Bluetit in batbox

Hi

For the past 3 years we have had a bluetit roosting in our batbox on the side of our house.

We are soon to move and I believe the new owner plans to build on the side which would mean the boxes will be removed.

I am wondering if we should remove the boxes before we leave while the weather is fine rather than leave it to the new owner who could take them away at any time.

Also, will the bluetit find somewhere else to roost?

I know it's silly but I'm quite worried about what will happen to it!