noun
housewarming gift; housewarming party
Refers to both the celebration of a new home and the gift given on that occasion. Often used in the phrase 新築祝いを贈る (give a housewarming gift).
友達の新築祝いに観葉植物を贈った。
I gave a houseplant as a housewarming gift to my friend.
来週、新築祝
We're planning to have a housewarming party next week.