In Genesis 35:18, Benjamin signifies the quality of the spiritual of the celestial, intermediate between the spiritual and the celestial. (Arcana Coelestia 4592, 5469)

In Revelation 7:8, Deuteronomy 33:12, Benjamin signifies the Word in its lowermost sense, which is natural. (Apocalypse Explained 449[10])

In Genesis 35:18, Benjamin (as Benoni) signifies a state of temptation, one of mourning. (Arcana Coelestia 4591)

In Jeremiah 6:1, Benjamin signifies people who have conjunction with the Lord in the lowest heaven. (The Inner Meaning of the Prophets and Psalms 72)

Benjamin, as the beloved of the Lord, signifies spiritual truth from celestial good. (Arcana Coelestia 4592[7])

(References: Apocalypse Explained 449)

A "house" is essentially a container -- for a person, a family, several families or even a large group with shared interests (think of the term "houses of worship.") In the Bible, a "house" is also a container, but for spiritual things rather than natural things. In various uses a "house" can represent part of the mind, the whole mind, a whole person or even a church. The other nuance to the word "house" is that it is generally used in regards to our affections and desires rather than our thoughts and principles. This makes sense; we tend to engage our thoughts and rationality when we are out in the world doing our work, but when we are inside our houses we are driven most by love for our families and the desire to be good to those we love. So "house" tends to represent the things we want and care about -- which are ultimately the things that define us.