The company operating hotels part-owned by actor Neil Morrissey promises to "manage the situation" after being granted 24-hour drink licences.
All-day drinking was granted for people staying at Browns Hotel in Laugharne, a favourite haunt of poet Dylan Thomas, and at the Hurst House Hotel.
Three objections had been made from residents complaining of anti-social behaviour by Browns' customers.
But Carmarthenshire Council granted the licences with conditions.
The council's licensing sub-committee took note of written complaints from three Laugharne residents, who did not attend the meeting, about noise and rowdiness after customers left.
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I give my word as a local resident that we will manage that site as professionally as we can
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Four of the 14 pubs and clubs in Wales to have been granted 24-hour licensing Wales are in Carmarthenshire.
The company running Browns - Hurst House Farms - accepted conditions imposed including that music played inside should not be heard outside and that notices are put up telling regulars to leave quietly.
In her letter of objection Laugharne resident Susan Edge said the pub had changed since Mr Morrissey, star of the BBC sitcom Carrie and Barry, bought it 18 months ago.
"Since it changed hands Browns has gone from a well-run orderly quiet country pub to one that attracts a yobbish element," she wrote.
"Most weekends have been a misery for me with loud music erupting through the open bar windows.
Neil Morrissey part owns two pubs and a hotel in the village
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"Youths and girls vomit or urinate outside my house and there is general mayhem at closing time.
"Customers either shout abuse or scream at each other, there are noisy cars with thumping radios and I have to seek refuge in my bathroom to escape the misery.
However, councillors granted Browns a 24-hour licence for residents and guests only. Drinking for people not staying at the hotel is allowed to midnight Sunday to Thursday and 0100 GMT Friday and Saturday.
Police licensing officer Constable Mike Price withdrew proposed conditions that the premises must have CCTV and a night-time door supervisor.
Similar extensions were granted for Hurst House Hotel.
Stephen Watson, managing director of Hurst House Farms said he "sympathised" with the residents and "took their views very seriously."
The licence application was about flexibility and essentially about residential business, he said.
"At the moment Browns is only open on a Friday and Saturday. It is in a state of some disrepair. My company is commited to a renovation programme.
"I am a resident of Laugharne. I give my word as a local resident that we will manage that site as professionally as we can."
A 24-hour residents' drinks licence has already been granted for the New Three Mariners Hotel owned by the same company.