A laneway house is typically a small house built on the back of a property that faces the laneway. They have been a popular way to add density to urban areas and provide affordable housing options. Synonyms for the term "laneway house" include "coach house", "carriage house", and "granny flat". The term "coach house" refers to a detached building originally intended for storing horse-drawn carriages. "Carriage house" is similar, but can also refer to a garage or workshop. Finally, "granny flat" typically refers to a smaller unit that can be built as an extension of an existing home, often used to house an elderly family member. Regardless of the name, these types of homes have become increasingly popular in today's housing market as they provide an efficient and sustainable living option.