[skissane]

Not the US, but my dad just got one installed in his two story home, cost him around US$25k for installation of the lift/elevator itself, although he incurred a few grand more on modifications to create a space to install it in (would have been more but he did some of them himself). Not a new house, around 40-50 years old. In part, he got the idea because one of his neighbours had already done it. Plus his partner has dementia and climbing stairs has been becoming an ever increasing challenge for her.