Speaking to the Campaign to Protect Rural England (CPRE) last week, Nick Clegg also stressed the need to map UK biodiversity, ditch centralised housing targets and allow more local say in big infrastructure projects.
"The only way to get more affordable homes delivered is to give more power to the people who know best - local people," Clegg argued.
CPRE chief executive Shaun Spiers said: "There remains a pressing need for more rural affordable homes. We must take this opportunity to build a sustainable approach to meeting the nation's housing needs."
Clegg added that the party's natural environment working group is carrying out a study of greenfield land that will be unveiled at its conference next autumn.