new-built? or newly-built ? or both are O.K? What's the difference?
‘Built’ is the past participle form of the verb build and is used as a modifier to describe a specified physical build/consruction:
She is a slightly built woman.
He is a tall and well-built person
Now see the difference. In the first sentence the adjective built is modified by the adverb ‘slightly’. Whereas in the second sentence ‘well-built’ is a single unit functioning as adjective.
Similarly, you can say;
This is a newly built house.
These new-built structures have come up recently.
So when you use an adverb the words are separate and that is the rule but when used as a single unit modifier with another word a hyphen(-) is used. It is a practice to use a hyphen between words combined to form a unit modifier that precedes the word modified. This applies particularly to combinations in which one element is a present or past participle. You have a lot of examples of this type of single unit modifiers such as: well-adjusted, well-advised, in-built, new-planted etc
The valleylooks green with new-planted crops.
a new-built house
a newly built house
The difference is one of dialect. The phrase a new-built house is British English.
new from Old English of-niowe, Middle English, anew; a new-built house means a house built anew, a newly built house.