Editorial standards set by Stu Clark, a UK-trained plumber who ran his own plumbing and bathroom renovation business for 10 years before founding Top5HomePros.
A reliable plumber is licensed and insured in your state, gives you a written estimate before starting work, and has a real, verifiable track record of local reviews. Ask about licensing, insurance, warranty and pricing upfront. If a plumber dodges any of these questions, that alone is worth walking away over.
Why It Is Worth Slowing Down Before You Hire
A bad plumbing job does not just cost you the price of the callout. Get it wrong and you are looking at repeat visits, water damage, or a repair that has to be redone properly by someone else. Most of that risk gets sorted out in the five minutes before you hire, not after, by asking the right questions.
From the founder
"The biggest mistake I saw again and again, from actually being on the job, was people hiring the cheapest quote. It almost always came back to bite them. Either the standards just weren't there, or the plumber left the job once they realized there was no profit left in it for them, or they got hit with a stream of add-on work invoiced on top, until the final bill ended up higher than the more expensive quote would have been in the first place." says Stu Clark, who ran his own plumbing and bathroom renovation business for 10 years before founding Top5HomePros.
1. Are You Licensed, Bonded and Insured in This State?
Licensing requirements vary by state, but a genuine plumber will know their license number off the top of their head and will not hesitate to confirm it. Insurance covers damage to your home if something goes wrong. Being bonded is the third, often-overlooked piece: it means there is a financial backstop if the job is left unfinished or done badly, so you are not simply out of pocket while it gets sorted.
2. Can I See Recent, Verifiable Reviews?
Testimonials pasted on a plumber's own website are easy to write and impossible to check. A genuine Google Business Profile with a real review history, ideally with the company responding to reviews, tells you far more about how they actually treat customers. If you want references directly, ask for two or three from jobs completed in the last year, not their oldest, most polished ones.
3. Will You Give Me a Written Estimate First?
A reliable plumber quotes the job, in writing, before starting work, not after. Verbal-only pricing is one of the most common ways a small job turns into an unexpectedly large bill. For anything beyond the simplest fix, that quote should also come after they have actually seen the job, not just from a couple of photos. A rough figure from photos is a reasonable starting point, but a plumber who is upfront about it will flag it clearly as an estimate and leave room for issues that only show up once the work is underway, rather than presenting it as a final number.
4. What Happens If Something Goes Wrong?
Ask directly what their warranty covers and for how long. A plumber confident in their own work will have a clear, specific answer, not a vague "we stand behind our work."
5. Do You Charge a Flat Rate or by the Hour?
Neither is automatically better, but you want to know which one you are agreeing to, and what happens if the job takes longer than expected.
6. Who Actually Shows Up: You or a Subcontractor?
Some companies subcontract out jobs to whoever is available that day. There is nothing wrong with that if it is disclosed, but it is worth knowing so you understand who is accountable if the work is not right.
7. How Soon Can You Realistically Start?
Be wary of anyone who promises to start immediately on a non-emergency job. A busy, in-demand plumber usually has a short backlog. One who can drop everything for you might be short on other work for a reason.
Red Flags Worth Walking Away From
- Cash only, no invoice. A legitimate business can issue a written invoice.
- Pressure to decide on the spot. A genuine quote does not come with an artificial deadline.
- A quote far below everyone else's. It usually means corners get cut somewhere.
- No local address or service area you can find. A real local plumber is easy to place.
This is exactly the screening work we do before any plumber makes our Top 5 plumbers list in a town: checking for a genuine licensed identity, a real service area, and a review history that actually holds up. No business pays to be on that ranked list, so it reflects who is actually worth calling, not who spent the most on ads.