Specialist Marine Civil Engineering Solutions for Complex Coastal & Marine Infrastructure

For 50 years, Kaymac Marine & Civil Engineering has delivered complex marine and civil engineering projects across the UK’s most challenging coastal, tidal, underwater and confined-access environments.

Founded in Swansea in 1976 as a specialist commercial diving contractor, Kaymac has grown into one of the UK’s leading specialist marine civil engineering contractors, trusted by public- and private-sector clients to safely deliver technically demanding marine infrastructure works nationwide.

Today, we support clients across the ports and harbours, water utility, energy and nuclear, rail, environmental and transport infrastructure sectors — providing integrated marine engineering solutions where access, safety and technical expertise are critical.

Specialist Marine Civil Engineering Contractors

Kaymac specialises in delivering marine and civil engineering projects in live operational environments, including:

Ports & harbours
Coastal & tidal infrastructure
Lock gates & flood defence structures
Water infrastructure & long sea outfalls
Bridge scour protection & marine foundations
Marine asset maintenance & refurbishment
Confined space & underwater construction works

Operating from offices in Swansea, Bristol and Kent, our teams deliver projects throughout Wales, England and across the wider UK.

With decades of experience working in high-risk marine environments, we provide clients with safe, practical and cost-effective engineering solutions from concept through to delivery.

Commercial Diving & Subsea Engineering

As one of the UK’s most experienced commercial diving contractors, Kaymac provides fully integrated in-house commercial diving and subsea engineering services.

Our specialist diving teams work alongside our civil engineering professionals to undertake:

Underwater inspections
Subsea construction works
Marine asset inspections
Underwater repairs & maintenance
Cofferdam & temporary works installation
Marine salvage & recovery operations
Confined space diving operations

This integrated delivery model allows us to safely undertake complex underwater engineering works while reducing programme risk, improving efficiency and maintaining full control over safety and quality.

Scour Protection & Coastal Asset Resilience

Kaymac is recognised as a leading scour protection contractor in the UK, delivering engineered solutions that protect critical marine and coastal infrastructure from erosion, tidal forces and long-term deterioration.

Our specialist teams have extensive experience delivering scour protection works for:

Bridges & river structures
Ports & harbour walls
Outfalls & coastal assets
Flood defence infrastructure
Marine foundations & revetments

We understand the importance of durability, resilience and environmental protection when working within sensitive marine environments and live operational assets.

Engineering Innovation in Challenging Marine Environments

Innovation has always been central to the Kaymac approach.

We continually invest in specialist marine plant, construction methodologies and engineering innovation to improve:

Safety performance
Programme efficiency
Environmental protection
Project certainty
Long-term asset performance

Our teams regularly develop bespoke temporary works, marine access systems and subsea engineering solutions to safely deliver projects in highly regulated and technically challenging environments.

Integrated In-House Marine Engineering Expertise

Our integrated in-house delivery model combines:

Chartered civil engineers
Commercial diving teams
Marine project managers
Temporary works specialists
Skilled marine operatives
Health & Safety professionals

This depth of expertise enables us to plan and deliver complex marine civil engineering projects safely, efficiently and to the highest technical standards.

Supporting Critical UK Infrastructure Sectors

Kaymac supports major public and private sector clients across a wide range of infrastructure sectors, including:

Water utility infrastructure
Ports & harbours
Rail infrastructure
Energy & Nuclear
Local authorities
Environmental agencies
Coastal defence & flood resilience

We are proud to support clients through major infrastructure investment programmes, including AMP8, CP7 and long-term coastal resilience initiatives.

Safety, Quality & Sustainability

Health & Safety, quality and environmental responsibility are at the heart of every project we deliver.

Kaymac has built a reputation for:

Outstanding Health & Safety performance
Collaborative project delivery
High-quality workmanship
Technical problem-solving
Reliable programme delivery
Sustainable marine engineering solutions

By working closely with clients, stakeholders and supply chain partners, we help deliver resilient marine infrastructure that supports safer, more sustainable coastal communities.

50 Years of Specialist Marine Engineering Experience

In 2026, Kaymac celebrates 50 years in business — remaining proudly independent, family-owned and focused on specialist marine and civil engineering delivery.

From our origins as a single commercial dive team to becoming a nationally recognised marine civil engineering contractor, our values remain unchanged: safety, integrity, technical excellence and long-term client relationships.

With five decades of proven delivery across Wales and England, Kaymac continues to lead the way in specialist marine, subsea and coastal civil engineering solutions.

Speak to Our Marine Engineering Team

Looking for an experienced marine civil engineering contractor for your next project?

Contact Kaymac Marine & Civil Engineering to discuss your requirements with our specialist team.

We are leaders in the fields of specialist sub-sea marine engineering in Wales and England. With five decades of experience, our specialist involvement is widely acknowledged by our clients.

Our Mission, Values and Culture

Our mission is to provide our clients with the most effective and commercially sound solutions, delivering a professional, high-quality specialist service. We are fully committed to sustainability and to safeguarding the safety, health and wellbeing of our employees, clients, communities and the environment in which we operate.

Our Values and Culture

Our people are at the heart of everything we do. We invest in our workforce and foster a diverse, inclusive and collaborative working environment where individuals are supported to grow and succeed.

By fully funding our training and development programmes, we ensure continuity of expert project delivery and the consistent application of best practice across all our operations. This long-standing commitment to our people was recognised in 1996 when we achieved Investors in People accreditation, an accreditation we continue to uphold today.

Our Core Values

Our five core values underpin how we do business and how we interact with our clients, colleagues, suppliers and the wider community.

1. Valuing Our People, Customers and Suppliers

We treat our people fairly and with respect
We provide a stable, safe environment where individuals can enjoy their work and progress their marine engineering careers
We build long-term relationships and seek repeat business from our clients
We develop strong, trusted partnerships with our suppliers

2. Respect for the Community and Environment

We actively support community projects that involve and benefit our employees
We minimise our environmental impact and act responsibly within the communities where we work

3. Openness and Honesty

We keep our people informed of company developments
We comply fully with all applicable laws and regulations
We work collaboratively and transparently with our clients

4. Pride in What We Do

We continually improve our marine engineering performance
We deliver everything to the highest possible standard
We reinvest profits to maintain a modern, extensive and reliable plant fleet

5. Balance

We encourage time to look after ourselves, our families, our friends, our clients and our health

We work hard, but recognise the importance of balance

Accreditations, Certifications and Memberships

We have a long history of maintaining industry-recognised accreditations and memberships that reflect our commitment to quality, safety and professional standards.

Link-Up Approved since 2003, maintaining RISQS approval to the present day
The majority of our workforce is trained for railway work, with 34 directly employed personnel holding PTS qualifications for work on Network Rail infrastructure, all sponsored by the Company and supported through NCCA
Founder member of the Association of Diving Contractors, with continuous membership over many years
Accredited with Investors in People since 1996, reflecting our ongoing commitment to training and development
Registered with Constructionline since 2002, achieving and maintaining Gold status
Certified to BS EN ISO 9001:2015, BS EN ISO 14001:2015 and ISO 45001 for the supply of diving and marine engineering services
Additional accreditations include CHAS, SafeContractor, Investors in People, UVDB and Building Confidence

As our civil engineering capability expanded, we aligned ourselves with respected industry bodies and became a member of the Civil Engineering Contractors Association in 2004.