Some buildings would have had glass windows. Among the wealthy, it was common for women to have their own 'apartment' called a grianan (anglicized "greenan") in the sunniest part of the homestead.
Some structures might have included glass panes. For prosperous families, it was common for women to reside in an apartment known as a grianan (anglicized "greenan"), usually situated in the sunniest area of the dwelling.