A senior magistrate issued the order against the 18 charged with breaching building laws in the lead up to the Rana Plaza compound's implosion in 2013, one of the world's worst industrial disasters.
No one has yet been convicted over the tragedy which highlighted appalling safety in Bangladesh's USD 27 billion garment export industry, the world's second largest after China.
Thirteen of the accused, including owners of the building and those of factories housed inside, appeared in court to seek their release from jail, saying they were not guilty.
All 18 face seven years in jail if convicted of the charges.
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The court has heard how the Rana Plaza owners allegedly violated building codes and illegally extended the nine-storey complex which was initially approved as a six-storey shopping mall.
Owner Sohel Rana, who has been in jail since 2013, and others also face separate murder and corruption trials over the disaster, although neither hearings have started yet.
Rana's parents, who jointly owned the building with him, and the mayor of the town of Savar where it was located, are also charged with breaching building laws.
The mayor and other officials are accused of falsifying documents to approve the extensions, while factory owners are charged with illegally installing heavy equipment including generators in the building.
At least 1,138 people are known to have died in the tragedy. Rescue workers struggled for weeks to retrieve the bodies from the ruins but some people are still unaccounted for.
A host of Western retailers had clothing made at the factories housed at Rana Plaza, including Italy's Benetton, Spain's Mango and the British low-cost chain Primark.