Both sides in the case - defence and prosecution - have one month to appeal against the sentence as being either too long or too short.
Aldhouse fatally stabbed Mr Longfellow outside the victim’s Rawai home on August 14, 2010, after the two had been involved in a punch-up in a bar, which Aldhouse lost.
After the murder Aldhouse fled the country to his native England, where he was arrested on an outstanding warrant.
Thailand applied for his extradition which, after more than two years of hearings and appeal, was granted by a British court, on condition that Aldhouse would not face the death penalty.
He arrived back in Phuket on December 1 last year.
Initially, Aldhouse denied murdering Mr Longfellow but at a hearing on August 28, he changed his plea to guilty, and apologised to Mr Longfellow’s family.
This allowed the judge in the case to apply the standard halving of sentence for those who are believed to genuinely enter a plea of “guilty”.
In this case, the life sentence Aldhouse was facing was reduced to 25 years.
Aldhouse's lawyer Kampon Siriwatanyoo said that there were no plans at the moment to appeal against the sentence or to make a court bid to allow him to serve out his sentence in the UK.
"He says he has plenty of things to do in the prison here," the lawyer said.