How Plumbers Handle Revenue Sharing on Referred Jobs

Referral Fees Are How the Trades Have Always Worked

I have been doing residential plumbing for close to twenty years. In that time I have sent hundreds of jobs to other plumbers and specialists: gas line work, sewer laterals, commercial projects, backflow testing. Early on I did it for free because I thought that was just being a good colleague. It took me a few years to realize I was leaving real money on the table.

Revenue sharing on referred work is standard practice in the trades. It is not a side hustle or a gray area. When you send a qualified customer to another professional, you are handing them a warm lead that would have cost them real money to generate on their own. A referral fee acknowledges that value.

This post covers the fee structures I have used and seen other plumbers use, how payment timing works in practice, the difference between a handshake and a written agreement, and how to start the money conversation with another plumber or specialist.

Common Referral Fee Structures Between Plumbing Professionals

There is no single right way to structure a referral fee. What matters is that both sides agree on the terms before work starts changing hands. Here are the three structures I see most often in plumbing.

3 referral fee models plumbers actually use

1. Percentage of the job value. The most common structure. The sender gets a percentage of what the receiver bills the customer, typically between 5% and 15%. On a $4,000 sewer line repair, a 10% fee means $400 to the plumber who sent the job. The percentage tends to be lower on large jobs and higher on smaller service calls.
2. Flat fee per referral. A fixed dollar amount regardless of job size, usually $50 to $200. This works well for routine service calls where the job value is predictable. I have a standing arrangement with a gas fitter where I get $100 for every gas line job I send him. Simple, no math required.
3. Tiered structure. Different rates depending on job size. For example: $75 flat fee for jobs under $1,000, 10% for jobs between $1,000 and $5,000, and 7% for anything above $5,000. This is less common but works when you are regularly sending a mix of small service calls and bigger projects to the same person.

The right structure depends on what kind of work you are sending. If it is mostly similar-sized jobs, a flat fee keeps things simple. If the job values vary a lot (say you are referring out everything from a $300 gas valve replacement to a $12,000 sewer lateral), a percentage makes more sense because it scales with the work.

Getting Paid When You Send Work to a Specialist

Most of the referral fees I earn come from sending jobs to specialists. Gas line work is the big one. In my state you need a separate endorsement to run gas lines, and I do not carry it. So when a homeowner wants a gas line to their new outdoor kitchen or their tankless water heater needs a gas conversion, I refer it to my guy Tony.

Tony and I worked out a 10% referral fee years ago. When I send him a customer, he does the work, collects payment, and sends me my cut. On a typical $2,500 gas line job, I earn $250 for a five-minute phone call and a text to the homeowner introducing Tony. That is money I would not have made at all if I just told the customer “Sorry, I do not do gas work” and moved on.

Sewer work is the other big category. Camera inspections, trenchless relining, full lateral replacements. This is specialized equipment work that most residential plumbers do not have the gear for. The sewer guys I refer to are happy to pay 10% because a warm referral from a trusted plumber converts at a much higher rate than a cold lead from an ad. If you want to think through how to handle those out-of-scope calls systematically, I wrote about what to do with plumbing jobs outside your specialty.

When the fee gets paid

Payment timing matters more than most plumbers think about upfront. Here is what I have seen work:

• After the job is complete and the customer has paid. This is the most common and the most fair. The receiver does not pay you until they have been paid. Nobody is out of pocket.
• Net 30 after job completion. Some guys prefer to batch their referral fee payments monthly. If you are sending someone a lot of work, this can be easier for both sides than paying after every single job.
• On the spot for small jobs. For small service calls with flat referral fees, some plumbers just hand over the cash or send a quick payment the same week. No point in tracking a $75 fee for thirty days.

Whatever timing you agree on, the important thing is to actually agree on it. The number one source of friction I have seen in referral arrangements is not the fee amount. It is one side expecting payment in a week and the other side thinking they have ninety days.

Handshake Deals vs. Written Referral Agreements

I will be straight with you: most of the referral arrangements I had for my first ten years in business were handshake deals. “Send me gas work, I will pay you ten percent.” Done. And for a while, that was fine.

Then I had a situation where I sent a specialist a $6,000 job and never saw a dime. He said he forgot. I said we had an agreement. He said he did not remember the terms. There was no bad intent. We just had different recollections of a conversation from six months earlier.

That was the last handshake deal I made.

What a simple written agreement covers

This does not need to be a ten-page document. A written referral agreement between plumbers typically covers four things:

• The fee structure. Percentage, flat fee, or tiered, and the specific numbers.
• What counts as a referral. Does the customer have to mention your name? Do you need to make the introduction directly? Be specific so there is no argument later about whether a job “counts.”
• When the fee gets paid. After the job closes, net 30, monthly batch, whatever you agreed on.
• How long the arrangement lasts. Some guys set it up as ongoing until either side says otherwise. Others revisit it every year. Either way, both sides should know the terms are not set in stone forever.

A written agreement does not change the relationship. It just removes the chance of a misunderstanding down the road. I have found that the guys who are uncomfortable putting things in writing are usually the same ones who “forget” to pay. The good operators welcome it because it shows you are serious about sending them steady work.

How to Bring Up Money With Fellow Plumbers

This is the part that stops most plumbers from ever setting up a referral fee arrangement. They are already sending work to people they know and trust, but bringing up the money feels like it might change the dynamic.

It does change the dynamic, for the better. Here is why. When there is a financial arrangement in place, the person you are sending work to takes your referrals more seriously. They call the customer faster, they do better work, and they follow up because they know you are paying attention. The referral fee turns a casual favor into a business relationship, and business relationships are more reliable than favors.

What to actually say

I keep it simple and direct. Here is roughly how the conversation goes:

“Hey, I have been getting a lot of calls for sewer work lately, and I would rather send them to someone I trust than tell the homeowner to figure it out. I would like to set up a referral arrangement: I send you the work, and when the job closes, I get ten percent. Does that work for you?”

That is it. No buildup, no awkward dance. You are proposing a business arrangement that benefits both sides. The specialist gets a steady stream of qualified customers they did not have to find. You get compensated for delivering those customers.

Common responses and how to handle them

• “Ten percent is too much.” Then negotiate. Maybe 7% works. Maybe a flat fee makes more sense for their pricing model. The specific number matters less than having an agreement in place.
• “I have never done referral fees before.” That is fine. Explain that it is common in the trades and that you are just looking to formalize something that benefits both of you. Most people come around once they see the math: a 10% referral fee is a fraction of what they would spend on advertising to get the same lead.
• “Sure, let us just keep it informal.” This is where you push gently for something in writing. “I am happy to keep it simple, but let us at least text each other the terms so we both have a record.” Even a text message confirming the fee and payment terms is better than nothing.

One thing I have noticed: the conversation gets easier after the first one. The first time you bring up referral fees with a fellow tradesperson, it feels like a big deal. By the fifth time, it is just business.

Making the Money Part Run Smoothly

The biggest threat to a good referral arrangement is not the fee amount or the conversation. It is the tracking. You send someone a job in March, the work gets done in April, the customer pays in May, and by June nobody remembers who owes what. Multiply that by five or ten active referral partners and it gets messy fast.

I dealt with this for years using a spreadsheet and calendar reminders. It worked, barely. The problem was that I was always the one chasing. I would have to text the specialist to ask if the job closed, then follow up again to ask about the fee. It felt like I was nagging, and sometimes I just let smaller fees slide because the follow-up was not worth the hassle.

That is actually what led me to PureIntro. It lets you set up the fee agreement upfront, tracks the referral through to completion, and handles the payment. Neither side has to chase the other, and the terms are documented from day one. It took the friction out of getting paid, which is exactly what I needed.

What Referral Revenue Actually Looks Like for a Working Plumber

Let me put some real numbers to this so it is not abstract. In an average month I might send out four to six jobs that are outside my scope. A couple of gas line jobs, a sewer camera inspection or lateral replacement, maybe a commercial call I cannot handle.

If those jobs average $3,000 each and I am earning 10% on referral fees, that is $1,200 to $1,800 a month in referral income. That is not going to replace my plumbing income, but it is meaningful money for work I was already turning away. Over a year, that adds up to $15,000 to $20,000 from jobs I never touched a wrench on. For more on how consistent referral income adds up across the trades, read about growing a plumbing business through word of mouth.

The key is consistency. A one-off referral here and there is nice. A system where you have three or four specialists who pay you reliably every time you send them a job. That is a revenue stream.

Building Referral Revenue Into Your Business

If you are already sending work to other plumbers and specialists, you are already doing the hard part. The work is flowing. The relationships exist. The only piece missing is the financial arrangement that makes it worth your while to keep doing it consistently.

• Pick the one or two specialists you send the most work to and have the fee conversation this week.
• Agree on a structure (percentage or flat fee) and put it in writing, even if it is just a text message.
• Set clear payment timing so nobody has to guess or chase.
• Track your referrals so you know what you are owed and can follow up if a payment is late.

Referral fees are not a bonus. They are compensation for the value you bring to another professional’s business every time you hand them a customer. Treat it like the business practice it is, and the money follows. For more on building your reputation as the plumber other pros want to refer, read about building a referral reputation as a plumber.

If you want a simple way to set up referral fee agreements, track referred jobs, and get paid when they close, take a look at PureIntro for home services professionals.

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.