The building Hillside operates out of has an NBS rating of less than 15 per cent. The deadline for completing the seismic work expires in 2027.
It's one of 468 buildings in Wellington which need strengthening this decade. The expiry dates peak in 2027 when there are 215 deadlines.
Wellington City Council chief resilience officer Mike Mendonça said the spike of expiry dates in 2027 reflected the extensive number of earthquake-prone building notices issued 15 years earlier, along with a recent shortening of deadlines.
New legislation that came into effect in July 2017 meant some buildings in high and medium-risk areas have to be remediated in half the time because of their construction, type, use, or location.
No 241 Tinakori Rd is considered to be in an area of high seismic risk.
Owner and chef Asher Boote said the strengthening work was set to go ahead last year, but the Covid-19 outbreak delayed it.
"This is something we've known about for a long time, it's just kind of part of being in an old building in Wellington."
It's usually difficult to know exactly how long earthquake strengthening projects will take because things can change once engineers actually get to examine the bones of the building.
Boote said they would be closed for at least three months but he was prepared for six.
"It is a big unknown and that's obviously really risky in business but we've always been a pretty agile business."
While the Tinakori Rd building is closed, Hillside is opening as a pop-up restaurant at 99 Victoria St in central Wellington.
"As big of an interruption as this is going to be, and it kind of sucks because we're a busy little restaurant that's doing quite well, but given how the last year's been and what we've done in the past, we're kind of excited to shake things up- sorry about the earthquake pun", Boote said.
He is familiar with such operations after running The Ramen Shop as a pop-up restaurant for its first year in business.