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The best thing to do is have a local lawyer contact the county and see if they will give you an extension based on the issues with the tenants. Usually they will if a lawyer contacts them and it shouldn't cost you much.
You may have to bring a lawsuit against the tenants to force them to allow access or even evict them if your lease doesn't have a clause in it allowing you to force access. Again, the lawyer can send them a letter threatening a lawsuit if they don't allow access and if they harass the contractors. You may even want the contractor to record the interaction.
As I said, you can send the letters yourself but they aren't as likely to be effective and, in addition, the lawyer will phrase the letters in such a way that they can be used in a lawsuit later if it becomes necessary.