build onto

verb

built onto; building onto; builds onto

: to add (a new room) to a structure that already exists

They built a new garage onto their house.

They built onto their house.

Examples of build onto in a Sentence

Recent Examples on the Web

After Willa’s bedroom was built onto the small house, the cottage was dressed to show the accumulation of the years the father and daughter had lived there. —Pat Saperstein, Variety, 27 Sep. 2025