In [STRIKE]this[/STRIKE] the sentence "This house is built of stone", is 'built' an adjective or a verb?
See my changes to your layout above.
What do you think the answer is?
"Built" is not the present simple.
In your sentence "built" is the past participle of the verb "to build", so it's not an adjective. You used the auxiliar verb to be + the past participle of the verb to build.
See the difference: He has a heavy build (he is burly, husky). In this sentence, build is an adjective.
We ate baked peas (adjective). The peas were baked too long (verb, passive voice). Do you understand the difference?
a dancer who is really built
He has a heavy build (he is burly, husky). In this sentence, build is an adjective.
Past participles are frequently used as adjectives in English. Indeed, we often forget that some adjectives, such as tired, bored, interested, were originally past participles - and can still be used as such.
In 'This house is built of stone', the italicised words are telling us about the appearance and structure of the house.