Legal Question in Real Estate Law in Illinois

Can't say w/o additional info. Is this a new home? Builder should have obtained your occupancy permit by the time you closed so this should not be an issue. You should call the local building department and ask why they need access. It is possible that they want to make sure that if the house was built with an unfinished basement that it remains such - many people will buy and pay for homes with unfinished basements because the permit fees are less and frankly taxes on unfinished space is less and after closing have them finished without permits...., so this may be a way for the building department to see if you "sneaked in" a finished basement. Or it may be a subdivision where there is a maximum amount of finished space was allowed and they need to keep track of it.... So w/o your calling to understand what the point is, and without knowing more about the house, can't say. However, if the builder didn't close out the building permit with an occupancy permit, that's a different story. Beyond that, building departments can gain access for certain purposes, and until you know it is a legit purpose by calling, you should have the right to first find out why. Once you do (if you can) then get back to us if you still have concerns.