집(jip)
The common, everyday word for 'house' or 'home'
When to use
Talking about own house, Visiting a friend's house, Everyday conversation
The nuance
Used in everyday conversation or writing when referring to one's own house or the house of someone familiar. It is not honorific and can be freely used by anyone.
댁(daek)
An honorific term used to respectfully refer to someone else's or a third party's house
When to use
Polite conversation, Referring to listener's house, Formal occasions
The nuance
Used in polite or formal contexts to respectfully refer to someone else's or a third party's house. Not used for one's own house, mainly in official or courteous situations.