Paul uses the conditional clause, "if our earthly house ... were dissolved," because he knows that Christ could return soon, in which case he would not experience death; rather, his body would be immediately transformed.
The "building of God, a house not made with hands, eternal in the heavens" likely refers either to a temporary body prepared for the believer in heaven while he awaits his resurrection body, or to the environment of the heavenly existence.
Take a moment to listen to today's reading followed by its commentary of 2 Corinthians 5:1—10.
Blessings,
Presiding Elder Barbara Hayes
FLSB NKJV