Ewell councillor Clive Woodbridge, chairman of the residents’ association group of councillors, said there will be an "inevitable impact" on the borough if suggestions put forward by business leaders - are accepted by the Mayor of London.
The proposals, outlined by business group London First earlier this month, call for tens of thousands of new homes to be built on greenbelt land within London.
The new suburb would be served by train expansion through the planned Crossrail 2 scheme, the group said.
Coun Woodbridge said: "It’s almost like having a new town in Chessington and it will inevitably have a big impact on Epsom and Ewell on the border.
"Chessington residents will go to schools in Epsom and Ewell and Epsom Hospital is the nearest hospital."
"We need to start a dialogue as Surrey with London to make sure our views are taken into account. We need to look at how we can engage with London so it’s not just a London plan, a fait accompli.
"The approach should be as Surrey, not just as individual boroughs."
David Leam, London First Infrastructure director, said: “Our report was setting out, for illustrative purposes only, the additional property value that would be created by a substantial new housing development of up to 70,000 homes.
“The actual number of new homes that could be built should be explored by local boroughs and the Mayor.”
Edward Davey, MP for Kingston and Surbiton, started a Facebook group this week which calls on residents to: "Say no to 70,000 homes in Chessington".
Kingston Council leader Liz Green said: "We call on Boris [Johnson] to reject the recommendations that suggest building on our green belt."