Measure the height from the ground to the door you wish to make handicap accessible and apply the 1:12 ratio. For instance, if the distance is 12 inches, the ramp must be 144 inches long, or 12 feet.
Assess the space you have to install a ramp. Use one long ramp, with a plateau every 30 feet, if you have the space. L-shaped ramps or switchback ramps serve smaller spaces efficiently. Switchback ramps must have landings at each turn.
Provide a transition from the ramp to the door. Create a stable, porch-like surface if there is no porch.
Draft an overhead view of where you plan to place the ramp. Include landings where needed. The plans must correspond with the ramp you've purchased. Having an outline helps placement.
Enlist the aid of a helper to set your ramp in place. Heavy, permanent wheelchair ramps require more than two people to install them. L-shaped, zigzag and very long ramps come in sections to make installation easier.