Older people at the massive Kidbrooke Village development have had all the parking around their sheltered housing removed.
Tenants at the Halton Court part of the site - formerly the Ferrier Estate but now undergoing a £1bn regeneration by developer Berkeley Homes - discovered last week that double yellow lines had been painted all around their blocks.
They complain that Blue Badge holders are being hit with fines and elderly people can no longer be picked up by their carers because private contractors are ruthlessly enforcing the new regulations.
Meanwhile, they say, those who bought their own private properties on the estate can park without fuss.
Deborah Josiah, 45, cares for her 76-year-old dad John, who has dementia, at Halton Court - which has 170 apartments for over-55s.
She said: "We've got to park two streets away now. My dad can't come out of that building on his own and to him it'll now be a 15 minute walk to get to my car.
"It seems like Berkeley are saving all the parking spaces for the people that have bought their own properties."
Residents plan to meet with Berkeley Homes and start a petition against the changes which, they say, are not being explained with signs and have even stopped doctors on house visits getting inside.
Ms Josiah said: "What was the point of building this place, putting it in the middle of nowhere, if people can't get out?
"What will happen when the rest is built? It will get worse."
Chairman, Berkeley Homes John Anderson said his firm was "committed to promoting the use of sustainable forms of transport" at Kidbrooke.
He said: "The car parking provisions at Kidbrooke Village are provided in consultation with the Local Authority and Transport for London.
As developers, we work to the rules set out in current planning guidelines, including pre-determined controlled parking zones as set by the parking services team.
"Special provisions are given to Blue Badge holders, who are exempt from certain parking restrictions, in line with government regulations."
- A consultation is now underway over revised plans for Kidbrooke Village - including a 30-storey tower near the station. Visit kidbrookeregenerationinfo.info