1.5 story house plans can include Craftsman (typically Bungalow House Plans with two bedrooms upstairs), farmhouse designs with room for families, and traditional house plan designs that may feature a large bonus room that you can finish later.
With many 1 1/2 story house plans, you'll find the master suite on the main level for maximum convenience and easier aging in place. This is becoming a popular layout choice. When the secondary bedrooms are upstairs, it also gives the master suite extra privacy, which can be welcome with school-age children.
Other plans with 1.5 stories may feature large lofts upstairs. Use these versatile spaces as home offices, libraries, homeschooling centers, craft spaces, or even art studios.