Key personnel

  • James Donald

    Managing Director

  • Charlotte Wood

    Commercial Manager

  • Sam Hooper

    Operations Manager

  • Rita Beard

    SHEQ & HR Manager

  • Gavin Sims

    Technical Manager

Passenger and crew transfer vessels.

We build versatile Patrol and Survey Vessels for fisheries protection, coastal security, harbour patrol, offshore support, hydrographic surveying, and environmental monitoring.

Designed for excellent seakeeping, endurance, and reliability, each vessel can be tailored with specialist survey equipment, advanced communications, interceptor craft deployment, and Uncrewed Surface Vessel (USV) support.

Combining robust construction with proven hull designs, Mainstay delivers safe, capable, and adaptable platforms for a wide range of maritime operations.

Patrol and survey vessels.

We build versatile Patrol and Survey Vessels for fisheries protection, coastal security, harbour patrol, offshore support, hydrographic surveying, and environmental monitoring.

Designed for excellent seakeeping, endurance, and reliability, each vessel can be tailored with specialist survey equipment, advanced communications, interceptor craft deployment, and Uncrewed Surface Vessel (USV) support.

Combining robust construction with proven hull designs, Mainstay delivers safe, capable, and adaptable platforms for a wide range of maritime operations.

We bring design, engineering, fabrication and marine experience together.

Our strength lies in combining practical boat building knowledge with modern engineering capability. We work across steel and aluminium, support complex vessel and infrastructure projects, and bring the right expertise together from the outset.

With in-house design knowledge, skilled trades, large workshops and direct deep-water access, we are able to solve problems properly; from first idea through to build, launch, maintenance and long-term support.

We solve complex problems on, in and around the water.

Our clients are practical, ambitious and technically-minded. They may operate commercial fleets, commission specialist vessels, manage marine infrastructure or develop new technology for the water - but what connects them is their mindset.

They value sound judgement, technical capability, discretion and long-term trust. They come to us when the project matters, when standard answers are not enough, and when they need a partner who can think as well as build.

We believe in understated excellence and practical innovation.

We believe marine engineering should be thoughtful, capable and honest. That means understanding the brief properly, challenging where needed, and delivering work with care, precision and integrity. 

Producing work that stands up in the real world.

We believe the future of the sector will be shaped by skilled people, better thinking and modern yards that are willing to evolve without losing the craft, pride and discipline that good marine work has always depended on.

Located in a dynamic waterway, providing space, access and discretion.

Situated on the Pembrokeshire coast, our yard offers the facilities and marine access needed for serious commercial vessel and engineering work. Not restricted by the pressures of crowded marine hubs or the assumptions that capability only sits in the usual places.

For clients developing specialist vessels, marine infrastructure or technically demanding projects, our location offers a rare combination of deep-water access, skilled trades, engineering knowledge and operational discretion.

Our heritage gives us depth. Our vision gives us clarity.

We are proud of the craft, discipline and experience built into this yard over many years. That heritage gives our work substance. It means we understand vessels, materials, marine environments and the standards complex projects demand.

Our focus is firmly ahead. We are building on that foundation with modern engineering thinking, in house technical capability and a clear ambition to support the next generation of marine projects.