In terms of total surface, Sanjūsangen-dō, photographed here, comes quite close to the largest wooden structure in the world, which is the Daibutsuden of Todaiji, in Nara, which has a length of 57 meters and a width of 50 meters.
EXIF info:
Nikon D700
Lens: 14mm F/2.8D
Focal Length: 14mm
Aperture: F/7.1
Shutter Speed: 1/200s
ISO Sensitivity: ISO 320