Expert plumbing solutions for homes and businesses across Londonderry, NH. Licensed, insured, and ready for emergencies 24/7.
From 24/7 emergency response to complete repiping, we handle every plumbing need for homes and businesses in Londonderry, NH.
Garbage disposal repair, replacement, and installation for kitchen sinks. We fix jammed, leaking, and failed units — or install new disposals with proper P-trap and dishwasher connections.
Emergency sump pump repair when flooding threatens your basement or crawl space. We diagnose failed floats, clogged intakes, and seized impellers fast — getting your pump back online before water damage spreads.
Tankless water heater installation for endless hot water without standby energy loss. We size, install, and commission all major tankless brands — and convert tank systems to more efficient tankless setups.
Gas leaks are a serious safety hazard. Our licensed plumbers use professional gas detection equipment to find leaks in supply lines, fittings, appliances, and meters — and recommend immediate repairs to protect your family.
When a plumbing crisis hits, you need a licensed plumber immediately. We answer emergency calls around the clock and dispatch crews fast — stopping leaks, restoring water service, and preventing further damage.
Skip the destructive dig. Our trenchless sewer repair methods rehabilitate damaged sewer lines from inside the existing pipe — preserving your landscaping and completing most jobs in a single day.
Clogged drains slow your life down. Our licensed plumbers clear kitchen drains, bathroom drains, main sewer lines, and floor drains using professional hydro-jetting equipment that cleans the entire pipe interior.
If your home suffers from frequent leaks, low pressure, or discolored water, repiping may be the solution. We replace your entire water supply system with modern pipe materials and restore full pressure and water quality.
Professional gas line repair performed by licensed plumbers who understand gas system safety. We find the leak, repair or replace the damaged section, and pressure test the line before restoring gas service.
Professional leak detection services that pinpoint hidden water leaks without tearing into walls or floors. We use non-invasive technology to find the source precisely, then recommend the most effective repair.
Professional grease trap cleaning for commercial kitchens of all sizes. Reliable schedules, full compliance paperwork, and a clean trap every time — keeping your operation running and inspection-ready.
Professional commercial plumbing services for all business types. From emergency repairs that keep your doors open to scheduled maintenance that prevents downtime, we protect your business operations.
Hydro jetting service using high-pressure water to scour the interior of your drain and sewer lines. Removes grease, scale, tree roots, and years of buildup that mechanical snaking cannot reach.
Boiler repair and installation for residential and commercial hydronic heating systems. We service gas, oil, and electric boilers for reliable winter heating — diagnosing pressure, circulation, and combustion issues.
Expert pipe repair for residential and commercial properties. We locate leaks and damage accurately, perform durable repairs, and pressure test the system to confirm everything holds before leaving.
Professional water line repair and replacement for main supply lines and service connections. We diagnose breaks, corrosion, and leaks, then perform durable repairs or full replacements using quality materials.
Sewer line repair and replacement for cracked, collapsed, root-infiltrated, and offset pipes. We use camera inspection to diagnose the problem and recommend spot repairs, pipe lining, or full replacement.
Expert water heater repair that restores your hot water fast. From faulty thermostats and pilot light issues to anode rod replacement and sediment flushing, we fix the problem at the source for lasting results.
Expert faucet repair and installation for dripping, leaking, and hard-to-turn faucets in kitchens, bathrooms, and utility areas. We repair or replace cartridges, O-rings, seats, and stems — or install new fixtures.
Expert slab leak detection and repair using electronic sensors and thermal imaging to pinpoint leaks under your foundation. We perform minimally invasive repairs to protect your structure and stop water waste.
When your water heater reaches the end of its life, we make replacement easy. Our plumbers handle everything — disconnection, removal, installation, and final testing — so you have reliable hot water again fast.
Professional sewer camera inspection to diagnose blockages, root intrusion, cracks, offsets, and collapse. We show you the video so you can see the problem and make informed decisions about repairs.
Backflow testing is required annually in many jurisdictions. We test your preventer, document the results, and submit paperwork to your local water authority — keeping you in compliance and your drinking water safe.
Reliable toilet repair and installation for running toilets, phantom flushes, rocking toilets, weak flushes, and leaking seals. We diagnose the root cause and repair or replace components quickly and affordably.
Protect your basement before the next storm. Our plumbers install sump pumps with float switches, check valves, and battery backup systems — ready to keep groundwater out of your home reliably.
Londonderry property owners know that New Hampshire weather and aging infrastructure can create plumbing problems at any time — frozen pipes in cold snaps, slab leaks from soil movement, or water heater failures with no warning. With 27,461 residents depending on reliable plumbing, Magnet Plumbing provides emergency services built to handle everything fast.
Rapid diagnosis, accurate repair, and a final pressure test are not optional in Londonderry — they are standard procedure on every Magnet Plumbing job. Our NH plumbers evaluate every situation with local conditions in mind, deploying the right tools and materials to achieve a lasting fix. That professional approach saves Londonderry homeowners time and money.
Here is what sets Magnet Plumbing apart from other plumbing companies in Londonderry.
Our plumbers live and work in the communities they serve. They understand local water quality, regional pipe standards, and the specific plumbing challenges common to your area — giving you faster, better solutions.
Every plumber we send carries a valid state license and full liability insurance. You get peace of mind knowing the work is done legally and that your property is protected if anything goes wrong.
We use thermal imaging cameras, electronic moisture meters, and acoustic listening devices to find hidden leaks behind walls, under slabs, and underground — without tearing into your property unnecessarily.
Every plumbing job starts with a free, no-obligation estimate. We inspect the problem, explain our findings in plain language, and give you a clear price before starting. No pressure, no surprises.
Plumbing emergencies do not wait for business hours and neither do we. Our emergency crews are on call around the clock — burst pipes, gas leaks, and flooding get a fast response any time you call.
Have questions about plumbing in Londonderry? We have answers.
Your main water shutoff valve in Londonderry is typically located near the water meter, near the front foundation, or in the basement or utility room. Turn the valve clockwise to close it. If you cannot find your shutoff or it is stuck, call Magnet Plumbing immediately — our emergency crew can help locate and operate the valve to stop water damage.
Plumber rates in Londonderry typically range from $100 to $250 per hour depending on the type of work and time of day. Common jobs like drain cleaning run $150 to $300, while slab leak repair and repiping projects cost significantly more. Magnet Plumbing provides free estimates so you know the full cost before any work begins.
To prevent frozen pipes in Londonderry, insulate exposed pipes in unheated areas like garages, crawl spaces, and attics. Keep cabinet doors under sinks open during cold snaps. Let faucets drip slightly during freezing temperatures. If a pipe does freeze, call Magnet Plumbing immediately rather than attempting to thaw it yourself to avoid a burst.
Low water pressure in Londonderry homes is often caused by mineral deposits clogging aerators and pipes, a partially closed shutoff valve, a failing pressure regulator, or a hidden water line leak. Corroded or deteriorated pipes in older Londonderry properties can also restrict flow significantly. A licensed plumber can diagnose the specific cause and recommend the right fix.
When hiring a plumber in Londonderry, always verify their NH license and insurance. A licensed plumber must pass state examinations and carry liability coverage that protects your property. Magnet Plumbing employs licensed, background-checked plumbers throughout New Hampshire — call (844) 618-0753 to schedule service or get a free estimate.
Signs of a slab leak in Londonderry homes include unexplained increases in your water bill, warm or wet spots on the floor, the sound of running water when all fixtures are off, cracks in the foundation or walls, and low water pressure. If you notice these symptoms, call a plumber for professional slab leak detection before the damage worsens.
Our reputation is built on results. Here is what our customers say.
"Replaced two old toilets with new comfort-height models. The installer was respectful, took his shoes off at the door, and hauled away the old toilets. Small things that make a big difference."
"Saul and crew are the best. Replaced our water heater, re-piped, and gassed up our kitchen and laundry room. Honest, fair, efficient, and went above and beyond. I could not have asked for a better experience. Highly recommend. Thank you!"
"Magnet Plumbing handles all the plumbing for our restaurant. Reliable, always on time, and they understand commercial urgency."
Magnet Plumbing proudly serves homeowners in these cities near Londonderry.