From Middle English hous, hus, from Old English hūs ("dwelling, shelter, house"), from Proto-Germanic *hūsą (compare Scots hoose, West Frisian hûs, Dutch huis, German Haus, German Low German Huus, Danish hus, Faroese hús, Icelandic hús, Norwegian Bokmål hus, Norwegian Nynorsk hus and Swedish hus), possibly from Proto-Indo-European *(s)kews-, from *(s)kewH-. Eclipsed non-native Middle English meson, measoun, borrowed from Old French maison. More at hose.
The uncommon plural form housen is from Middle English husen, housen. (The Old English nominative plural was simply hūs.)
From Middle English housen, from Old English hūsian, from Proto-Germanic *hūsōną, from the noun (see above). Compare Dutch huizen, German Low German husen, German hausen, Norwegian Nynorsk husa, Faroese húsa, Icelandic húsa.