The stronger-than expected rebound was mainly driven by higher household spending and soaring exports, the office said.
“This enabled the German economy to make up for a large part of the massive decline in gross domestic product caused by the coronavirus pandemic in the second quarter of 2020,” it added.
The reading marked an upward revision to an earlier flash estimate of 8.2 percent growth, and followed a 9.8 percent plunge in the second quarter.
The outlook is clouded by a second wave of coronavirus infections and a partial lockdown to slow the spread of the disease. Restaurants, bars, hotels and entertainment venues have been closed since Nov. 2, but shops and schools remain open.
Chancellor Angela Merkel and regional state premiers are planning to extend the “lockdown-light” on Wednesday until Dec. 20, according to a draft prepared for their meeting.
A contraction in the service sector is expected to weigh heavily on gross domestic product in the fourth quarter, while lockdown measures in other countries are likely to hit export-oriented manufacturers as well.
DIW economist Claus Michelsen said a decline in economic output was therefore on the cards, with initial estimates indicating a GDP drop of around 1 percent in the final quarter.
“Germany and many important trading partners are likely to slide back into recession,” Michelsen said.