The assessment of building reliability is a critical aspect of the functional feasibility system, as outlined in the 1998 Technical Instructions of the Directorate General of Human Settlements. These assessments typically encompass architectural, structural, and utility criteria. This research aims to understand the role of consultants in evaluating the functional feasibility of buildings in Banda Aceh. Purposive sampling was employed with 11 respondents, considering factors such as education, legal, and technical expertise. Data analysis involved factor analysis using the KMO-MSA method and descriptive analysis using SPSS software. The results reveal that consultants play a crucial role in assessing the functional feasibility of buildings, particularly in terms of skill competency, integrity, and professionalism, with a significant emphasis on the suitability of the function and specifications of the requested buildings. Moreover, the legal factor variable emerges as pivotal in consultants’ activities, ensuring compliance with statutory regulations. This study underscores the importance of consultants in ensuring building reliability and adherence to stipulated provisions.