What is a good angle for a handicap ramp and a formula for steps?
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There is no formula for a ramp, you need to work with whatever is comfortable for you. If the ramp is starting at 2' high, even a 6' length should be comfortable but longer would be far, far easier in the long run.
Deck steps (ready made) are often designed to be installed at a 45deg angle so the tread is level & the riser is vertical, but if you are making your own then any angle will do, just make sure the treads are horizontal & the risers, vertical. Also worth noting - try to make every riser the same height, having three risers at 6" and one at 4" is just inviting a trip hazard.
Contrary to popular opinion, there are ADA requirements for ramps.
https://www.adawheelchairramps.com/wheelchair-ramps/ada-guidelines.aspx
I would suggest hiring a contractor that is familiar with ADA guidelines and also mobile home construction. Google, flip through the yellow pages, contact neighbors, contact you local chapter on the Department on Aging and any senior center that might be able to help. I am on Nextdoor.com and have received a few good referrals from my neighbors.
Here is how to hire a contractor:
https://www.consumer.ftc.gov/articles/0242-hiring-contractor
Naomie is correct. There are ADA requirements. You also need to check with your homeowners insurance on what and how they provide coverage.