College App Help/Resources

I have been noticing some pressure drops and small leak signs around my home lately and I am starting to think about replacing the plumbing. Since our house is getting older I want to address the issues before major water damage happens. I never had to deal with complete pipe replacement before and I am wondering what main details should be checked first. How do you usually evaluate if a contractor provides transparent planning and fair conditions for whole house repiping in Sacramento? Recently I was reading about link to understand how the process works and what modern materials like PEX or copper are better for long term reliability. I would prefer to choose a service with clear explanations upfront rather than chasing the lowest quote. What signs of quality work or good communication do you look for when hiring specialists for such a big project?