Trinity house (Philadelphia)

[1] Trinity houses are characterized by small size, with three or four floors vertically stacked, each usually consisting of one principal room, many of which were built in the 18th and 19th centuries.

The selection of furnishings for such houses is strictly limited by the difficulty of moving furniture between floors.

[2][3][4] Trinity houses were typically located on alleys behind main streets, to be found in Philadelphia's deep blocks.

A notable concentration of trinity houses is on Elfreth's Alley, a National Historic Landmark district.

The houses have enjoyed a revival in interest as a by-product of the tiny-house movement.