TNT Home Services
“I had Erick Buchlotz doing some plumbing job at my house and I was very impressed with his ability to get the job done professionally, very nice individual.”
Best Plumbers in Longmont, CO
24 contractors listed · 17 in Longmont · 7 open 24/7 · 10 open weekends · 23 rated 4.5+
Data verified October 28, 2026
Colorado's Finest Heating and Air Conditioning
“I had a blower go out on my furnace and called more than a dozen companies just to find a company willing to give me an estimate over the phone after one company came out and gave a wildly overpriced quote.”
Groulx Mechanical Heating & Cooling Inc.
“Mark came out to take a look at our A/C unit in our new home and he was really knowledgeable and patient in his explanation of our issues and how we should fix them!”
Service Experts Heating & Air Conditioning
“Recently had my yearly advantage service check done by Rich, Clem, Matt and Leo on my Furnace, heat pump, steam humidifier, tankless water heater and my halo 5 water filtration.”
M and M Heating
“He knows what he's talking about and is concise in what the issues may be with our AC system and offers solutions to these issues in a way that is easy to understand.”
Colorado Green Plumbing
“Pricing was competitive, they were able to replace our furnace quickly in the middle of a big cold snap and they left our basement cleaner than when they got there!”
Listed for homeowners in and around Longmont, CO, these 24 companies cover plumbing work. Hours, license claims and free estimate offers come from each company's own website, so confirm them on the phone before you agree to a visit for something already running.
Area overview: Longmont, CO
Of the 24 contractors we list here, 17 are in Longmont itself and 7 come from towns including Berthoud (2, 10 mi), Boulder (2, 13 mi) and Milliken (1, 8 mi). The contractors on this page are rated from 4.0 to 5.0 across 8,166 reviews; 16 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (87%), responsiveness (85%) and quality (79%). 7 are open around the clock and 10 are open on weekends. The services the contractors on this page list most often on their websites are water heaters (4), heating (3), plumbing (3), air conditioning (2) and indoor air quality (2). 11 show a license on their websites; 2 list staff certifications (NATE) and 7 have a BBB rating of A or A+. 10 have ten or more years of experience, the longest 66 years. 9 offer emergency call-outs; 8 offer financing or payment plans; 8 give free estimates; 8 are family- or locally-owned and 9 list coupons or special offers. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
Which plumbers listed for Longmont take calls at night?
Cover at any hour is claimed by 7 of the 24 plumbing listings here. Before paying a night rate, shut off the main and see whether the trouble stops. If it does, a morning appointment buys you the same repair for less. Confirm the after-hours rate on the phone.
Bliss Water Heater & Boiler Repair Service
“I highly recommend, I was able to define the scope of work and arrange an appointment via a quick 2 minute phone call and follow up with the details via text.”
Longmont Water Heaters
“He diagnosed the issue better than previous service calls I'd made elsewhere, and he was willing and happy to teach me the clean-out process to enable me to work on it in the future.”
Everest Mechanical
“Short of rewinding time, Everest Mechanical did EVERYTHING in their power to make it right, including giving us a maintenance package to guarantee the quality of their work for the next couple years.”
Drain Solvers the Pros
“It took just 20 minutes and the right tools to breakdown a complete blockage 30ft down line, then flush it away; for half the price of the franchise plumbers.”
Planet Plumbing & Drain
“Saul came by to fix an issue with our washing machine, and was not only super helpful and able to fix the issue with no problem, but also a pleasure to chat to!”
Maddison Mechanical
“I seriously cannot thank them and the company enough for going above and beyond… issues like these are often frustrating to deal with but my experience with them have been nothing short of amazing.”
Longmont Plumbing Services
“Very good attention to details Along with fixing our problem, the plumber Astel took the time to look at other possible problems and offered insightful advice for next upkeep.”
Beck Sales Inc
“They will find any valve, fitting, pipe, bar, etc in any material.”
287 Plumbing Llc
“He came to our house at 6:00pm on a Friday night to replace our water heater when it died so we wouldn't have to be without hot water over the long weekend.”
ABC Drain & Sewer Cleaning
“Clayton (and his father before him) have kept my house pipes root free and kept my sinks and plumbing working wonderfully for decades.”
Rice Plumbing
“His attention to detail & communication were key to a success project.”
Mighty Plumbing and Heating LLC
“Faucets were installed but the plumber bent the kitchen sink and I had to call a different company to come out and stabilize the kitchen sink in addition to the fixing the bathroom faucet drain that was overly tightened and damaged during install .”
Bernie's Plumbing & Heating Company
“I had one younger plumber from Bernie's not pursue a water pressure problem and after prompting him to consider that option indeed the valve was broken.”
A&E Comfort Pros
“Efrien and his coworker Jason come out and do the maintenance service on my furnace every 6 months and replaced my air filter they also did an amazing job with the installation of my new A/C system.”
Save Home Heat
“First, they did a phenomenal job at walking me through the process of installing a mini split HVAC system in my home, and then more recently they gave a thorough inspection of my old water heater.”
Good Guys Home Services
“I live in Idaho though, so when the shower stopped working, I called Jake and the team to come out and get the water flowing again (college kids need showers).”
Jones Excavating & Plumbing
“I hired them to replace a main water line on our farm (300+ ft run), and they were competitively priced, and most importantly worked around a complex schedule on our end, and got it done.”
Mayer Plumbing
“In every case they've been professional and efficient, they've clearly explained things, and they've obviously looked for the best solution to make sure the problem doesn't come back.”
Why these companies made our list
What customers say about contractors in Longmont
- “Tony was very professional and friendly. He explained everything throughly and spelled out our options so we could make the best decision for our circumstances.” — customer of Everest Mechanical
- “Mike did a fantastic job. He was very responsive, performed all work as required, and the installation of two new hot water heaters was neat and tidy.” — customer of Longmont Water Heaters
- “Thank you for being incredibly responsive and taking care of our tenants within 20 hours from first call to full water heater install.” — customer of Bliss Water Heater & Boiler Repair Service
- “I will continue to call 287 Plumbing first for any plumbing needs, high quality work for a fair price.” — customer of 287 Plumbing Llc
- “Adam was attentive and efficient. They had great customer service and I will be using them again in the future.” — customer of Colorado Green Plumbing
Excerpts from public reviews of the contractors listed on this page.
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