Wasserschloss Speicherstadt Hamburg, Neo-Gothic building in Speicherstadt, Hamburg

The Wasserschloss is a four-storey brick building on a peninsula between the Wandrahmsfleet and Holländischbrookfleet. Its street facade has tall pointed-arch windows, a round bay and a green copper roof; the water side carries the single tower, a small clock turret with a pointed copper spire. A low brick annex with steps down to the water projects from the rear.

The Wasserschloss was built between 1905 and 1907 as part of the third construction phase of the Speicherstadt, which ran from 1899 to 1912. It housed and served as workshop for the Windenwärter, the men who maintained and repaired the hydraulic winches used to hoist goods up the warehouse facades, since the warehouses had no freight lifts. Heavy spare parts left the building by road through its large double doors and by water via two cranes on the east side. It has been a listed monument since 1991.

The name Wasserschloss means "water castle", though the building never was one; its size earned it the nickname Wasserschlösschen. The ground floor now holds a tea trading business with a tasting café, and a small café with an open terrace faces the water on the other side. The building is also an external wedding venue of the Hamburg-Mitte registry office.

The building stands on a narrow peninsula at the junction of Wandrahmsfleet and Holländischbrookfleet, address Dienerreihe 4; the nearest U-Bahn station is Meßberg. The tea shop and its tasting room occupy the ground floor, and a small café sits on an open terrace on the water side. The low annex at water level, with steps down to the canal, was built after the war from rubble.

The low annex at the water side was not part of the original building: it was added in the interwar period and built from rubble that lay around the harbour, in what is now HafenCity. It has a gabled roof and an industrial chimney.