Amid all of the design world’s triumphs in recent years, the spalike bathroom ranks high. “In prewar construction, bathrooms were not necessarily the prized possessions that you see in today’s day and age,” says New York designer Phillip Thomas. Indeed, it can seem like bathrooms today are becoming ever more luxurious, with 22 percent of homeowners enlarging their primary baths during a renovation — according to a 2023 survey by Houzz — and many of them adding amenities like soaking tubs and steam showers.