A man from Sudbury has pleaded guilty to starting a fire in Great Cornard which allegedly caused £40,000 worth of damage.
Shaun Du’Barry Spinks, of Hawkins Road, appeared on Thursday at Ipswich Crown Court.
Also in court was a 17-year-old girl, who cannot be named for legal reasons, who pleaded guilty to the same offence.
Both had previously denied committing arson with intent or recklessly as to whether life was endangered at a property in Queensway, Great Cornard on January 12 last year.
Judge David Goodin was told that the two defendants had now changed their plea to guilty. Du’Barry Spinks has no previous convictions, his barrister Andrew Thompson told the court.
Appearing for the 17-year-old girl, Sarah-Kate McIntyre said her client had history of mental health issues and had been aged 16 when the offence was committed.
The fire caused extensive damage to a first floor flat, forcing the occupants to move out.
The court heard that a third defendant accused of the same offence, Abigail Bolden, 20, of Kersey Avenue, Great Cornard, had pleaded not guilty.
Bolden is due to stand trial in May. The trial is expected to last for three days.
Judge Goodin ordered the preparation of pre-sentence reports by the probation service on Du’Barry Spinks and the 17-year-old girl who will be sentenced at the conclusion of Bolden’s trial.
All three defendants will remain on bail until their next court appearance.