A Kent Conservative MP is calling for changes to planning rules to prevent developers from building multiple houses in private gardens.
Mr Clark says large back gardens are becoming a rarity
The Tunbridge Wells MP Greg Clark is asking for private gardens to no longer be defined as 'brownfield sites'.
Mr Clark's Protection of Private Gardens Bill - which he will introduce to the Commons on Wednesday - would stop gardens being developed so easily.
He said too much "precious green space" in towns and cities was under threat.
He said: "Developers buy houses as much for the garden as the house itself and then they will replace a house that is perfectly adequate... and build over the whole plot with high-density housing and flats."
Mr Clark said many developers want to provide more spacious back gardens but are forced to go back to the drawing board and make the plans more dense.
"So the loss of green space, that is very precious in our towns and cities, it is the green lungs of our towns and cities, is very serious."
Mr Clark will use the "ten-minute rule" to make a short speech urging fellow MPs to back his initiative.