| Contact your local zoning board ASAP. They have the answers
| It's not going to be easy, but if the inspector finds out about
| after the fact it will be much harder.
| I had a co-worker who needed a ramp for his wife. The
| seemed ridiculous, but there wasn't a single one that didn't
| when explained by a friendly inspector.
That's really odd: I built my own ramp (knowing I'd be needing
it in the near future) and there were no, zero, nada, local or
national requirements for a ramp on a personal residence. Well,
there was one requirement; the footings had to go down 4 feet
into the ground, a foot farther than I expected.
What I did was go to a disabled access gov site & used their
specs for info & design. The ramp is almost finished; another
day will do it; and the permit expires next week. Only part I
really needed info on was handrail height; which I found easily
at the gov site, using their specs.
Now, if you were to put a roof over it, then there would be
requirements; but a ramp? No.
What state/locality are you in? Just curious.