Direct Answer
To hire a reliable plumbing repipes & sewer line replacement contractor in Baltimore: (1) Get 3 written quotes with line-item breakdowns, (2) Verify MD license at Maryland Home Improvement Commission (dllr.state.md.us), (3) Confirm active general liability and workers' comp insurance, (4) Check Google and BBB reviews specific to Baltimore projects, (5) Never pay more than 10-30% upfront — never pay in full before completion.
Full Explanation
Red flags specific to Baltimore contractors: no physical Baltimore-area address, pressure to start immediately, cash-only payment demands, and license numbers that don't verify at Maryland Home Improvement Commission (dllr.state.md.us). Seasonal demand during summer brings out less reputable contractors.
Local Factors in Baltimore
📍Verify license: Maryland Home Improvement Commission (dllr.state.md.us)
📍File complaints: Maryland Home Improvement Commission (dllr.state.md.us)
📍Homeowner protections under MD consumer protection law
📍BBB Greater Baltimore chapter for complaints history