Most whole-home repipe projects don't fail because a contractor made one dramatic error — they fail because small, cheap-looking decisions stack up.
These are the mistakes we see most often on Houston jobs, and the ones we vet every scope against before we start.
1. Crimp fittings instead of expansion
PEX-A with expansion is the current best practice. Crimp fittings are more failure-prone.
2. Partial repipe
Repiping half the house leaves the failing half to leak next month.
3. Undersized branches
Weak flow forever. Use proper fixture-unit sizing per plumbing code.
4. No manifold
A home-run manifold is a game-changer for shutoffs and repairs. Skipping it is a missed opportunity.
5. Skipping insulation on hot lines
Wastes energy and causes condensation in walls.
6. No permit
Whole-home repipes require permits in Houston. Skip it and resale suffers.
7. Reusing old fixture stops
Old multi-turn valves seize. Replace with quarter-turn ball valves during the repipe.
8. No PRV or expansion tank
High Houston pressure kills the new system without protection.
9. Vague drywall repair scope
A repipe damages walls. If the scope doesnt define patch/texture/paint standards, expect fights.
10. Not addressing the water heater
A repipe is the moment to rebuild WH connections and shutoffs.
How to vet your contractor
Read your whole-home repipe bid line by line and ask which of these mistakes are being avoided — in writing. A contractor who welcomes the question is the one you want; a contractor who deflects is the one to walk away from.
If you'd like a second set of eyes on a scope of work or an existing bid, we're happy to walk through it with you.
