I have edited this response due to having re-read Section 110 of the Strata Act which defines what is and isn’t a “Minor” change to a lot. Bear in mind, “minor” changes still require Owners Corp approval but that can be given by the committee if certain standard by-laws are in place.
With reference to the original question, subsection 7 (c) of Section 110 says that aspects defined as not being “minor” include:
(c) work that changes the external appearance of a lot, including the installation of an external access ramp,
In other words, they would require a special resolution. Have a look at the restrictions and definitions laid out in section 110, in my post below