The company, which initially had a three-year contract, has exercised its extension options to continue providing engineering, procurement and offshore construction services for another two years.

The scope of work will focus primarily on Fairfield Energy's Dunlin platform in the East Shetland Basin.

PD&MS Energy CEO Simon Rio said the company had worked closely with its client during the initial three-year term.

"In the initial term the focus was mainly on small projects and anomaly-type work that covered our major disciplines including piping, mechanical, structural, electrical and instrumentation and, more recently, HVAC [heating, ventilation and air conditioning]," he said.

"We are hopeful we can build on this through the new term."

Rio said there was a growing demand for effective, cost-efficient design and engineering services across the global oil and gas, drilling and marine industries.

"This is particularly important in the North Sea, however, where the production efficiencies of fields has fallen from 80% to 60% over the past seven years and several fields now cost more than £40 [$A73] per barrel to operate," he said.

"Operators are looking to maximise the value from their assets through consistent, reliability-driven operational efficiency."