How to make sure land is build able

[Christopher O'Morchoe]

I am trying to help a client purchase land to build a home, he has a builder already but the builder only does foundation up. They won't touch water/well, septic, or power. Who do I need to get in contact with/ what steps need to be taken before he puts an offer in. Or should we put in an offer contingent on feasibility of utilities? Any advice helps! Land is in Kitsap county WA