A couple who lost their toddler son in a house fire has trashed the luxury Gold Coast home Clive Palmer rented for them in the wake of the tragedy.

It could potentially leave the billionaire mining magnate with a repair bill as high as $100,000.

Jaryd Campbell and Belinda Warwick prompted a nationwide outpouring of sympathy when they lost their two-year-old son Roman and all their possessions in a house fire in Beenleigh, south of Brisbane, in May.

Among the many people touched by the couple's plight was Mr Palmer, who subsequently paid $1000 a week to rent the couple a luxury Gold Coast home to house them and their remaining four children for six months.