Hi Patrol,
Where is your apartment located?
You will have more difficulties getting a tenant if they start renovation on the building, but assuming that it's only a noise issue and your apartment won't be directly affected, there may be ways of managing this, such as making the tenant aware of what will happen and reduce the rent accordingly. Builders tend to work from 7am-4pm and on Saturday mornings only, so if the tenant works all day, it may not be a huge problem.
The long-term prospects of having a totally renovated building hugely outweigh the short-term downsides. It's vital to make sure that a reputable developer does the work. I've seen many poorly executed or unfinished loft conversion projects.
I wouldn't plan too far in advance either just yet as selling the attic space can take a very long time and can easily fall through in the early stages. In my own building, the entire process took almost five years.