Does the Assessor have to be let into your home
The New York State Assessors' Association pamphlet, "Understanding Assessments and Property Taxes", states:
The Assessor has a right to go into your front door and seek admittance (Possibly he or she will only want to inspect the exterior of the house) but must leave the premises if asked to do so.
If it is really inconvenient to allow an inspection at that time, tell your visitor just that and try to make an appointment for some other date. However, if you can spare the ten minutes or so that will usually be required, we urge that you allow it to proceed so that the information necessary for equitable assessment can be gathered.
The pamphlet cautions property owners not to allow anyone into their homes without proper identification, preferably I.D. cards with photographs signed by an authorized town or city official. "No identification - no entry!"