YOU SAID:

the fire is spreading to the house

INTO JAPANESE

家に火が広がっている

BACK INTO ENGLISH

There's a fire spreading in the house.

INTO JAPANESE

家の中に火が広がっている。

BACK INTO ENGLISH

There is a fire spreading throughout the house.

INTO JAPANESE

家全体に火が広がっている。

BACK INTO ENGLISH

There is a fire spreading throughout the house.