Achtermannsches Haus, Heritage building in Brunswick, Germany.

The Achtermannsches Haus at Reichsstraße 3 is a patrician house with two massive lower storeys and a jettied upper storey, rebuilt in stone after 1944. Its portal carries figures of strength, temperance, love, hope and faith, the Achtermann-von Strombeck double coat of arms, and builder Ulrich Stamm's mason's mark and the date in the bay-window architrave.

The house was built between 1626 and 1630 during the Thirty Years War for mayor Georg Achtermann, reflecting the family's wealth despite that turbulent period. After suffering damage in 1944, the structure was carefully reconstructed between 1947 and 1949.

The building displays the coat of arms of the Achtermann-von-Strombeck family above its entrance, alongside the master builder's mark in an iron anchor. These signs reflect the craftsmanship and standing of the family within the city.

The building stands within walking distance of the Martini Church in the city center and serves as an administrative office today. Visitors can view the impressive facade from the street and take time to examine the fine stonemasonry work.

On the right side above the portal, Ulrich Stamm left his mark in an iron anchor, the symbol of Brunswick's Neustadt. His full name, stonemason's mark and the construction year are also cut into the stone architrave of the bay window.