For 20 years BridgeClimb have been decking tourists out in blue jumpsuits and walking them up to the top of the Sydney Harbour Bridge.

It has become the must-do tourist bucket list activity for newcomers to the city.

But Scenic World in the Blue Mountains has poached the $50 million-a-year contract, with promises of new climb routes and more picture opportunities.

After two decades, BridgeClimb's contract to run the Sydney Harbour Bridge has been won by Scenic World. Picture: BridgeClimb (Supplied)

Over their two decades in operation, BridgeClimb have taken four million people from 140 countries up to see the breathtaking view of the sparkling Sydney harbour.

But the government contract to operate the climb business went to tender mid last year, and there were 13 expressions of interest.

Scenic World in the Blue Mountains have won the rights, paying "significantly more" for a 20-year contract.

Hammons Holdings is the tourism business behind Scenic World.

CEO David Hammon said: “It’s a privilege to be entrusted with Bridge tourism operations and we are grateful to the State Government for the opportunity.”

Hammon also acknowledged that BridgeClimb paved the way.

"We acknowledge the pioneering work of Paul Cave in developing the Bridge into a popular tourist destination and look forward to working in partnership with the Government to build on that work.”

Four million people from 140 countries have donned blue jumpsuits with BridgeClimb in 20 years. Picture: BridgeClimb (Supplied)

Scenic World won the $50-million dollar a year contract, with promises of new climb routes and new technology. Picture: BridgeClimb (Supplied)

But BridgeClimb are understood to be furious. They have after all, been running the contract that they themselves pioneered to government, very successfully.

BridgeClimb Chairman Peter Cave said: "It has been a privilege for us to make a hero of the Bridge, and of every climber on every climb.

"We will continue to create unforgettable memories until our final climber."

And they have had quite the unforgettable climbers indeed.

He went on to thank his 1500 team members.

"Every one of our past and present team can hold their heads high on what we have created together.

"The team and our customers are our immediate priority.’

Scenic World is hoping to one-up BridgeClimb, offering climbs of the full length of the bridge and using innovative technology to make the bridge's history and connectivity a more central part of the experience.

The deal will include operating the Bridge Museum too.

A Roads and Maritime Services spokesperson said this is a game changing opportunity that will lead to both enhanced and new experiences for the attraction.

From October 1, Scenic World will be in charge of the climb. Picture: BridgeClimb (Supplied)

"Hammons Holdings outlined a strong and clear vision for developing new climb routes, improving accessibility and introducing new technologies for a more interactive and innovative visitor experience," the spokesperson said.

For all Customers booked up until 30 September 2018, BridgeClimb will be climbing as usual.

For any customers with bookings for after 30 September 2018, BridgeClimb will be in contact when there is further clarity regarding these bookings.