Kaymac Marine & Civil Engineering Ltd

Kaymac Marine & Civil Engineering Ltd is a multi-award-winning specialist contractor with a proven track record in delivering complex water infrastructure projects across the UK.

Established in 1976 as a diving contractor in Swansea, Kaymac has grown into one of the largest specialist commercial diving and marine civil engineering firms in the UK, serving the public and private sectors from offices in Swansea, Bristol, and Kent.

Our expertise spans the full lifecycle of water infrastructure projects, including:

Long sea outfall installations
Reservoir maintenance and rehabilitation
Flood defence construction and repairs
Culvert and bridge scour protection
Underwater asset inspections and repairs

With a strong focus on safety, innovation, and cost-effective solutions, we leverage cutting-edge technology and decades of experience to deliver time-sensitive and highly regulated projects. Our team of in-house chartered civil engineers, commercial divers, and skilled civil operatives ensures seamless project execution, meeting the highest industry standards.

We proudly support clients across the water utilities, environmental agencies, local authorities, marine ports, harbours, and nuclear power sectors.

Kaymac – Experts in Water Infrastructure & Marine Civil Engineering.

Severn Estuary Long Sea Outfall Replacement (2025)

Critical infrastructure upgrade in an environmentally sensitive location

Prioress Mill Raw Water Pumping Station (2018)

Prioress Mill Raw Water Pumping station (RWPS) is located in Rhadyr, near Llancayo, Monmouthshire, on the south bank of the River Usk. It abstracts at a rate of up to 318 ML/day, and is the primary supply to Llandegfedd reservoir, which then feeds Sluvad Water Treatment Works (WTW). Prioress Mill RWPS has been identified by […]

Llyn Teifi Spillway Rehabilitation Works (2017)

Llyn Teifi Reservoir is situated in a remote area on the western slopes of the Cambrian Mountains in Ceredigion, west Wales, and was created in the early 1960s by raising a natural lake. It is impounded behind six embankments constructed across natural low spots along its south-western margin, covering an area of just over 25 […]

Critical Long Sea Outfall Upgrade in the Environmentally Sensitive Severn Estuary

Kaymac Marine & Civil Engineering Ltd

Kaymac – Experts in Water Infrastructure & Marine Civil Engineering.

What we do: