The Internet is an indispensable platform for the provision of products and services of a company and for the communication with customers. A significant increase in the number of e-commerce interfaces in the Business-to-Business (B2B) environment has already been noticed for several years. One of the biggest challenges facing small and medium-sized enterprises (SMEs) in the construction industry is the complex issue of retaining customers in B2B-relationships. Especially in an internet-based, constantly changing context, this is an uncertain and ambitious challenge. In our study, we investigate the antecedents of customer loyalty of B2B-customers using the internet. Based on the findings of Janita et al., we developed a conceptual model containing the constructs potentially influencing loyalty of B2B-customers in the internet. Conducting an online survey with the B2B-customers of WERU, a German industrial component manufacturer in the building sector, our final data set contains 187 observations. Results show a direct, highly significant effect of customer satisfaction and trust and a highly significant total effect of image via customer satisfaction on customer loyalty.