The Texas plumbing company is you plus one insurance certificate

Go looking for the Texas plumbing contractor license and you will not find one, because there is nothing to find. No company credential, no corporate registration with the plumbing board, no entity number a shop can buy and hang on the wall.

What Texas issues instead is three letters after a person's name. RMP, Responsible Master Plumber, is the designation that lets plumbing work be contracted directly with the public, and the Texas State Board of Plumbing Examiners attaches it to a human being rather than to a business. It attaches to you, and it stays attached when you change your mind about who you work for.

If you hold a master plumber license in good standing, you are one insurance certificate away from holding it. That is the gate in full. What follows is what the certificate has to say, what changing companies actually looks like in the board's system, and the nine things that have to exist before you can send a plumbing invoice in your own name.

The gate is one certificate, and Occupations Code 1301.552 writes it

There is no second exam. The board's Responsible Master Plumber requirements are a current master license and proof that you are insured.

Read the timing row as a sequence rather than a rule. Bind the policy, get the certificate to the board, then quote. That order is convenient, because the certificate of insurance is also the first document a general contractor asks a plumbing subcontractor for, and the second is a W-9. Buy the policy once and you have satisfied the state and the GC's compliance desk on the same afternoon.

$300,000 for all claims in a one-year period is the floor, not the market. Commercial work asks for more, and San Antonio already asks a registered Home Improvement Contractor for $300,000 per occurrence, $600,000 aggregate and $300,000 products and completed operations, with the City named as certificate holder. Ask your broker to price the higher limit alongside the floor while you are buying, because raising a limit mid-year means a fresh certificate to every party holding the old one.

Three details decide whether a certificate lands first time. The named insured matches your legal entity word for word. The additional insured endorsement is attached rather than promised. The expiry sits past the end of the job. Getting all three right on the first send is certificates of insurance for Texas contractors.

Where the RMP sits, and why it is the rung that changes your income

Every rung below it is about what you may touch. This one is about who may sign.

Eight thousand hours under a licensed plumber and two years carrying the journeyman card stand behind the fourth row. The fifth row is a phone call to a broker.

The fourth row is also shorter than its reputation. The board's current master examination application, revised January 2026, asks for no supervisory hours at all, which puts the calendar rather than a logbook between journeyman and master, and an out-of-state journeyman license held four years qualifies you directly. That route is the Texas master plumber license.

The designation is yours, and it walks when you walk

Here is the structural fact worth reading twice. Because Texas issues no company credential, a plumbing business's right to contract with the public rests on the RMP of record standing behind it, and that person may act as the RMP of record for only one company at a time.

Three things follow, and they all favor you.

Your employer is not holding a license you would have to buy back. The credential is registered to your name. There is no company asset to negotiate over and no waiting period to serve.

Going out on your own is a change of company, not a new application. You file the change in the board's Online Licensing System, attach the certificate of insurance for your entity, and the designation moves with you.

One at a time makes you scarce. A shop that wants to keep contracting needs an RMP of record on the day yours resigns. That is worth saying out loud at a review, and it is why the last month of a master plumber's notice period is the month the money conversation goes differently.

What it costs to stand your own shop up

Order matters, because a general contractor asks for a certificate of insurance, a federal tax ID and an entity name that matches your bank account, and none of those can exist before the first filing does.

Cash out of the door before the premium and the board's designation fee: about $333 registered in Austin, about $453 in Dallas. For a trade that took you six years of hours to qualify in, that is the entire barrier to entry.

Two of those rows carry more weight than their price suggests.

The city decides whether you pull the permit. Texas leaves general contracting unlicensed at state level, which puts the city registration desk in charge of who pulls permits, and for plumbing the city wants your state license on file behind the registration.

Registration is per city rather than per job, and in most of them it is an annual line in your overhead instead of a cost carried by one project. Which portal wants what is Texas city contractor registration.

The sales tax permit decides your invoice. For a plumber the split that matters is residential against nonresidential. Labor to repair or remodel a family dwelling is not taxable. The same labor on an office, a restaurant or a warehouse is a taxable service, and you collect tax on the total charge for the job. New construction labor is untaxed on both sides of that line. Write a separated contract, with the fixtures and the labor as two stated amounts, and the permit lets you buy the water heater on a resale certificate rather than paying tax at the counter and burying it in your cost. Which side of the line each job falls on is Texas sales tax for contractors.

One more decision belongs on day one. Texas is the only state that lets a private employer elect not to carry workers' compensation, and an employer that goes without files DWC Form-005 with the Division of Workers' Compensation each year between 1 February and 30 April, within 30 days of hiring a first employee, within 10 days of dropping coverage, within 10 days of a request from the Division, and posts the no-coverage notice in English and Spanish. It is a real choice with real arithmetic on both sides, and workers' comp is optional in Texas runs that arithmetic before the first hire rather than after it.

Price plumbing work like a shop, not like a wage

The RMP costs you an annual renewal. The number that decides whether you keep it is your hourly rate, and the trap in a first year is pricing off the wage somebody else used to pay you.

Your old rate covered your hands. Your new rate covers the truck, the fuel, the premium, the license and designation renewals, the continuing education, the truck stock sitting in bins you have already paid for, the machines, the phone, the accounting, and the hours you spend quoting and driving that no customer pays for.

Put fixed costs for the year at $48,000 and honest billable hours at 1,300 out of a 2,080 hour year. That is $37 an hour of overhead before you have paid yourself. Add your own pay at $45 and break-even is $82. A rate of $126 to $137 is what a 35 to 40 percent margin looks like on those inputs, not greed. Change one number, say billable hours fall to 1,100 because you are quoting more, and overhead jumps to $44. That is the figure worth recalculating each quarter.

Four moves make the rate hold in front of a customer.

Charge a trip and a stated minimum. A service call with 40 minutes of work in it has already spent an hour of truck time. A minimum quoted the same way on every call ends the argument before it starts.

Flat rate the repeatable work. Water heater swap, disposal, hose bib, toilet reset, main shut-off replacement. Price each once, quote it in a sentence, and stop being punished by your own hourly honesty every time you get faster.

Mark the fixtures, and let the contract show it. You are financing them, warrantying them and driving the faulty one back. A separated contract makes the material line visible, which turns the markup into a line item rather than a secret.

Price the callback in. A warranty return on a $300 repair burns the same hour as a paid one. A few percent across the book covers it, and it stops a bad week from eating a good month.

Texas hands you three collection tools, and residential work needs the first one first

Texas protects plumbing money with dates, and Chapter 53 counts most of them in month buckets rather than in days. Everything you furnish in March shares one deadline, which makes the whole calendar fit on one screen.

The trigger month in row four depends on which chair you are in. An original contractor counts from the month the original contract completed, terminated or was abandoned. A subcontractor counts from the last month it furnished anything.

The homestead contract has to exist before the first fitting. Under Tex. Prop. Code s.53.254 an original contractor improving a homestead needs a written contract executed before any labor or material is furnished, signed by both spouses if the owner is married, and filed with the county clerk of the county where the homestead sits. Do that and a $14,000 repipe is a secured debt. The lien cannot be created after work has started, so this is the one piece of paper on the page that is worth stopping a truck for.

Thirty-five days, and interest after that. On private work an owner who receives your written payment request has 35 days to pay under Tex. Prop. Code s.28.002. Overdue amounts run at 1.5 percent per month under s.28.004, the terms are not waivable in the subcontract, and the statute gives you a right to suspend work once you have given notice. When money reaches you that covers a lower tier's work, their share goes down within 7 days.

Ten percent is already reserved with your name on it. Under s.53.101 the owner reserves 10 percent of the contract price during the work and for 30 days after completion. Where your contract provides for retainage, the notice of claim under s.53.057 goes out within 30 days of your contract completing or the original contract ending, whichever comes first. Claiming that money is a notice, not a negotiation.

Working as a sub rather than the original contractor adds the tool with the most force in it. For each month you furnish labor or materials, a notice to the owner and the original contractor by the 15th day of the third month after that month on commercial work, or the second month on residential, under s.53.056, authorizes the owner to hold back what it takes to pay your claim. The notice carries statutory warning text the owner has to read. Ask for the money under s.53.083 and the original contractor has 30 days to dispute your claim or is deemed to have agreed to it, at which point the owner pays you out of the withheld funds. Under s.53.084 an owner who pays the contractor anyway is on the hook for that money personally. Sent on time, every month, one page turns a slow payer into somebody whose own money is at risk.

Those are 15ths counted across month boundaries on the day you are least in the mood for arithmetic. The Texas lien deadline calculator takes the months you actually worked and counts them, and the notice itself is the Texas monthly notice.

Three endorsements that widen what you can quote

The board lists three endorsements a master plumber can add: medical gas, multipurpose residential fire protection, and water supply protection specialist.

Each one is a market rather than a certificate. Medical gas piping puts you in hospital, surgical suite and dental fit-outs, where the bid list is short because the endorsement is short. Multipurpose residential fire protection covers sprinkler systems fed off the domestic supply, which is what a builder in a sprinkler jurisdiction has to buy from somebody holding it. Water supply protection is backflow assembly testing, and backflow testing is annual, scheduled, and paid for by property managers who would rather have one plumber on a calendar than five on speed dial. That is recurring revenue in a trade that otherwise sells one-off emergencies.

Add one before you need it. An endorsement earned in a quiet month is a bid list you are already on when the quiet month ends.

The renewal is a morning a year

TSBPE runs the whole ladder on an annual clock. Apprentice registration, tradesman, journeyman and master all renew yearly, and the licensed tiers carry 6 hours of continuing education. The RMP designation renews with your master license.

The date that quietly matters is the insurance expiry, because the designation rests on a certificate that has to stay on file with the board. Put the policy renewal 30 days ahead of the board renewal in the same calendar and the two can be handled together.

Three dates and the administrative year is finished: your TSBPE renewal, the policy expiry, and 15 May for the franchise tax report with its Public Information Report. Add the 1 February to 30 April window for DWC Form-005 if you hire and elect to go without workers' compensation, and that is the whole year of state paperwork for a plumbing company.

What it costs to run on AEC Stack

Your license, the certificate of insurance, the city registrations, your flat-rate book, your quotes and your invoices sit in one place. There is no monthly subscription. AEC Stack takes 2.5 percent of each invoice processed through the platform, collected on the payment due date, so the software gets paid after you do.

If the master license is already in your wallet, this is a week. Call your broker on Monday, file the Certificate of Formation while the quote comes back, and get the certificate to the board before you take the first job in your own name. Start your business walks the filings in order, and the Texas plumbing work already coming up is on find work.