Measures to deter people from visiting protected heathland in Surrey have been brought in to protect birds.
Nightjars, woodlarks and Dartford warblers are found on the heaths
Waverley council wants people to visit Farnham Park and not the Thames Basin Heaths, which are north of Farnham.
"No matter how considerate individuals are, their overall presence affects the birds," spokesman Steve Thwaites said.
Housing developers must ensure increasing the town's population does not lead to more people using the projected heathland.
Mr Thwaites said: "Even though the heaths are outside Farnham, people living in Farnham use them for recreation and walking their dogs."
Woodlarks and warblers
He said improvements were under way at Farnham Park, such as providing increased parking and more signs, so people go there instead.
The council has produced guidance for developers on how to incorporate the Farnham plan into their planning applications.
Forty thousand homes are planned in Surrey, Hampshire and Berkshire, near the Thames Basin Heaths over 20 years.
Earlier this year, the RSPB said it wanted to see planning authorities do more to protect the rare heathland birds.
The charity said the heaths were home to rare bird species including the Dartford warbler, nightjar and woodlark.
The building plans cover the commuter towns of Guildford and Woking in Surrey, Bracknell in Berkshire, and Farnborough and Aldershot in Hampshire.