In a recent NAHB survey of remodelers, more than eight out of 10 reported that installing grab bars (89%), higher toilets (85%) and curbless showers (82%) were the most common aging-in-place projects.

Widening doorways, the next most-common project on the list, came in at a distance 59%.

Even though the underlying motivation seems similar in both cases, walk-in bathtubs have not become nearly as common as curbless showers. Only 12% of remodelers reported installing walk-in tubs.

When NAHB began asking aging-in-place remodeling questions in 2004, curbless showers were about as common as wider doorways. But over the years, the share of NAHB remodelers installing curbless showers has grown from 54% to 82%.

NAHB senior economist Paul Emrath provides more details in this Eye on Housing blog post.