As with any home renovation, the cost of having a permanent ramp installed will vary. Size is the most obvious factor. If you just need to clear a raised threshold, a modest ramp will do. But if you have to build a ramp up to a raised structure like a porch, that will take more doing and incur a higher cost. But broadly, you can expect a quality, permanent ramp to cost around $10 per foot of ramp being constructed.