Incorrect spelling, explanation: build-in is incorrect because the -in part makes it an adjective, and to obtain an adjective meaning from a verb we need its past participle form – in this case, built (hence built-in). Therefore built-in is the correct spelling here.
Correct spelling, explanation: as an adjective meaning, verbs need to be in part participle form, therefore built-in is the correct form. Built is the past participle form of build. For the same reason, build-in is incorrect. There is such a word as build, but we need a third form of the verb for it to make an adjective, thus built-in is the only option.
Definition of built-in:
adjective, being an integral part of a structure, building, object, etc.
A built-in swimming pool sounds a little luxurious.
-Where is the wardrobe? – Oh, it’s there, it’s a built-in wardrobe.
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Thank you. I cannot believe how often I see the word build-in, even from programmers, engineers. I even see this from technical ESL people where everything is spelled correctly, exactingly phrased except they they keep using the word _build-in_ instead of _built-in_.