House
The 'house' in this chapter refers to both a physical temple that David desires to build for God and the dynastic house or lineage that God promises to establish for David.
The concept of 'house' underscores God's covenant faithfulness and His sovereign plan to establish an everlasting kingdom through David's lineage, ultimately fulfilled in Jesus Christ.
In ancient Israel, a 'house' could refer to a physical dwelling or a dynasty. The promise of a lasting dynasty was a significant assurance of God's favor and blessing.