works well for service calls or smaller jobs where calculating a percentage feels like overkill.

The key is to agree on the terms before you start sending work. Do not send three referrals and then bring up money after the fact. That creates awkwardness and resentment. Have the conversation early, keep it straightforward, and get on the same page about the fee, when it gets paid, and what counts as a referral.

How to bring up the referral fee conversation

I know a lot of plumbers feel uncomfortable talking about referral fees. It feels transactional. But the reality is that if you are sending someone qualified customers, you are saving them marketing money and acquisition effort. A referral fee acknowledges that.

Here is roughly how I have had that conversation: “Hey, I am getting a fair number of calls for sewer work that I do not do. I would like to start sending those your way. Would you be open to a referral arrangement where I get ten percent of the job when it closes?”

Every specialist I have asked has said yes, because the math is obvious. They are getting a customer who already trusts them because I vouched for them. That customer is way more likely to close than someone who found them on a random Google search. A 10% referral fee is cheaper than what they would spend on advertising to get the same lead.

The part that used to be messy was tracking which jobs came from my referrals and making sure the fee actually got paid. I would send someone a customer, forget to follow up, and three months later realize I never got my cut. That is where something like PureIntro helps. It lets you set up the referral fee agreement upfront and tracks the referral through to payment, so neither side has to chase the other.

Maintaining Customer Trust When You Hand Off to Someone Else

This is the part that matters most, and the part most plumbers get wrong. When a customer calls you, they trust you. They may have gotten your number from a neighbor or found you through a review. Either way, they reached out to you specifically because they believe you can solve their problem.

When you tell them you cannot do the job, that trust does not just transfer automatically to whoever you refer them to. You have to manage the handoff carefully.

What I say when I refer a customer to a specialist

I never just say “Call this guy” and leave it at that. Here is what I actually do:

• Explain why I am referring them out. I tell the customer exactly why this job is outside my scope. “Sewer lateral replacements require a camera crew and excavation equipment that I do not carry. My guy Mike does this every day and he is licensed and insured for it.” Honesty builds more trust than pretending you can do everything.
• Vouch for the person by name. I do not give them a list of three names and say “pick one.” I give them one name and tell them why I trust that person. “I have been sending Mike sewer jobs for five years. He does clean work, shows up when he says he will, and his prices are fair.”
• Make the introduction directly. Whenever possible, I call or text the specialist myself and give them the customer’s name, number, and a brief description of what they need. Then I text the customer and say “Mike will be calling you shortly.” This is faster and more personal than just handing over a phone number and hoping they connect.
• Set expectations. I tell the customer roughly what to expect in terms of timeline, cost range, and process. Not because I am the expert on sewer work, but because I know enough to give them a ballpark so they are not walking in blind.

Why the handoff matters for your reputation

Your referral is your endorsement. If the specialist does a bad job, the customer is going to remember that you sent them there. That is why the go-to list I talked about earlier is so important. You need to know, not guess, that the person you are referring to will treat your customer right.

On the flip side, a good handoff strengthens your reputation even though you did not do the work. The customer thinks, “My plumber could not do this job, but he connected me with someone who did it perfectly.” That is a positive experience. That customer is going to call you for their next residential plumbing job, and they are going to tell their friends about you.

I have had customers thank me more for a good referral than for jobs I actually did myself. Because they were stressed, they did not know who to call, and I solved their problem even though it was not my kind of work.

Following Up After a Referral to Make Sure the Customer Was Taken Care Of

This is the step most plumbers skip entirely, and it is the one that separates professionals from everyone else. Once you make a referral, you are not done. You need to close the loop.

3 follow-up steps that protect the relationship

1. Check in with the customer. A day or two after the specialist should have made contact, send the customer a quick text: “Hey, just checking in. Did Mike reach out about the sewer line?” If they say no, you call Mike and get it sorted. If they say yes and everything is moving, you look like a pro who cares. Either way, you stay in the loop.
2. Check in with the specialist. After the job should be done, reach out to your referral partner: “How did the Jones job go? Everything clean?” This does two things. It tells the specialist you are paying attention, which keeps them on their best behavior with your customers. And it gives you information you can use when the customer calls you next.
3. Circle back with the customer after the work is complete. A week after the job is done, send a final text: “Hey, how did the sewer job turn out? Was Mike good to work with?” This is your quality control. If the customer had a great experience, perfect. You have reinforced your value. If something went sideways, you find out now instead of hearing about it through a bad review or a lost future customer.

What to do if the referral goes badly

It happens. Not often if you have vetted your people well, but it happens. The specialist is late, overbills, does sloppy work, or just does not communicate well with the customer.

When it does, you own it. Not the problem itself, but the relationship. Call the customer, apologize for the experience, and offer to help them find a resolution. Sometimes that means calling the specialist and having a direct conversation about what went wrong. Sometimes it means finding another specialist for the job.

Either way, the customer needs to see that you stand behind your referral. And if a specialist burns one of your customers, they come off your list. You do not get a second chance with someone else’s trust.

Turning Out-of-Scope Calls Into a Referral System

When you put all of this together (the specialist list, the referral fee agreements, the careful handoff, and the follow-up), what you end up with is a system. Not a complicated one. Just a reliable way to handle the calls that are not your job without losing the customer.

• You answer every call. Even the ones outside your scope. Every call is a chance to help someone and strengthen a relationship.
• You connect the customer with the right person. Not any person. The right person. Someone you have vetted and trust.
• You earn a fee for the connection. Because you delivered a qualified customer to a specialist who would have had to spend money finding that customer on their own.
• You follow up to make sure it went well. Because your reputation is attached to every referral you make.

The referrals flow the other way, too. The sewer specialist who gets steady work from you starts sending residential service calls back to you. The gas fitter refers homeowners who need general plumbing. Over time, these relationships become a real pipeline of work in both directions. For more on building those kinds of trade relationships, read about growing a plumbing business through word of mouth.

Every call that used to be a dead end (“Sorry, I do not do that”) becomes a touchpoint that keeps your name in the customer’s phone and money moving through your network.

If you want a simple way to set up referral fee agreements with specialists and track which jobs close, take a look at what PureIntro offers for home services professionals. It handles the agreement and the payment so you can focus on the work.

This post reflects one professional’s experience and is for informational purposes only. It is not business, legal, financial, or professional advice. Results described are individual and not guaranteed. Referral fee arrangements may be subject to state and local regulations. Consult a qualified professional for guidance specific to your situation. PureIntro facilitates referral tracking and payment processing but does not guarantee payments between users or any particular business outcome.