Best Plumbers in Gaithersburg, MD
Researched by Directory Ventures Editorial Team · Last updated April 22, 2026
Compare top top-rated plumbers professionals in Gaithersburg. Read real reviews, check credentials, and get free quotes.
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Plumbers Cost Guide
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Plumbers Services in Gaithersburg
Frequently Asked Questions
How do I choose the right plumber?
Confirm the plumber holds a current state license (master or journeyman depending on the job) and carries active liability insurance — request a current certificate before work starts. Compare at least two or three Google-rated plumbers in your city before calling, and ask for a written estimate before any work begins.
What should I expect to pay for plumbing service in my area?
A diagnostic visit or service call runs $75–$150. Drain clearing costs $100–$350; toilet replacement $250–$550 installed; water heater replacement $900–$1,800 (tank) or $1,500–$3,500 (tankless). Sewer camera inspection is $150–$400.
How long does plumbing work typically take?
Simple repairs (leaky faucet, running toilet) take 1–2 hours. Water heater replacement is a half-day job. Sewer line repair or full repiping can take 1–5 days depending on scope.
What questions should I ask before hiring a plumber?
Ask for their license number and tier (master vs. journeyman), proof of general liability insurance, whether they pull permits for the job, and what their hourly rate is versus a flat project price. Get everything in writing before they start.
Are plumbers on this directory screened?
Listings are sourced from Google Business Profiles and ordered by real Google ratings and review volume. We display each plumber's star rating and total review count so you can make an informed comparison. Independently confirm licensing with your state board before hiring.
What if I have a bad experience with a plumber?
Contact the plumber in writing and request they return to address the issue. If work was licensed, you can file a complaint with your state plumbing licensing board. For billing disputes, dispute the charge with your credit card company and document everything with photos and written records.