Black Diamond Plumbing & Mechanical Inc.
Plumber · Woodstock, IL · Open 24 hours per Google listing
Our verdict
4.9-star BBB A+ accredited multi-trade (6,632 reviews); workmanship theme in 22 of 81 analyzed reviews and midnight emergency dispatch confirmed, but 2 reviewers cite higher-than-expected pricing.
Scores are our editorial reading of published customer reviews — not a verification, license check, or guarantee.
Ranked #5 of 15 plumbers we've reviewed in Algonquin, IL · compare all →
Our opinion, based on the 81 reviews we analyzed from Google, Yelp and BBB · Analysis updated Jun 2026 · How we decide ↗
Lists 24-hour service on its Google profile — and reviewers describe after-hours calls.
What reviewers praise
Midnight emergency call answered and technician on-site first thing in the morning at a cost reviewers describe as very reasonable.
1 cited review
“We called them in the middle of the night and they had somebody here first thing in the morning. It was fixed and at a very reasonable cost. You would definitely recommend this company”
Loyal customers cite consistent technicians and no staff turnover over multiple years — same techs returning for repeat service across furnace, A/C, disposal, and water heater work.
1 cited review
“I always get several quotes for big repairs and Black Diamond is always the best!! They are worth every penny. Honest up front pricing, no surprises, service windows are convenient, always on time, no employee turnover.”
Methodical technician approach praised: Mario resolved kitchen drain issue to best of abilities; Zach identified well-water contamination root cause and fixed it proactively.
Cited in 2 of the 81 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.
Pricing runs high for some jobs: water heater replacement described as 'a little more expensive than we wanted' (T67wSj1SQsT5kdte4Huz) — expensive theme flagged in 2 of 81 analyzed reviews.
“We had a water heater replaced. It was a little more expensive than we wanted, but everything is right now. Mike did a good job. Knew what he was doing and I learned a couple of things.”
Keep it in proportion: these concerns are cited in 1 of the 81 reviews we analyzed. Most reviewers report positive experiences — see the full rating picture below.
The evidence — in reviewers' own words
Critical
“Two years in a row, Black Diamond tells me I have a leak in my AC. In 2025, they told me the leak was fixed and system recharged. Come to find out during my 2026 annual tuneup that there’s a leak that needs to be fixed and the system will need to be recharged again. They’re trying to tell me that they never fixed the leak in 2025. Why would they recharge it and not fix the leak?? That just doesn’t make any …”
“Tommy is great, very professional. I am a long time customer and I will continue to use Black Diamond.”
“Signed up for a 3-year membership/maintenance plan a month ago. That same day, I signed up for the “Annual Furnace + AC Tuneup” included in that membership. I was provided the date and a 4-hour window from noon to 4pm. I cleared my calendar to accommodate that 4-hour window. Fast forward to today for what was supposed to be my appointment and I still hadn’t received a call or text by 3:52pm. I called Black Diamond …”
Positive
“I called Black diamond,about having my kitchen drain cleaned. Mario,was the plumbing technician who arrived on time. He looked over the situation,and got to work. He took great care in making sure my issue was resolved to the best of his abilities. I would highly recommend Black diamond,if all of their employees are as committed to excellent work,this is a company worth having a positive experience with.”
“Life savers! And I’m not even a customer. Well, I am now. I had a flat and without hesitation a representative from Black Diamond pulled over and hopped out with a battery operated compressor to help. It ended up being a pretty bad gash in the sidewall and wasn’t holding air. So he went back to the truck and got some rubber cement to help hold the air so I could get to a safer spot to change the tire. It was a busy …”
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: Mar 2026.
Across platforms
Should you hire Black Diamond Plumbing & Mechanical Inc.?
Best for
- Emergency and same-day calls
Hire if
- You need high-quality work that holds up over time
- You need a plumber who actually shows up when scheduled
Think twice if
- You need rock-bottom prices with zero flexibility on the quote
- You need detailed walkthroughs and written estimates before work starts
Advice derived from the review analysis above — how we decide.
Own Black Diamond Plumbing & Mechanical Inc.?
You can respond to our analysis, correct business facts, or dispute the accuracy of a quoted review. Responses that check out get published on this page, and factual errors get corrected — see our corrections policy. We don't remove accurate quotes, but we'll re-run your assessment as your reviews change.
More plumbers in Algonquin, IL
A Right Price Plumbing & Sewer Company Inc.HIRERanked #4 of 15 in Algonquin · 5.0 stars across 97 reviews (95 five-star, 0 two-star or three-star); fast_response in 20 …S and J Plumbing & SewerHIRERanked #6 of 15 in Algonquin · 4.9★ across 4,190 reviews with 98% positive sentiment; fast_response cited 14 times and wo…See all 15 plumbers we've reviewed in Algonquin, IL →
Nearby: Algonquin · Marengo · Harvard · Libertyville