Joe got me a reasonable quote quickly. Came on a Saturday. That was appreciated since this job was…read morebecoming in blocker in the overall project. Joe installed a long gas line to supply a grill and a sunroom's gas fireplace. There were no issues and the work is complete.

Great communication skills, made an appointment in a timely manner, and accomplish the task he was…read morehired to do at the price he quoted.

I had an issue with our sediment filter. Located hanging from the ceiling. Difficult for me to…read moreclimb a ladder and get it opened to change the cartridge. John came and got it moved down to 5 feet above the ground. Took less than an hour with all the proper shutoffs. Extremely reasonable price also. Highly recommend them!!

We had a small issue John Came to the store and helped us out. He was very knowledgeable and…read moreunderstanding. As we explained the issue, he right away knew what the problem was and resolved it quickly and in timely manner. I would highly recommend if you needed any plumbing work done call Mainline. They were the best value for the money we spent and was worth having them to help us out.

Five stars to this company they saved our lives today had to call at 7am this morning with a backed…read moreup sink got a return call 15 minutes later with the time they were able to fit us in. When they arrived they diagnosed and fixed the issue quickly and thoroughly! Knock on wood we don't have another issue where we have to use them but if we did they'll be the first plumbing company we use! Thanks Londonderry Plumbing and Heating! Update 12/28 still would give a five star rating our hot water heater started leaking today gave them a call they were there to fix it right away great reliable company!

Rougly June of 2025 the came out to fix 2 6 - 7 inch pipes for my well to the well tank. $600.00…read moreand it still leaked then cane back and fixed 1 of the pipes and left. It still leaked called and said he'd come back that day and never showed up.

I have been using Southern NH for years. They are always so reliable and honest. I made the mistake…read moreof going with someone else when I was in a bind a year ago. I have regretted it every day. Southern NH came through for us and they were so accommodating. Great value and so friendly!

They gave a quick and reasonable quote, was prompt with their scheduling. Showed up on time and did…read morean excellent job. I converted from an oil boiler to a gas combi unit. They did not pressure me in any way just gave me all the options and answered any questions I had. The owner did the on site estimate and even showed up on day 1 to see if we had any questions. Steve and Shane handled the install and were prompt, responsible and knowledgeable. Highly recommend their service.

Work was done efficiently. Costed $650 for 20 minutes work and $75 in parts ( I looked it up )…read more This included the time to look at the job , quote it , do the work and pack the truck. It worked out to $800 an hour labor which was really a DIY job if you had the tools ( I didn't ) You get charged $99 for the quote if you don't have them do the work. I'm not sure if all plumbers have become this expensive but I'm sure willing to try someone else next time

4 adults and one infant living in a house with temp heat and hot water. We have been in this…read moresituation for close to 7 days. Can't shower or wash clothes.Cant wait to see electric bill They claim that they can't get part to repair this is I pay 180 $ a year to get preferred service. I just find this wait unacceptable what happened to overnite or next day service? Tell me where the part is and I'll go pick it up!!! I am not a happy customer

A friend of mine in Nashua New Hampshire wanted a whole house water filter put in, a toilet fixed…read moreand a leaky faucet fixed. I offered to research on Yelp to find a good plumber. The first call I made was to them. The customer service was off the charts amazing! Along with the follow through and expert service! They left everything pristine clean after and the prices were very reasonable. This company puts customers first! You can thank me later after you use them!

Excellent; ready and willing to get me on the calendar. I was able to get HVAC fixed prior to…read moreappointment, so I did not need their service.

We had water in our basement and trouble with the toilets so figured it was a clog. Called on a…read moreSaturday morning just before a major snow storm, so very anxious to get it fixed and not heard back from a couple phone calls to another number. So glad they were the ones to get back in touch! Kaiden was on it immediately, found the clog, took care of it and we were back in business in less than an hour. We could not recommend this business highly enough!

Had to have the pump in my basement bathroom pump-up tank replaced. While the job was eventually…read moredone, there were a number of problems. First, the tech misquoted the pricing (three times) on his way in - by several hundred dollars. I found this out being handed the bill on his way out the door - 'I made a mistake'. When taking the tank apart, broke most of the PVC connecting to the septic tank. It was all replaced, so I guess I got some of my money's worth, but they were unable, for some reason, to remove one of the tank cover bolts, so they just spun the cover around on that one bolt. We won't know until warm weather if they were successful in properly sealing everything back down. The entire area around the tank (my utility room) ended up literally soaked in septic tank water. The removed pump was deposited in the middle of the floor. (At one point, they wanted to walk a bucket of vaccumed up septic water through the house to dump it in my upstairs toilet.) There was no care taken to protect carpet in the process of removing any of the old (septic) materials out of the basement. There was no effort made to dry or disinfect the utility room at all. The second reason for the call was a clogged sink drain upstairs. We provided access to the cleanout downstairs. When the pipe was finally snaked, the resulting black clog coming out of the cleanout missed a waiting trashbag, and was deposited on the carpet, splattered in a living area. There was no protection used on the floor at all. The tech said, 'I sprayed cleaner on it, it will dry with no stain'. It took me personally two hours plus of cleanup work to remove the mess they left. I also spent another hour or so disinfecting the utility room. With their own photographs for evidence, I still had to make a number of calls to get the attention of their office manager, who finally agreed to a small refund to cover my time. This ended up as a bill of around $2000. Although the work was 'performed', apparently the concept of customer service has been abandoned in our current culture. I couldn't help feeling like they thought I should have had no complaints. I had a bunch, and frankly the $250 compensation off the final bill was still insulting. Overall, a horrific experience - I would not recommend this company to anyone, for anything, thanks.

Gardner and team did a great job replacing a water heater for us on short notice. Was able to get…read moreus hot water again on one days notice. They also replaced a shower faucet at the same time. Can't say enough good things about Johnson Plumbing. Quoted price was below the 3 others and job was done in about 3 hours. Super happy.

About 8 months ago I had another company come and replace a ring on a toilet, because I thought it…read morewas causing a stain on the ceiling beneath it. They had to come back because they didn't put the back piece of the toilet on correctly, it was rocking.They had to come back a third time because now there was a constant smell. They caulked around the toilet. For the next 7 months the smell would come back, sometimes a little, sometimes unbearable. BUT then I started getting little sewer flies. I was not calling them. I found Gardner Johnson on Yelp. It was a blessing. He listened. He looked. He fixed. The previous company had not set the ring correctly, and there was sewage literally sitting under my toilet. Anything you need plumbing wise, you would be wise to pick Johnson Plumbing. He also sent his assistant to help with another issue with my septic system. The assistant saved me at least a thousand dollars from a previous professional telling me what I needed to do. He showed me pictures proving it did not need to be done. They both were so professional, so great and they guarantee their work. But I am sure you will never .ever . have them come back for the same reason.

Daigle Plumbing and Heating promised a full refund in the amount of $231.80 to me on 2/3/26 for the…read morecharge of the service call that did not fix the problem with my furnace. As of today, 2/17/26 I have not received the refund. I have reached out to Kaylee as to the status of the refund and have been told that the check has been cut and in the mail. I should have offered to go and pick the check up as Daigle Plumbing and Heating is less than 1 mile from where I reside. My next step is to contact the Consumer Protection Division of the State of New Hampshire and hopefully they will get involved.

We had Daigle install bathroom plumbing and fixtures. A couple of snafuus came about (no fault of…read moreDaigle) but they were very professional and fixed the problems created in the design. Very pleased with the customer service and the transparency. I must say, Jason, the project mgr was amazing and very responsive. I would definitely hire them again- already thinking of an upstairs bath remodel. Stay tuned