December 2025 WATERLINE | 9 FEATURE SUPERYACHTS The global superyacht fleet is expanding in size and complexity; therefore, marinas are re-evaluating the design required to accommodate vessels now commonly 70m and with some exceeding 100 metres. Our industry provides a great guest experience and service delivery; however, the real foundation of success lies in the infrastructure, and the engineering below the waterline. LOAD, SCALE AND DURABILITY Superyacht berths are subject to significantly higher static and dynamic loads than conventional marina systems. Cleats, bollards and fenders must be designed for high-tension mooring lines and even with loads shared, the working load per cleat is much higher. Tying the vessel to the piles is no longer a standard option. Pontoons are designed with a higher freeboard, often 600 to 750mm, with reinforced aluminium or timber walers, and usually with a concrete pontoon. Exceptional stability is expected with vehicular access preferred. Advanced modelling and simulation tools are often employed to optimise structural performance and ensure safety. Materials must balance strength with corrosion resistance; and even though non-ferrous fixings are preferred to achieve long service life in tropical and temperate environments, galvanised steel is still used when the load design demands. POWER, WATER AND UTILITY INTEGRATION The largest superyacht berths in Australia have 600A of shore power and bunkering of fuel use direct discharge from water or trucks. Integrating high-capacity three-phase power along with other lower capacity outlets means smart pedestals with lots of options. All of this large-volume complicated infrastructure demands careful design work in electrical and hydraulic engineering. The conduits that carry these services are carefully routed around the key structural elements that make the whole system work without compromising structural integrity or visual appeal. ACCESS, SECURITY AND PRIVACY Infrastructure must support seamless access for guests and crew while maintaining emergency and service vehicle accessibility. Floating pontoons and gangways need to maintain ADA-compliant gradients at varying tidal levels, while security bollards, discreet CCTV, and keyless/facial recognition digital access integrate seamlessly into the marina fabric. ENVIRONMENTAL AND REGULATORY EXPECTATIONS Modern marina construction faces expectations to provide environmental stewardship and circular-economy compliance to maintain our social licence in these pristine environments. Minimising seabed disruption, selecting recyclable materials, and enabling modular deconstruction are now baseline expectations from both regulators and owners. Floating solar, low-impact lighting, compliance with electric charging protocols, AI CCTV systems and real-time environmental monitoring further enhance our sustainability credentials. FUTUREPROOFING THROUGH MODULARITY Adaptability is key to future marina design. This goes beyond simply using larger cleats on existing T-heads to become a “Superyacht Marina”; it requires infrastructure that can evolve with changing yacht dimensions and therefore fit in safe fairways to manoeuvre. Modular pontoons and floating cleats on mooring piles offer flexibility but not all marinas can accommodate the spatial demands of superyachts without compromising overall capacity. A strategic market analysis is essential before undertaking berth reconfigurations for Superyachts, because not all marinas are suited to this type of vessel; in fact, the economic viability of the business could suffer as well. Building for superyachts is not merely a matter of scaling up - it’s about engineering intelligent, resilient, and sustainable systems that quietly elevate the marina experience both above and below the waterline. ENGINEERING EXCELLENCE BELOW THE SURFACE CONSTRUCTION CONSIDERATIONS FOR SUPERYACHT INFRASTRUCTURE By John Hogan, Director Marine Structure
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