Opus has been appointed to a new framework with the charity as one of the lead consultants in a programme to accommodate the new Shannon-class lifeboat.
The Shannon is designed to be launched and recovered from a beach, decreasing response time during emergency call-outs.
The firm has already received instruction for modification work at Seahouses Lifeboat Station.
Brian Hillman, Fareham business director and technical director at Opus, said: “We are thrilled to be able to continue to support the RNLI and this commission represents over 10 years of collaboration. We’ve recently finished their programme of upgrades for the Tamar-class lifeboat and we are now looking forward to turning our attention to the Shannon-class vessel”.