Simon Cowell has spent around £500,000 on a panic room and other personal security following the raid on his west London home.
In December 2015, the music mogul was asleep at the £35million property with his partner Lauren Silverman and their son Eric when burglar Darren February broke in through a patio door.
The 33-year-old, who was jailed for eight years at Isleworth Crown Court after being found guilty of burglary last month, stole almost £1 million worth of jewellery, including watches, a ring and earrings.
In order to safeguard against any possible future incidents, the X Factor boss has forked out to overhaul security in the property.
"I've obviously had to massively increase my personal security at home with every mod con you can imagine, and all this stuff, including a panic room," the 57-year-old shared.
"My house basically looks like something out of Raiders of the Lost Ark."
He added to the Mail: "We called in these guys and one of the things they suggested was a baseball bat. I'm not even joking."
Simon said the thing that scared him the most was that the burglar "was walking about in my house when Eric was fast asleep - it doesn't bear thinking about what could have happened if he had goone into his bedroom, and found him. It is terrifying and still gives me nightmares."
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In a victim impact statement read to the court last month, Simon said he was deeply worried about his family's personal security.
He said: "This incident has caused me great concerns about the security of my family. On reflection I am very scared of what could have happened to my son if the burglar had gone into his room.
"I could not bear to think of the consequences and also a lot would have happened if the burglar had come into our room.
"The whole incident has been very traumatic and there is a constant fear that it may be repeated and that it may be worse next time."