In regards to renderings, those are considered a professional service as well and therefore typically not taxed (depending on jurisdiction). Reimbursables are after taxes/no taxes due to being professional service - think about when you get reimbursed for spending from your firm, it is typically a separate check with no taxes involved - reimbursables typically aren’t counted as income.
Could you please clarify why professional services are not taxed and what other services would be similar?
I’m not sure I make the distinction between drawings and 3D models/ visualization services. I would have said that all the instruments of service are professional services, since architecture is a professional practice.
It is usually in the tax code of the various states so it could be a number of reasons why professional services are not taxed - for example Illinois has been floating a tax on professional services to help shore up finances for a number of years but it hasn’t been enacted. Professional services are any services from those considered professionals - doctors, architects, lawyers, accountants, etc… You’re right that all instruments of service would be considered professional service - the way the question is worded appears to assume the rendering came from an outside vendor and therefore is a reimbursable.