The biblical book that tells the story of Noah building the Ark and surviving the Flood is Genesis.
The narrative runs mainly through Genesis chapters 6–9. Genesis 6 introduces the corruption of the earth and gives Noah instructions for building the ark. Genesis 7 describes the Flood, Genesis 8 describes the waters receding, and Genesis 9 presents the covenant and rainbow.
Genesis is the first book of the Hebrew Bible and the Christian Old Testament. Its opening section covers creation, early human history, and the ancestors of Israel before the narrative turns toward Abraham’s family. Noah’s story stands between the accounts of Adam and the patriarchs.
Other biblical books refer to Noah, including Ezekiel, Isaiah, and the New Testament writings, but they do not provide the main ark narrative. That is why Genesis is the specific source for the construction and Flood sequence.