This study documented the Ibanag, Itawes, and Malaweg's traditional ecological knowledge throughout the pre- and post-construction of their vernacular houses in Cagayan, Philippines. The study used semi-structured interviews, focus groups, and archives. The researchers found parallels in the Itawes, Ibanag, and Malaueg's actions and beliefs during house construction attributed to cross-cultural exchange. The researchers conclude that the three groups' housing beliefs and practices are influenced by superstitions (animals, plants, etc. that represent fortune or misfortune), religion (leaning toward or against days based on the Holy Rosary mysteries), and astrology (referring to the moon or a planetarium in determining the schedule for the commencement of the construction). Additionally, sexism was found to be a component in various housing beliefs and practices, such as women being banned from groundbreaking and excavators turning their heads when a woman passes. All of these beliefs and customs continue to be practiced because Cagayano families have an ingrained desire to live prosperously in their homes. The study recommends that these beliefs and practices be used as a springboard for lessons in basic and higher education specially in teaching indigenous science. As such, awareness and safeguarding of these beliefs will be reinforced.