Laser scanning was developed for the offshore oil industry to help in initial construction and subsequent retrofitting of complex engineering structures. This includes capturing complete 3D surveyed as-built structures and providing visualisation that are easily comprehended. This provides a powerful tool in the design of solutions where structures need to evolve to integrate new processes or serve adapted purposes and the retrofitting of new components of plant is required. We can capture complex as-built engineering work using laser scanning and model the data in 3D. This allows clash detection for any retrofitting designs and avoidance of expensive remedial work should engineered solutions not fit the as-built space.