Hello, I have what I think are house martins starting to nest in my garage. It seems they can only get in when I leave the door open. Soon I go on holiday. Should I disrupt the nest building or just let nature take its course?

Hello, I have what I think are house martins starting to nest in my garage/workshop. It appears they can only get in when I leave the door open (which I do regularly) - this morning one was lingering and immediately entered once I opened the door.
My dilemma is I am going away for a few weeks in 2 weeks time. I cannot leave the garage open as I have too much equipment in there. Should I disrupt the nest building at this early stage to encourage them to go elsewhere? Or just let nature take its course?
Any help appreciated,