Only if you assume everyone is sitting around doing nothing waiting for window repair work to arrive. More likely is that the effort and resources required to fix the windows will displace other economic activity which would have contributed positively to GDP numbers.

GDP is a flow measure. If you drain a dam the flow will increase for a while before you deplete your stock. There are stock measures of the economy, though they're difficult to estimate because an asset's value is only truly known when it is transacted. (And even then in a highly particular way.) One way to think about our capital markets is as an ongoing value-of-the-economy machine (or at least a subset thereof).

Wikipedia link if anyone wants to read more on broken window economics.

https://en.wikipedia.org/wiki/Parable_of_the_broken_window

It would show that there are enough resources to fix the windows.

Yes, and that's likeky to have an impact on later GDP values, as all that has not been spent on better investments than repairing windows.

Except for the UK that has terrible windows and a proper upgrade would lead to serious reductions of gaz imports, that are likely to sting this winter.