Mediation has been encouraged as a primary alternative dispute resolution mechanism to deal with construction disputes in Hong Kong. Considering its cost and time advantages, mediation is expected to be welcomed by the parties in dispute. However, in the past decade, the rate of mediation adoption has not been particularly outstanding. While it is believed that voluntary participation is pivotal to successful mediation, the unequal footing of the disputing parties may negate voluntary attempts. Past mediation research mostly studied the determinants of mediation, the choice of mediation tactics, outcomes of mediation which is quite descriptive than theoretical. This study examines the forms of asymmetry and their existence or otherwise in construction dispute mediation. Manifestations of asymmetries were operationalized from literature. Data for the study were collected from Hong Kong's construction experienced professionals. The majority of the one hundred ninety-three valid responses are from respondents having over 20 years of work experience in the industry. Three forms of asymmetry were suggested by processing the data through a principal component factor analysis (PCFA). The empirical findings affirm the proposed forms of asymmetry derived from theory. Mediators should assist the disputants to: i) prepare well for the mediation and not to use financial resources to protract the mediation process; ii) investigate the actual happenings leading to the dispute as detailed as possible; and iii) develop genuine attitude for achieving a quick settlement.