Should a plumber be licensed and certified to install gas lines?

<div>Yes, most states require a plumber to be licensed, and for good reason. Hiring an unlicensed plumber could lead to poor quality work, costly future expenses, and potential code violations. Check our <a href="https://www.angi.com/angi-license-check.htm">state licensing tool</a> to review the local plumber guidelines.As you browse our pro listings, take note of the “Angi Approved” badge. Angi Approved businesses meet our standards for certification, which include:<ul><li>The owner, principal, or relevant manager passed a criminal background check</li><li>Required to have applicable state and local licenses</li><li>Maintain an average star rating of 3.0 or better on our network, if they have at least one review</li><li>Paying to advertise their services</li><li>Meeting any other eligibility criteria required by Angi</li></ul>Keep in mind licensing is different from certifications. A license is a legal requirement to operate a business, while certifications are voluntary.</div>

What are common gas line repair costs?

<div>The cost of repairing a gas leak depends on the type of leak, its severity, and how difficult it is for the repair technician to reach it. Some of the most common gas line repair costs, on average, include:<ul><li>Cap a gas line: $75–$150</li><li>Gas system inspection: $150</li><li>Pressure test: $75–$500</li><li>Damaged or corroded pipe: $6–$7 per linear foot</li><li>Repair gas leak: $120–$5,000</li></ul></div>

Get matched with top gas leak repair technicians in Baltimore, MD

There are 32 highly-rated local gas leak repair technicians.

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Verified Reviews for Gas Leak Repair pros in Baltimore, MD

*The Angi rating for Gas Leak Repair companies in Baltimore, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Gas Leak Repair needs.

*The HomeAdvisor rating for Gas Leak Repair companies in Baltimore, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Gas Leak Repair needs.

Last update on August 15, 2025

Reviewed in November 2024
The service tech came to my home and did an assessment of the issue. Found the leak in the gas line, showed me where it was leaking. He told me what needed to be to fix the leak, gave me a quote, got his tools and started working. The whole process took about 30mins or less and he was done. I...
Stephen J Tant Plumbing LLC
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Reviewed in April 2015
Owner and receptionist were both very helpful over the phone- owner had a few questions and provided ballpark estimate and then scheduled one of his workers to come out. Andrew came out to my house and was great- very friendly and professional- got right to work and was very considerate- I had...
Alpha Plumbing
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Reviewed in March 2015
I first called Alpha to investigate an intermittent sewer smell coming from inside the house. We hadn't really noticed any other plumbing issues but trying to locate the source of the odor was driving us crazy. I must first mention that the plumbing in our house has always been a challenge since...
Alpha Plumbing
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Reviewed in June 2014
Showed up on time. Staff is accommodating on the phone. Price was great. They are efficient and friendly service provider.
Alpha Plumbing
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Reviewed in November 2013
Same day quotes and even same day service! Super easy, accommodating and nice! This is the type of service companies should strive for, all at a great price. I received a few quotes and Alpha offered the best deal. I would definitely call them next time I need a plumber!
Alpha Plumbing
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Reviewed in October 2023
Recently used Mahon Plumbing for various plumbing needs around my house. As a new homeowner you can be skeptical on what’s behind your walls or in this case pipes. Mahon did an initial sewer line inspection and called them back to swap out toilets and install natural gas in my backyard for a...
Mahon Plumbing
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Reviewed in October 2023
Mahon Plumbing was not only professional, fair, and timely. Their professional courtesy and customer service was amazing. Couldn’t have made the process of installation any easier! Use Mahon Plumbing…no questions asked!
Mahon Plumbing
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Reviewed in January 2011
Sound of water constantly running in basement, but no visible water leaking anywhere. Water service pipe leaking according to county. Located company in Angie's List. Company said they had fixed other units in my development that had the butane pipe leak. County issued a time limit before...
Heil Plumbing
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Reviewed in March 2014
Ed the owner came out for the quote on time. There were no Biden fees. He was able to do it right away. This is the second time I have used them with the other time being at my old house. They were great and would use them again if needed.
Heil Plumbing
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Reviewed in January 2016
They were very professional. They came to my house few times and each time they came on time and always courteous. I did not shop around and based on my initial experience with them I felt comfortable and went ahead with them.
Heil Plumbing
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Gas leak repair technicians in Baltimore

Len The Plumber, LLC.

Len The Plumber, LLC.

Customers say: Super punctual

456 local quotes requested

29 years of experience

Len The Plumber, LLC. is a leading plumbing and drain company serving Central Maryland. Our certified professional plumbers are available same day to assist residential customers in Anne Arundel County, Baltimore City, Baltimore County, Carroll County, Cecil County, Harford County, and Howard County. Our knowledgeable plumbers have years of experience dealing with a wide variety of plumbing issues including plumbing repairs, drain cleaning, water heaters, well systems, heating systems, sewer, water, and gas lines. We’re open 7 days a week with no extra charge on evenings or weekends!

"Our first encounter with Len the Plumber for gas boiler repairs went well and lead us to purchase a service contract with them for the 15% discount. However once we needed actual plumbing services and after they provided their "free" HVAC annual inspection it all went downhill rapidly. As others have noted the %15 discount is a concept they don't really honor. We were charged $1100 for less than 30 minutes of work for a repair that only required one cut and a simple joint (We had already removed the drywall and trim for access) and about $30 in parts (which by the way good luck getting an itemized bill from these people). On the HVAC side they broke what was a perfectly functioning 4 yr old AC HVAC and then wanted to charge $1200 to figure out how they broke it plus whatever parts they dreamed up needed replacing. They tried to claim the capacitor was bad. BTW - they brute force discharge the capacitors on units as part of their "maintenance check", something they should never do. We had BGE come out since their info was on the installation tag on the air handler and they diagnosed the issue in less than 30 minutes finding the thermostat had been burned up by mis-handling by the Len tech. They also said they never brutalize the capacitors the ways these guys do unless there is already a suspected issue with it. That's because the capacitor could be damaged by the way they handle it at Len the Plumber. So the "free" annual HVAC check cost me 3 days of discomfort and $250. Len refuses to admit wrong doing and will not reimburse us. They got $5000 in fees from us in less than a year so they don't care if we leave because they know another sucker is just around the corner waiting to be taken. These guys should lose their license given their business practices. Stay away from them at all costs."

M F on July 2025

TNT Plumbing & Drain Service, LLC

TNT Plumbing & Drain Service, LLC

Recommended by 100% of Angi customers

52 local quotes requested

Hello! My name is Daniel Tant, I am the owner-operator of TNT Plumbing & Drain Service, LLC. I hold a Master Plumber/Gasfitter license in the state of Maryland. I have been in the plumbing industry with a specialty in residential service for more than 30 years. I love working one on one with homeowners to diagnose and repair common problems such as leaks, clogged drains, garbage disposals, installation of kitchen appliances, water heaters, sump pumps, new faucets, showers, and toilets, laundry tubs and hook up for washer/dryers. For all your plumbing needs, please call 443-457-8228. Veterans and first responders we here at tntplumbing appreciate all that you do. So we give a 15% discount on all services for you all. Thank you for your support. God Bless.

"Dan arrived on time and promptly went to work. He inspected the all of plumbing system and identified some minor potential issues. The install was clean and quick. Dan left the work area spotless when finished. I would definitely hire TNT in the future"

Bobby B on February 2025

Stephen J Tant Plumbing LLC

Stephen J Tant Plumbing LLC

Customers say: Quick response

Recommended by 100% of Angi customers

91 local quotes requested

We’ve been proudly supporting the Baltimore-metro area for over eight years. From minor leaks to major mishaps in both residential and commercial properties, we can address all your plumbing problems. SJT Plumbing has created longstanding, trusting relationships with customers throughout Maryland. Give us a call today.

"the contractor fixed the leak and installed a garbage disposal. Months later (the services took place in July of 2018), there have not been any further issues with leaks, and the garbage disposal is working well."

Robert W on December 2018

Aqueduct Plumbing Services

Aqueduct Plumbing Services

Customers say: Quick response

Recommended by 100% of Angi customers

45 local quotes requested

We are a family owned and operated business with several years of experience. We offer many plumbing services in Carroll, Howard, and east Baltimore Counties. Please reach out to us directly at 443-202-5623 for more information or to schedule a service. You can also book directly through our website at www.aqueductmd.com !

"Extremely well! I am very happy with the services provided."

Joseph L on March 2025

"Extremely well! I am very happy with the services provided."

Joseph L on March 2025

Customers say: Quick response

Recommended by 100% of Angi customers

2 years of experience

Wallace Plumbing takes great value into every repair and project entrusted to us. From the smallest faucet leak to your sump pump, or water heater installation you can count on Wallace Plumbing to complete the task diligently, professionally, and efficiently.

"Derrick did a great job! He worked efficiently and his communication was excellent. He left the bathroom spotless, fixed the toilet issue by replacing the mechanism in the tank, and showed me what he repaired. I highly recommend Derrick and will be calling him again if I have any plumbing issues in the future! Thank you Derrick!"

Kathy L on June 2025

Hamilton Plumbing, Heating & Air Conditioning

Hamilton Plumbing, Heating & Air Conditioning

Customers say: Super punctual

Recommended by 96% of Angi customers

77 local quotes requested

Hamilton Plumbing and Heating Co is a family owned and operated business serving the community since 1978! Offering superior quality work and excellent customer service. We are licensed and trained professionals in Plumbing, Heating and Air Conditioning. Specializing in Water Heaters.

"Vernon offered to check out our AC the same day. He called before arriving, and once he was here quickly went about his work, explaining to me what he was going to do and why. He quickly diagnosed the problem and solved it. We’ve found a new HVAC maintenance company we can count on. Great service, great responsiveness, good prices. Our AC is back up and running. Thank you, Vernon, and thank you Hamilton!"

Aaron C on July 2024

Redline Mechanical Services

Redline Mechanical Services

Customers say: Quality work

Recommended by 100% of Angi customers

19 local quotes requested

We are a locally owned plumbing installation and service company. We do not accept anything but top level service and professionalism from our employees and as a customer you will experience that first hand. From water heater replacement and clogged drains or just periodic maintenance and testing to commercial chiller installations we have extensive background in all aspects of the plumbing and gas industry to handle whatever you need including private well and septic needs. Our lead technician has held his master plumbing and gas license since 2009 and personally oversees all jobs. Licensed to operate in almost all 50 states, we are ready to help you with all you plumbing and gas fitting needs. Please ask us about out Customer Referral Discount.

"Did the job fast and was very easy to schedule with. Jamie did great and really took care of us."

Gunnar K on October 2024

"Did the job fast and was very easy to schedule with. Jamie did great and really took care of us."

Gunnar K on October 2024

Mahon Plumbing

6824 Fort Smallwood Road

6824 Fort Smallwood Road

Customers say: Quality work

35 local quotes requested

31 years of experience

Welcome to Mahon Plumbing Inc. We proudly serve the Baltimore/Annapolis region as your local plumber since 1994. We are a full service company offering quality plumbing, gas installation and services for residential, commercial and new construction. We have fully stocked vehicles that are ready to handle even the toughest jobs. License Information/Numbers: A202144, 11839, MP9438, 836 & 70650.

"I had a plumbing issue that I thought would turn into a major headache, but Mahon Plumbing made the whole process smooth and stress-free. They arrived on time, quickly diagnosed the problem, and had it fixed before I could even make a second cup of coffee. They were professional, knowledgeable, and even gave me a few tips to avoid future issues. The pricing was fair, and there were no surprises on the bill—just great service from start to finish. If you need a plumber who knows what they’re doing and won’t leave you with a mess, I highly recommend Mahon Plumbing. I’ll definitely call them again for any future plumbing needs!"

Bill V on February 2025

Pohlman Plumbing, Inc

611 N Hammonds Ferry Rd

Pohlman Plumbing, Inc

611 N Hammonds Ferry Rd

Customers say: Super punctual

82 local quotes requested

17 years of experience

Our Mission: Bringing Back the Personal Touch At the heart of our mission is a commitment to rekindle the personal connection with our customers. We aim to forge relationships that stand the test of time, grounded in the excellence of our work and the exceptional service we provide. As a proud locally owned and operated business, we are deeply invested in our community and dedicated to ensuring your satisfaction. We promise not to leave until the job is done right! Ready to experience the difference? Call or click to schedule your estimate today, and let us embark on this journey together!

"A shout out to a "Hero of the Season", Pohlman's Heating Specialist CJ, who again restored warmth to our home. With our""Old House" emergency/crisis challenges, it's comforting that skillful assistance is just a call away. A local family business, Pohlman & CJ always came through, ... even resuscitated/turned around a barely hopeful case. Over the last years, this company earned my trust & loyalty with competency & honesty ... thx!"

Gabriele H on December 2024

Roto-Rooter Plumbing & Water Cleanup

Roto-Rooter Plumbing & Water Cleanup

Customers say: Quick response

295 local quotes requested

90 years of experience

When you need an emergency plumber or a drain cleaner, call Roto-Rooter Plumbing & Water Cleanup. Your fast & reliable plumber can fix any plumbing problem, including sump pumps, toilet repair, faucet repair, faucet replacement, garbage disposals, water heaters, bathtubs, showers, and outside faucets. Roto-Rooter is best known for drain cleaning & sewer cleaning. We fix drain clogs, clogged toilets or sinks, blockage of main sewer lines, slow draining shower and bathtub drains, sewer lines and leaking or burst pipes. We also specialize in water damage restoration & water cleanup services. We can fix and clean up your flooded basement too. Roto-Rooter is a 24-hour plumber near you and provides emergency service.

"They wanted $542 just to install a basic kitchen faucet! Ridiculous!"

Stephen T on November 2024

"They wanted $542 just to install a basic kitchen faucet! Ridiculous!"

Stephen T on November 2024

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FAQs for gas leak repair projects in Baltimore, MD

Yes, most states require a plumber to be licensed, and for good reason. Hiring an unlicensed plumber could lead to poor quality work, costly future expenses, and potential code violations. Check our state licensing tool to review the local plumber guidelines.

As you browse our pro listings, take note of the “Angi Approved” badge. Angi Approved businesses meet our standards for certification, which include:

The owner, principal, or relevant manager passed a criminal background check
Required to have applicable state and local licenses
Maintain an average star rating of 3.0 or better on our network, if they have at least one review
Paying to advertise their services
Meeting any other eligibility criteria required by Angi

Keep in mind licensing is different from certifications. A license is a legal requirement to operate a business, while certifications are voluntary.

Fixing a gas leak costs about $45 to $150 per hour for a plumber or gas line specialist. The job’s overall cost will vary depending on the location of the leak. A leaky junction or connection behind the stove or dryer will likely cost about $120 to $170. But for a leak that requires a gas fitter or plumber to excavate a pipe in the yard, the cost could rise to $1,500 to $5,000. Keep in mind that gas leaks are very serious issues, so don’t hesitate to contact a plumber or gas line specialist immediately.

Fixing a gas leak can take anywhere from one to 24 hours, depending on the location and magnitude of the problem. A gas line specialist or gas plumber should be able to give you an estimated time to completion once they evaluate the situation. If your city’s utility company works to fix a gas leak, it will likely have information available about the anticipated time for gas service to be restored.

The cost of repairing a gas leak depends on the type of leak, its severity, and how difficult it is for the repair technician to reach it. Some of the most common gas line repair costs, on average, include:

Cap a gas line: $75–$150
Gas system inspection: $150
Pressure test: $75–$500
Damaged or corroded pipe: $6–$7 per linear foot
Repair gas leak: $120–$5,000

A local natural gas plumber, gas fitter, or gas line specialist should fix gas leaks. Installing gas lines and connections improperly can lead to dangerous gas leaks and explosions. Only a certified plumber or gas line specialist should run gas lines. This is not a job to try out DIY skills, so hire a professional gas plumber or gas line specialist immediately to find the cause of the leak and fix it quickly.

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May 5, 2025

6 Reasons Why Your House Smells Like Rotten Eggs

A rotten egg smell in your house can come from several sources, including gas lines, drainpipes, and drywall. Keep reading to learn the causes and solutions.

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Mar 22, 2025

Can You Use Galvanized Pipes for Gas?

Choosing the right pipe type for your gas lines can help ensure the safe use of your gas appliances. Find out if you can use galvanized pipe for gas in this guide.

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Mar 12, 2025

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Dangerous household gases can make you sick—and, in some cases, can be deadly. These are the five most common toxic household gases to be aware of.

Get matched with top gas leak repair technicians in Baltimore, MD

There are 32 highly-rated local gas leak repair technicians.

Need a pro for your gas leak repair project in Baltimore, MD?

Gas Piping

Faucets, Fixtures and Pipes Repair or Replace

Appliance (Major Gas Appliance) Installation and Replacement

TRUSTED BY BALTIMORE, MD HOMEOWNERS

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Get matched with top gas leak repair technicians in Baltimore, MD

There are 32 highly-rated local gas leak repair technicians.

Need a pro for your gas leak repair project in Baltimore, MD?

Gas Piping

Faucets, Fixtures and Pipes Repair or Replace

Appliance (Major Gas Appliance) Installation and Replacement

TRUSTED BY BALTIMORE, MD HOMEOWNERS

Verified Reviews for Gas Leak Repair pros in Baltimore, MD

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