I know, but they don't say if it would cause them to hit me with the maximum taxes like others have said. I know I can't trust them to give me the "complete answer". That especially holds true when they say that they would "Use their judgement concerning the interior condition" if they're not able to view it. Since when are property taxes based on the interior condition of a home. It's always been about square footage, how many bed and bathrooms, etc.
No. It is about the value of the home. The square footage method is a kind of generic means to value a home but a home with granite counters, a Jacuzzi tub, a steam room, and an in home theater is going to be worth more than a home built with the most basic of materials and amenities when both are in the same location, age, and size.
Unless they are going to accuse you of doing work without a permit, they have all the information they should need to evaluate your home already.
If you want to contest a tax value, you can hire an independent appraiser (licensed of course) to appraise the house. Unless the gov wants to contest a licensed appraisers work, they have to accept the value they (the appraiser) placed on the house. That way the gov never has to be let in the home.