As the finance industry prepares for life post-pandemic, commercial banks are moving quickly to harness working from home to cut costs, while investment banks are keen to get traders and advisers back to the office.
HSBC and Lloyds are getting rid of as much as 40% of their office space as an easy way to make savings when bank profits have been crunched by the pandemic.
But there are concerns that remote working does not benefit everyone. Junior staff miss out on socialising and learning opportunities and there are also risks home working can entrench gender inequality.
At investment banks, where long hours in the office were the norm pre-pandemic, bosses say they want most people back where they can see them.
HSBC plans to almost halve office space globally, as it aims to squeeze more use out of the remaining space and increase the number of staff per desk from just over one to closer to two.
Britain's biggest domestic lender Lloyds plans to shrink its office space by a fifth within three years. Standard Chartered will cut a third of its space within four years, while Metro Bank said it would cut some 40% and make more use of branches.
"We've had a period where flexible working has been tested in full, with about three quarters of people not based in offices as we used to call them, and the business has performed remarkably well," Andy Halford, Standard Chartered CFO, said.
But major investment banks take a different view, with Goldman Sachs Chief Executive David Solomon pouring cold water on the potential of remote working.
"It's not a new normal. It's an aberration that we're going to correct as soon as possible," he told a Credit Suisse conference on Wednesday.
Barclays CEO Jes Staley, who last year said he thought the days of 7,000 employees trudging into its Canary Wharf headquarters were numbered, is also unwilling to commit for now to large office closures.
The Barclays boss has said the bank had "no plan" to make a major real estate move as Britain's prolonged third lockdown had shown the strains of working from home.
Nick Fahy, CEO of online lender Cynergy Bank, said working over screens often could not compete. "You might have a disagreement on this, that or the other but actually over the coffee machine or over a glass of wine or a bit of lunch, issues can be resolved."
Some banks have acted quickly because they are used to flexing workforces in line with economic cycles, particularly in investment banks, Oliver Wyman principal Jessica Marlborough said.
But some are waiting on analysis of staff productivity changes before making final decisions, while others were mindful junior staff may still prefer going into offices, she said.
Banks are also concerned women may lose out from the shift to remote working.
"We thought the pandemic would be a big leveller for women. But actually what we're starting to see is it's extremely challenging to get women to move jobs in a pandemic," Marlborough said.
"Banks were making progress in hiring a more balanced workforce in terms of gender and other metrics, but they're actually struggling now (as banks are finding) they (women) are less likely to seek out a new job."
Union leaders said part of the reason was that some women are juggling more childcare responsibilities during the pandemic.
Dominic Hook, national officer for UK union Unite, said banks must ensure working from home is voluntary, use of surveillance tools is limited, and employers respect staff hours so work does not spill into evenings and weekends.
"Our concern is that it won't actually be a choice and that banks will pressure staff to work from home," Hook said.
There are also concerns hybrid working will favour employees who visit the office more regularly, as they can spend more time in person with colleagues and managers, said Richard Benson, managing director at Accenture Interactive.
The staff most likely to go back to the office are traders, bank executives said, while back-office functions such as finance, risk management and IT will spend more time working remotely.
In Germany, Deutsche Bank said it had been challenging to adapt home office spaces for traders and expected many will want to return, but not all.
"We will pay more attention to the personal circumstances at home. Dealers also have children or parents in need of care. We have become more sensitive," said Kristian Snellman, Deutsche Bank's head of investment banking transformation for Germany and EMEA.
The trend to shed offices predated the pandemic as many banks made cuts after the 2007-09 financial crisis. Some have already made moves as a result of the pandemic, such as NatWest, which shut its tech hub in north London last summer.
Retained offices are being remodelled, with desks removed to make way for collaboration and break space such as coffee areas, gardens and libraries, property consultancy Arcadis said.
"It's not just about adding a ping pong table and table football and hoping it will work, it's about making sure people get downtime," said Sarah-Jane Osborne, head of workscape at Arcadis.
David Duffy, CEO of Virgin Money, said the bank is among those planning to strip out office cubicles.
"The world of large-scale populations returning to a tall skyscraper building to come in and do their e-mail in the office doesn't make any sense," he said.