It would only work on Mondays, Wednesdays and Fridays and from 8:30 a.m. to 2:30 p.m., meaning there would be significantly fewer appointments available than usual, the British embassy in Hanoi said in its official Facebook page.
Earlier the British visa application centers in Hanoi and HCMC were also allowed to resume limited operations.
Last week the Hanoi office was allowed to open all five days a week after the capital eased its lockdown.
Da Nang recorded nearly 4,900 Covid cases in the ongoing wave, but has managed to bring the outbreak under control.
The central city plans to fully reopen on October 1.
Currently 12,000 Vietnamese students are studying in the U.K., according to official statistics.
Britain lifted almost all social distancing measures and restrictions last month. Vietnam is currently on its amber list, which requires visitors to self-isolate for 10 days at home on arrival.