Design of fixed offshore platforms is performed in accordance with the regulatory guidance as API Recommended Practice 2A-WSD. However, when extending the lifetime of existing platforms beyond their designed lifetime, structural degradation, marine growth and updated knowledge of the recorded environmental conditions at the exact location where the platform was operated must be taken into account. In the present study, the specific requirements are reviewed for fixed gas exploitation platforms operating in the Croatian part of the north Adriatic Sea. The paper firstly provides overview of the present offshore activities and existing platforms in the Croatian part of the Adriatic. Further, following aspects relevant for the lifetime extension framework of fixed platforms are considered: description of the environmental conditions and seismic characteristics in the north Adriatic Sea, expected severity of the corrosion and marine growth in the region and procedures for strength and fatigue assessment. The aim of the paper is to review state-of-the-art analysis models and computational tools and to serve as the guidance for the engineers involved in the design, inspection, maintenance, and lifetime extension of fixed offshore platforms in the Adriatic. Also, research needs for the improvement of the existing inspection practice are identified.