Tight Quarters

https://commons.wikimedia.org/wiki/File:Bishop_Rock_Lighthouse_SV8006.jpg
Image: Wikimedia Commons

The world’s smallest island with a building on it is the Bishop Rock, a skerry off the coast of Cornwall. The islet is 46 by 16 meters, and the tower’s base is 10 meters across. Before the installation of a helipad in 1976, visitors would rappel from the tower’s base to waiting boats.

https://commons.wikimedia.org/wiki/File:Thousand_Islands_single_house.jpg
Image: Wikimedia Commons

Among the Thousand Islands at the head of the Saint Lawrence River is the smallest inhabited island in the world, known as “Just Room Enough.” It accommodates a single house.

https://commons.wikimedia.org/wiki/File:Smallest_House_in_Great_Britain,_Conwy_(8035).jpg
Image: Wikimedia Commons

The “Smallest House in Great Britain” stands on the quay in Conwy, Wales. Built in the 16th century, it has a floor area of 3.05 by 1.8 meters.

https://commons.wikimedia.org/wiki/File:Drumheller,_AB,_Canada_-_panoramio.jpg
Image: Wikimedia Commons

Built in 1958, the Little Church in Drumheller, Alberta, is available for ceremonies. It seats six.