Questions & Answers about Det er huset, der ligger overfor stationen.
This is a very common Danish pattern called a cleft sentence.
- Det er huset ... literally looks like It is the house ...
- It is used to identify or emphasize something.
- In natural English, it often corresponds to It is the house that ...
Here, det does not refer to a specific thing. It is a dummy subject, just like it in English sentences such as It is John who called.
So the structure is:
- Det er X, der ...
- It is X that/who ...
Because Danish marks the at the end of the noun.
- et hus = a house
- huset = the house
The noun hus is a neuter noun, so its indefinite article is et. When it becomes definite, it takes -et:
- et hus → huset
So huset means the house.