The “altars” of this verse seem to be the same as those of 2 Kings 21:5, and consequently were not in the temple building, but in the o…

He built altars — that is, idolatrous altars (2 Kings 21:5).

In the house of the Lord — that i…

And he built altars in the house of the Lord
In the holy place, as distinct from the courts in the next verse; and t…