East Sussex Fire and Rescue Service has confirmed the fire at the warehouse in Portslade is not treated as suspicious.
Investigations are still ongoing.
The site was handed back to its owners at the weekend.
The devastating fire ripped through a warehouse that belonged to Chandlers Building Supplies last Thursday at around 8.44am.
The big blaze burnt down one warehouse and damaged another two.
Firefighters worked through the weekend to damp down the flames. The warehouse had to be demolished due to the severe damage.
Read here for our coverage of the inferno.
Brighton and Hove City Council assisted fire service and Sussex Police during the fire.
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