There's nothing more discouraging than getting up a hill and finding there are no curb cuts.
This way, a person with a disability isn't left hanging while the request works its way through the system.
It's naive to think that you're not going to have unexpected barriers. In real life, they occur all the time.
One of the best things to do is to consult the disability community. Have a student with a disability walk the campus with you. There is practical stuff that can be done quickly.