A teenager who set fire to a million pound home has been given one last chance to get his life back on track.
Gamnel Farm in Tring was for sale when it went up in flames during January this year.
Hemel Hempstead magistrates heard how the plush property became a hang out for youths after they somehow acquired a key.
The owners had already moved out of the home in Bulbourne Road.
On the afternoon of Wednesday, January 28, a group of teenagers were inside the house where they were setting fire to the spray from an aerosol can.
One of the youths - a 16 year old boy from Tring who cannot be named for legal reasons - accidentally set alight to a bedroom curtain.
He appeared at Hemel Hempstead Magistrates Court for sentencing on Wednesday, May 27 after earlier pleading guilty to arson.
Four teenagers in total were arrested by police but no further action was taken against three.
A supervision order for 24 months was imposed on the boy along with an intensive supervision and surveillance programme, which includes work with probation officers.
A curfew for 90 days was also given, which means the teen will be fitted with a tag and must be at home between 8.30pm and 6am.
Magistrate Michele Reeves told him: "Should you fail in this programme you will be brought back to court and if that happens you will have to make sure your bags are packed because there will be no alternative but to send you to detention."
She added: "This is your last chance."
The boy, who is now working during the evenings helping with a cleaning job, was ordered to pay 45 in court costs. A three month parenting order was imposed on the family.
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