Question

What kind os phrase is "to the front door"?

Answer 1

The phrase "to the front door" is a fragment, but more importantly, it is a prepositional phrase. Any phrase without a subject or verb that begins with the attached list is called a prepositional phrase, and they can be either adjectival (defining a noun) or adverbial (describing a verb, an adjective, or another adverb).
Hope that helped! =)