Repowering
Engine, gearbox, shaft line, propeller, foundations and supporting systems.
SHIP RETROFITTING & CONVERSION
Renewing vessels.Moving towards net zero.
Repowering, role conversion, life extension, compliance upgrades and integrated low-carbon solutions—engineered for practical shipyard execution.
Explore retrofit services ↓ASSESS · RE-ENGINEER · INTEGRATE · VERIFY
NEW CAPABILITY FOR EXISTING VESSELS
Extend service life. Improve performance.
Marine House provides complete engineering and practical shipyard support for vessel retrofit, conversion and life-extension projects.
We help owners adapt existing vessels to new operational requirements, enhance reliability and comply with evolving classification, statutory and environmental regulations.
Our support continues beyond drawings—from onboard survey and feasibility assessment through class approval, installation, commissioning, sea trials and delivery.
PerformancePower, speed and efficiency
CapabilityNew role and operating profile
ComplianceClass, flag and environment
Future-ReadyPathway towards net zero
CORE CAPABILITIES
Re-engineering the complete vessel.
A successful retrofit coordinates structure, stability, machinery, electrical systems, class requirements and shipyard execution as one project.
Role Conversion
Adaptation of an existing vessel for a new mission, cargo or operational profile.
Life Extension
Condition assessment, steel renewal, modernization and reliability improvement.
Compliance Upgrades
Class, flag, statutory, safety and environmental modifications.
System Integration
Mechanical, structural, electrical, control and operational interfaces.
REPOWERING
Match the complete propulsion chain.
Repowering is more than replacing an engine. We assess the propulsion system as a connected chain—from power demand and gearbox ratio to shafting, propeller, cooling, exhaust, electrical supply and controls.
The result is a buildable installation designed to improve reliability, fuel efficiency, maintainability and vessel performance.
01Existing propulsion-system assessment
02Main-engine and gearbox selection
03Engine–gearbox–shaft–propeller matching
04Propeller redesign and optimization
05Foundations, shaft line and alignment
06Cooling, fuel, exhaust and ventilation modifications
TARGETING NET ZERO
Today’s vessels. Tomorrow’s emission targets.
Many vessels that will operate in the coming decades are already in service. Retrofitting therefore has a critical role in maritime decarbonization.
Marine House develops practical, phased pathways that deliver immediate efficiency improvements while preparing vessels for cleaner fuels, advanced power systems and future emission requirements.
PHASE 01
Improve Efficiency Now
Propulsion optimization, machinery upgrades and smarter power management.
PHASE 02
Prepare for Cleaner Fuels
Fuel-ready arrangements, space reservation, safety planning and system interfaces.
PHASE 03
Integrate Low-Carbon Technology
Dual fuel, hybrid power, batteries, shore power and energy management.
PHASE 04
Maintain Future Compliance
Flexible engineering for evolving IMO, class, flag and regional requirements.
GREEN RETROFIT SOLUTIONS
Practical steps towards lower emissions.
Each solution is evaluated against vessel profile, remaining life, available space, infrastructure, safety, downtime and lifecycle value.
Dual-Fuel Conversion
Engine feasibility, storage, fuel supply, ventilation, hazardous areas and safety systems.
LNG & Methanol Ready
Fuel-ready layouts and staged conversion planning for new energy pathways.
Ammonia-Ready Design
Space, materials, segregation, ventilation and future safety considerations.
Hybrid & Battery
Load profile, battery capacity, charging, power conversion and energy management.
Shore Power
Electrical connection, load coordination and reduced emissions while alongside.
Efficiency Optimization
Propellers, appendages, machinery systems, monitoring and operational measures.
ROLE CONVERSION & LIFE EXTENSION
Renew the asset. Redefine the mission.
We assess structure, stability, machinery, space, systems and remaining life before developing the conversion solution.
01Dumb barge to self-propelled vessel↗
02Cargo vessel to specialized service vessel↗
03Passenger, utility, research and survey conversions↗
04Capacity, cargo and operational-profile changes↗
05Steel renewal and structural reinforcement↗
06Machinery, piping, electrical and safety modernization↗
07Stability, class and statutory reassessment↗
PRACTICAL SHIPYARD SUPPORT
Engineering that works onboard.
Actual vessel conditions often differ from legacy drawings. Our engineers verify onboard, resolve interfaces and support implementation without compromising safety or compliance.
01Onboard SurveyCondition, dimensions and existing-system verification.
02Production SupportDetailed drawings, field engineering and design clarification.
03Installation SupportFit-up, alignment, machinery, piping and electrical coordination.
04Class CoordinationApproval comments, surveys and compliance close-out.
05Quality InspectionMaterials, workmanship, testing and non-conformity follow-up.
06Supplier InterfacesEquipment data, foundations, services and control integration.
07CommissioningSystem activation, harbour testing and fault resolution.
08Trials & DeliveryPerformance verification, as-built records and final acceptance.
OUR RETROFIT APPROACH
From existing condition to renewed capability.
01
Inspect
Survey and condition verification
02
Evaluate
Feasibility, risk and lifecycle case
03
Engineer
Class and production design
04
Implement
Shipyard and integration support
05
Verify
Commissioning, trials and delivery
ENGINEERED FOR THE WHOLE LIFECYCLE
The right retrofit—not simply more equipment.
Recommendations are balanced against technical benefit, installation complexity and the owner’s commercial priorities.
Technical FeasibilityStructure, stability, machinery, space, weight and interfaces.
Economic CaseCapital cost, fuel saving, downtime and remaining service life.
Operational FitMission, reliability, maintainability and crew requirements.
Future FlexibilityReadiness for new fuels, technologies and emission regulations.
PLANNING A VESSEL UPGRADE?
Retrofit today. Ready for tomorrow.
Engage Marine House for independent feasibility, complete conversion engineering, class coordination and practical shipyard support.
Discuss your retrofit ↗