The historic Holy Trinity Church in Roebourne — transformed last year after decades of neglect — turned 125 this week, with more than 50 people attending celebrations to mark the milestone.

Some travelled more than 1,600 kilometres to celebrate the anniversary of the church, which is the oldest in north-west WA.

Past Reverend of Wickham Richard Goskem said the historic building was almost lost in 2013 during Cyclone Christine.

"The roof was removed, the porch was demolished," Mr Goskem said.

"The salt leaching out of the mortar had rusted all the stained glass windows."

He said the community knew that if it wanted to see the historic building be part of the present it "had to get busy".