Hotel Rottnest is set to double in size and provide resort style accommodation on Perth's favourite holiday island.
Set to be renamed Hotel Rottnest Resort, the accommodation will add another 80 rooms, four swimming pools and a rooftop bar.
The makeover is part of a wave of new development on Rottnest Island, with the first sod turning on construction of a $20 million luxury 'glamping' resort at Pinky's Beach.
A world class day spa will be set up at Karma Rottnest and the final addiction to the Wadjemup Bidi walking trail has opened.
It comes as visitor numbers show Rottnest is even more popular this year, with more than 80,000 people making their way to the island last month.
That's a 15 per cent increase in visitor numbers for March last year.