Fast route
Do this in order
- Step 1
Purchase every house expansion in order; decorative furniture does not count as an upgrade.
- Step 2
Finish any required construction wait after each purchase.
- Step 3
Enter the fully expanded house after the final upgrade and sleep once if the completion state does not register immediately.
Prepare before you start
Keep spare materials, coins and one free inventory row. For cumulative goals, use the collection or status menus instead of guessing from a single night.