Disputes have broken out at a number of housing associations across London. At some, contractors competing for council business move support workers from firm to firm, making sweeping changes to working hours and methods.
Others say they do not have to follow Tupe regulations that protect transferred workers.
Some employers are pushing workers to work 37.5 hours a week instead of 35 hours.
Yet some senior managers are getting huge pay rises as housing associations remake themselves on corporate lines.
Meanwhile some 220 workers at Notting Hill Housing Trust in the Unison union are balloting for strikes.
They are fighting imposed cuts to flexitime and carers' leave, reduced salary protection following reorganisation, and cuts to relocation expenses.
The workers voted by 95 percent for action in a consultative ballot. The result of the formal strike ballot is due on Friday of this week.