A burdei, or bordei (Ukrainian: бурдей, бурдій, Romanian: bordei) is a type of half-dugout shelter, somewhat between a sod house and a log cabin. This style is native to the Carpathian Mountains and forest steppes of eastern Europe.

In the Cucuteni Tripolie Culture the bordei houses were characterized by elliptical shapes. These houses would typically have a wooden floor that was about 1.5 meters (5 feet) below ground, which would place the roof at just above ground level.

The term used by western historians, for bordei-type housing on the Lower Danube and in the Carpathians during the 6th–7th centuries AD, is Grubenhaus. Poluzemlianki is used by Russian researchers. The Russian term refers to a structure partially dug into the ground , often less than 1 m deep. The Grubenhaus was erected over a rectangular pit, ranging in size from four square meters to twenty-five square meters of floor area. During the 6th and 7th centuries the sunken buildings east and south of the Carpathians, were under 15 square meters in floor surface. The experiments of the Archeological Open-Air Museum in Březno near Louny have reconstructed the living and temperature conditions in the dug houses.