All,

So I just bought a condo, it has vinyl double hung windows.
Bad part is that they don't lock. I push the top window as far as possible, and the lower one down as much as it can go, but I am still 1/2 inch off from the latch being able to lock.

How can I correct this ? Is it expensive ? Can I DIY ?

Thanks,

I don't know if you can fix or replace the lock at all without replacing the entire window housing and stuff, but for a qick fix until you can figure it out, get some bars, metal items, or pieces of wood and put them between window's inside ledge and the window, for some extra safety.