'newly-built' originates from the combination of 'newly' and 'built', where 'newly' is derived from 'new', meaning 'recently', and 'built' is the past participle of 'build', meaning 'to construct'.

'newly' changed from the Old English word 'niwe' and 'built' from the Old English 'byldan', eventually forming the modern English term 'newly-built'.

Initially, 'newly-built' meant 'recently constructed', and this meaning has largely remained the same in modern usage.