But according to the Merriam Webster and Oxford dictionaries and The Chicago Manual of Style, the correct spelling — no matter how you use it in a sentence — is on-site. We are waiting for the on-site inspection. The meeting will be held on-site.

Is onsite one word or two words?

Merriam-Webster (US) does not recognise “onsite” as a word; same goes for the Macquarie Dictionary here in Australia. So it's either on-site or on site. Q: How can you tell which one? A: You'd typically use the hyphen version, “on-site”, when it's being used as an adjective or adverb before a noun.

Is on site always hyphenated?

Right now, nearly every dictionary says “off-site” and “on-site” take hyphens. ... All the dictionaries are unanimous that both words are only adjectives (“We are having an off-site meeting”) or adverbs (“We are having a meeting on-site”). In other words, you can't have an “off-site” without another noun coming along.