The company board has approved a plan to build the plant at the Hoa Lac High-tech Park in the capital to produce LED lighting and electronics products.
It will use its own funds and bank credit.
Rang Dong has not revealed the losses caused by the fire though its chairman, Nguyen Doan Thang, estimated them at VND150 billion ($6.47 million).
The company has stepped up production to make up for the destroyed stocks.
The company reported after-tax profit of VND160 billion ($6.9 million) in the first nine months, up 20 percent year-on-year.
The five-hour blaze, caused by a short circuit, on August 28 destroyed a third of the stocks at the warehouse in Thanh Xuan District, releasing an estimated 15.2-27.2 kilograms of mercury into the environment, which forced residents in the area to evacuate. But health officials said no mercury poisoning has been detected in 1,000 people who were checked.
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With U.S.-China trade spat showing no sign of ending soon, experts say it is time for Vietnam to take preventive action.
Sexual abuse of children is far more prevalent than thought, and Vietnamese citizens want strong counter measures as soon as possible.
Meeting seniors abandoned by their families, Hong opened her home to those in dire need.
The joint statement said Heard "will be donating financial proceeds from the divorce to a charity".