Is water discoloured, or does pressure drop when another tap opens?
Repiping scope depends on the pipe material, the affected branches and how the plumbing runs through finished rooms. If you suspect galvanized pipe or poly-B, photograph accessible pipe markings and fittings, and note low pressure, discolouration or past leaks. Ask for a clear comparison between repairing one section and replacing a larger system. PEX and copper are possible replacement materials, but routing, fixture connections and access influence the choice, wall openings and restoration required.
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