Sell finished garage. Who will buy the garages from me?

Hello,

I would like to expand my garden and therefore sell and have two prefabricated garages picked up. Unfortunately, I can hardly find any information on this, but I was told you could get about €3500 for such a garage. That seems a bit optimistic to me.



What do you think you can get for them, ideally with pickup, and also who might buy something like that?

Thanks

Just for your information: The garages are a good 20 years old.