Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 3 years ago

Bismihi ta'ala

No, it is not necessary or wajib, unless one had made a vow that should they purchase a new house they will sacrifice an animal.

Otherwise, they do not need to. Of course, it is highly recommended to show gratitude to Allah ta'ala, and thankfulness, and to repel envy or evil eye, by organising a banquet (waleemah), and by sacrificing an animal and feeding people. It does not need to be a goat, but any halal animal. 

And Allah knows best