The field is developed by a single central combined drilling and production platform. The Magnus jacket is the largest single piece steel structure in the North Sea. It was designed, manufactured and installed by John Brown Offshore. The original system also included seven subsea producing wells which were later turned around to water injection duty.

The produced oil is transported by a 91-kilometre (57 mi) long 24-inch (610 mm) pipeline to the Ninian Central platform, and further to the Sullom Voe Terminal. Produced natural gas from Magnus, together with gas from the Thistle and Murchison fields, is transported by a 79-kilometre (49 mi) long 20-inch (510 mm) pipeline to Brent A and further through the FLAGS to St Fergus in Aberdeenshire.