Gatehouse n. : A house connected or associated with a gate.

Example:
Is The Gatehouse a good place to have a wedding and reception?

Taxonomy
gatehouse, Gatehouse of Fleet, castle, manor house, free encyclopedia, loops, mansion, stones, logis, châtelet, manor, 14th century, 15th century, Morbihan, French wikipedia, southern entrance, York, Micklegate.

Defination from the web:
gatehouse in Ille-et-Vilaine, Brittany (see French wikipedia page, Château de Vitré) ... Latrobe Gate, a Greek Revival and Italianate gatehouse built in 1806, Washington, D.C. ...