I called back the Human Rights Commission to file my complaint today and was told that I actually did NOT have grounds to file a human rights violation complaint. I wish I had known that before I went and got the developer angry. This is not good.
So now what the HRC told me was that I have to call the building code people back and see if there's anything in the code stopping me from building a ramp. If there is, then there's nothing I can do. If there isn't, then she said I should approach the builders and ask if they would build a ramp at my expense. If they will, great. If they won't then there is nothing stopping me from building my own. If the developer gives me a hard time about building a ramp when I am entitled to, THEN I can file a human rights violation complaint.
Man, this is complicated!