An architectural house style featuring steeply-angled sides (roofline) that usually begin at or near the foundation line, and meet at the top in the shape of the letter A. An A-frame ceiling can be open to the top rafters.

The design consists of two sloping sides that meet at the top to form a triangle, with the base of the triangle forming the foundation. A-frames are commonly used as vacation homes or cabins due to their distinctive design and efficient use of space. The A-shape helps distribute weight evenly and allows for a spacious interior with high ceilings, while the sloping sides provide protection from the elements and allow for ample natural light.