Repiping means replacing the supply piping in a building rather than patching individual failures. It’s a big decision and nobody should make it casually, but there’s a point where the arithmetic flips. Once a system is failing from age or material rather than from a single bad joint, every repair is buying a few months, and the ceiling and drywall damage from each event costs more than the plumbing did.

The tell is the pattern. One leak is an event. Leaks in different locations, on different lines, in the same building over a year, are a system telling you something. In commercial and multi-unit buildings that pattern is expensive, because each event affects tenants, common areas and whatever sits below the failure.

The good news is that a repipe in an occupied building is a scheduling problem more than a plumbing problem. Buildings can be done in phases, riser by riser or floor by floor, with water restored at the end of each work window. That’s how a hotel or an apartment complex gets repiped without going dark, and planning that sequence is most of the work.

Galvanized steel is the classic case. The interior zinc coating wears away, the steel underneath corrodes, and rust builds up inside until the usable diameter shrinks and the wall thins. You get lower pressure, discolored water, and eventually failures at the thinnest points. It doesn’t fail all at once, it fails progressively everywhere, which is exactly why patching stops working.

Copper fails differently, with pinhole leaks. Water chemistry, velocity from undersized lines, or poor electrical grounding through the plumbing all attack copper from the inside. When pinholes start appearing on multiple runs rather than at one elbow, the cause is systemic and the rest of the pipe is on the same trajectory.

Florida’s slab-on-grade construction complicates all of it. Supply lines running under the slab can’t be inspected visually and can’t be spot-repaired without breaking concrete. That’s why a lot of commercial repipes here go overhead instead, running new lines through walls and ceilings and abandoning the under-slab pipe in place. It’s less invasive, it’s serviceable in the future, and it removes the slab from the equation permanently.