Reviewed by AJ Robles Owner & Licensed Master Plumber · LIC# RMP 46529 Updated June 25, 2026 Plumbing is one of those trades where the gap between a great experience and a frustrating one comes down to who you hire. A lot of Houston homeowners have a story about a scary, upsell-heavy estimate or a job that didn't hold. Here are five things to check before you say yes — and the questions that separate a straight-shooting plumber from a sales pitch.
1. Check the license
In Texas, plumbers are licensed by the Texas State Board of Plumbing Examiners. For a company, the credential that matters is the Responsible Master Plumber (RMP) number — it's what lets a business legally pull permits and stand behind the work. Ask for it. (Mahi Plumbing is owner-operated by a licensed Master Plumber, RMP 46529.) If a job needs a permit, a licensed plumber pulls it — see our plumbing permits guide.
2. Insist on upfront pricing
You should know the price before the work starts — in writing, as a flat rate for the job, not an open-ended hourly meter. A clear quote means no surprise line items at the end. If the scope changes mid-job, a good plumber re-quotes and gets your okay before continuing.
3. Get a second opinion on big estimates
For any large recommendation — a whole-home repipe, a sewer replacement, a full water-heater swap — a second opinion is smart, and a reputable plumber welcomes it. Ask another licensed plumber to inspect the same problem and compare the written scope before you commit. Not sure a recommendation adds up? Our guides on repair vs. replace and slab leaks can help you sanity-check it.
4. Ask who actually does the work
With many large outfits you get a different, commissioned technician every visit — which can mean inconsistent work and pressure to upsell. With an owner-operator, the licensed Master Plumber who quotes your job is the same person who does it. That's accountability you can't fake.
5. Read the reviews — and what they say
Star ratings are a start, but read the words. Look for repeated themes: honesty, clear explanations, showing up on time, fair pricing, and cleaning up. You can read what Houston-area neighbors say about us on our reviews page.
Red flags to watch for
- No license number, or hesitation to share one.
- Pressure to decide "right now" on a big repair.
- A quote that jumps to the most expensive option before the problem is even diagnosed.
- Vague pricing, or "we'll see how it goes" instead of an upfront number.
- Different tech, different story, every visit.
The bottom line
Hire the licensed plumber who quotes you straight, prices it upfront, and isn't afraid of a second opinion. If that's the kind of plumber you're looking for in Greater Houston, that's exactly how we work — give us a call or schedule a visit.
Frequently Asked Questions
What license should a plumber in Texas have? +
Texas plumbers are licensed by the Texas State Board of Plumbing Examiners. For a company, look for a Responsible Master Plumber (RMP) number — that's the credential that lets a business legally pull permits and stand behind the work. Mahi Plumbing is owner-operated by a licensed Master Plumber, RMP 46529.
Should I get a second opinion on a plumbing quote? +
Absolutely — especially for big-ticket recommendations like a repipe, sewer replacement, or full water-heater swap. A trustworthy plumber will not be offended. Ask another licensed plumber to inspect the same problem and compare the written scope before you commit.
Why does it matter if the same plumber does the work? +
With many large companies you get a different, commissioned technician every visit, which can mean inconsistent work and pressure to upsell. With an owner-operator, the licensed Master Plumber who quotes the job is the one who does it — so you get accountability and a straight answer, every time.