Gaithersburg Plumbing Inc
Plumber · Gaithersburg, MD
Our verdict
Polarized 3.5-star profile: 29 five-stars vs 23 one-stars across 52 analyzed reviews. Strong on water-main and water-line work (one reviewer paid roughly half the competing bids) but multiple AHS/insurance customers report being deprioritized, and several jobs were billed $250-$1,740 for what customers felt was mini...
Scores are our editorial reading of published customer reviews — not a verification, license check, or guarantee.
Our opinion, based on the 52 reviews we analyzed from Google, Yelp and BBB · Analysis updated May 2026 · How we decide ↗
What reviewers praise
Water-main and water-line replacements praised — one customer said the bid was 'almost half the price of the other two bids' and the job finished ahead of schedule
1 cited review
“Gaithersburg Plumbing did a fantastic job for me to repair a water main break and pulling a new line to the house.”
Cited in 3 of the 52 reviews we analyzed — 2 cited reviews not excerpted here.
Same-day water-heater install confirmed by one reviewer whose unit failed and was replaced the same day
Cited in 1 of the 52 reviews we analyzed.
What reviewers report — the concerns
Other directories bury these. We think you should read them before you call. Every concern below comes from the reviews it cites.
Red flag
23 one-star reviews out of 52 analyzed — review consistency is extremely low (0.013) and sentiment is 44% negative
“He came back gave an estimate of $333. This was for a service to replace one valve in a faucet. It took him literally two and a half to three minutes to fix the problem.”
1 more cited review
“if you are with ahs and you get alloted, you will be the last priority.”
Cited in 3 of the 52 reviews we analyzed — 1 cited review not excerpted here.
Red flag
One water-heater install reportedly placed the expansion tank just above the anode rod hole; company refused to fix it
Cited in 1 of the 52 reviews we analyzed.
Red flag
Multiple reports of opaque billing and unreturned office calls after the job
“Absolutely horrible communication and can't even get the office to call you back.”
Cited in 2 of the 52 reviews we analyzed.
AHS/home-warranty customers report being put last — one waited two weeks for a Friday appointment that was pushed to Monday
“if you are with ahs and you get alloted, you will be the last priority.”
1 more cited review
“Absolutely horrible communication and can't even get the office to call you back.”
Pricing complaints: $333 for a 2-3 minute valve swap and a $1,740 estimate to run a fridge waterline the customer DIY'd in 25 minutes with a $20 kit
“He came back gave an estimate of $333. This was for a service to replace one valve in a faucet. It took him literally two and a half to three minutes to fix the problem.”
Cited in 2 of the 52 reviews we analyzed.
Keep it in proportion: these concerns are cited in 5 of the 52 reviews we analyzed. Most reviewers report positive experiences — see the full rating picture below.
The evidence — in reviewers' own words
Critical
“The plumber installed a water heater and made the water expansion tank just above the anode rode hole. It is extremely wrong doing. I contracted them and they refused to fix the problem. Never call Gaithersburg Plumbing again. Very Bad service.”
“They came to my condo to do warranty work, they determined this wasn't a warranty job but they could fix it real quick anyway. After a half hour of work and zero understanding of any charge, I was given a bill of almost $300. Absolutely horrible communication and can't even get the office to call you back. Really shady people.”
“Our technician came in took 10 minutes to do the estimate. He came back gave an estimate of $333. This was for a service to replace one valve in a faucet. It took him literally two and a half to three minutes to fix the problem. Exorbitant and ridiculous price for such a service. I did complain and yeah I got 60 bucks back till cost $250. For literally two and a half minutes of work and maybe $10 for a part. I do …”
Positive
“Service was through AHS. One thing about AHS I didn't like was waiting almost 1 1/2 hours to talk with someone. The service from Gaithersburg Plumbing was great. Jason showed up quickly to replace a valve under our kitchen sink. He explained how the valve failed and how to winterize the valve; the valve was for our faucet which is outside. The service was quick and he was very professional. I hope I get service from …”
“Mr. Max and Mr. Chester was awesome. Courteous, friendly, and on time. They work so well together. Had me laughing and made my day. Customer service was excellent. I recommend these two to anybody looking for excellent quality service.”
Quotes are reproduced verbatim from public reviews on the platforms shown; we select which to feature, and selection reflects our editorial judgment. Report a quote that doesn't match its source ↗
The rating picture
Newest review in our sample: Feb 2026.
Should you hire Gaithersburg Plumbing Inc?
Hire if
- You need high-quality work that holds up over time
- You need fast same-day or after-hours response
Think twice if
- You need predictable, consistent service across every visit
- You want detailed upfront explanations
- You need rock-bottom prices with zero flexibility on the quote
- You need airtight scheduling and guaranteed arrival times
Look elsewhere if
- You're highly price-sensitive
- You need this for a complex or high-stakes install
Advice derived from the review analysis above — how we decide.
Own Gaithersburg Plumbing Inc?
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Find plumbers near you
Gaithersburg Plumbing Incisn't in one of our ranked city guides yet — the nearest covered markets are below.
Nearby: Ijamsville · Cooksville · Reston · Annapolis Junction