We have delivered an
Exceptional Quality Service
for our clients since 1976
Engineering Innovation Above and Below the Waterline 


We are a Passionate, Driven and Dynamic Team of Master Planners, Multiskilled Operatives, Civil Engineers, Commercial Divers and Doers.

Kaymac are a specialist civil and marine engineering contractor – experts in delivering unique and turnkey in-water construction challenges.

Kaymac has an ‘in-house’ delivery model that maximises efficiency and flexibility, with a diversified workforce capable of generating alternative, innovative solutions. We maintain a highly trained, qualified, and experienced workforce that complements our strong safety culture and commitment to excellence and customer satisfaction.

We deliver efficient, value-driven engineering solutions for the construction industry. Safety and innovation are at the core of everything we do, together with a ‘can-do’ attitude and personal attention to client needs.

Kaymac are experienced, multi-disciplined specialist marine and civil engineering contractors

From our company's roots as commercial diving contractors right through to rail engineering and civil engineering for coastal and inland waterways, Kaymac's comprehensive list of services continues to expand to meet the requirements of clients nationwide. We provide pioneering marine and civil engineering solutions to meet the needs of our customers: Engineering innovation above and below the waterline.

Capabilities include:

Principal Engineer, Swansea Council

“Kaymac have always provided an excellent, economic, efficient and effective service. They have delivered quality workmanship, safely, to programme and within available budget. They were easy to work with on site and the final account was settled amicably, with no disputes. I will look forward to working with them again.”

Gordon Randlesome BSc(Hons), C.Eng, MICE

Crickhowell & Llangynidr Bridge Repairs

I’d like to say thanks for all your help in competing the remedial works to Crickhowell and Llangynidr bridges ready for another winter. Dean and his team worked well, were professional at all times and really easy to work with. CADW are happy with the repairs and we have even had a few locals stop and say how great the repairs look.

Jon Watson, Civil Engineer MICE Engtech, Powys County Council.

Cobb Valley Viaduct

Kaymac provided an excellent and reliable service throughout the whole project. The Communication between everyone on site was continuous which ensured clarity with all staff members. The Kaymac team had a great understanding of the project as a whole particularly with the safety and site-specific tasks that were required, and as a result, the project was very successful. A big thank you to Jeff and the team for their impressive work on this high risk project, I will look forward to working with you in the future on other projects hopefully very soon.

Kieran Edwards, Resource Manager, Amey Rail Ltd

Llyn Teifi Spillway Rehabilitation

This was a first for DCWW to deliver such a challenging scheme in a remote location which had a very high risk in all aspects. Fantastic workforce, professional approach to every aspect of the scheme. Very impressed with their H & S, communication and performance on site.  As this was a unique scheme and there were a few lessons learnt during the works. A few issues with design change but resolved in a timely manner. Delivered on programme-excellent teamwork with all involved; I would defiantly use in the near future.  

Keith Daniels, Project Coordinator, Dŵr Cymru/Welsh Water

Flat Holm Jetty Construction

I would like to thank all of the Kaymac team for delivering an exceptional standard of product and service from start to finish on this project. Kaymac has successfully delivered on all promises made from the outset, and it’s been a genuine pleasure working with everyone across the business. A project as specialised as this would only be successful with the right team, both on and off the island, and it has been clear all along that this was carefully considered and delivered. It was also a pleasure to meet the site team, led by Alan, who are a great bunch of lads who have clearly gone the extra mile to deliver this project in a particularly challenging environment.

Thanks again to all concerned at Kaymac Marine and Civil Engineering, and we look forward to working with you again at some stage in the future.

Andrew Wheten, Project Manager, Cardiff Council

The Bristol Port Company

We have had an excellent working relationship with Kaymac for over 23 years, the team highly experienced in Marine and Civil Engineering operations; they are able to manage jobs on flexible working hours and have excellent attention to detail. We are always happy with the service and professional approach. 

Ian Russ, Project Engineer
About us
Kaymac are market leaders in specialist subsea and marine engineering

With over four decades of experience, our specialist involvement is widely acknowledged by our clients. We provide innovative marine civil engineering solutions to meet the needs of our customers- It is our exceptional customer focus and deep understanding of their needs which builds strategic long-term relationships.

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