If you share the driveway then you have the right of easement. What that means is that you are entitled to have access to your back yard by driving there and neither party can block this access. If he tries, you can certainly stop him from doing so, or even get an order for him to dismantle his structure if he puts it up before you can fully act. Speak to a lawyer, and fast. You may have a problem if you don’t do anything until after he builds (I don’t know for a fact but it sounds like a very plausible thing to happen)
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