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The phrase 'in the house' is a prepositional phrase in form, and since it answers the question Where?, it functions as an adverb. Adverbs of Place occur with linking verbs.
It looks like a linking verb can also have a adverb after the linking verb but before a adjective as shown below:
The flower smells very nice.
determiner+noun+linking verb+adverb+adjective
There seems to be only 1 difference in structure between the linking verb and the non-linking verb. A linking verb allows a adjective to occur after it and the non-linking verb does not.
Is "very" a degree adverb or a frequency adverb or both?
structure of linking verbs 
Linear Mode
