From Longman Dictionary of Contemporary Englishguardhouseguard‧house /ˈɡɑːdhaʊs $ ˈɡɑːrd-/ noun [countable] PMTBBa building for soldiers who are guarding the entrance to a military camp
Examples from the Corpus
guardhouse• There were turrets at the corners and a guardhouse over the entrance.• Only the locked gate and guardhouse bespeak anything more uncommon inside.• They were halted at the outer guardhouse at the aforementioned trench, to identify themselves.• We put on our képis, straightened our ties, pulled our fingers into regulation gloves and set off for the guardhouse.• He conducted the matter in his pyjamas, and wanted to shove Hauptmann Horn in the guardhouse for the night.• In front of the guardhouse, a sentry was marching up and down.• Captain Kennington tried to lift Crazy Horse by the shoulders and return him to the guardhouse. 