He said the Barker review suggests minor commercial developments should not require planning permission, and that where permission is needed it should be quicker and easier for businesses to apply.
Mr Miliband said he will have 'more to say about this' in a speech to the Campaign for the Protection of Rural England on 12 March.
The future of farming is 'more about environmental security than food security', he told the Oxford farming conference yesterday.
'Land use needs to marry economic, social and environmental value; it needs to adapt to demographic and economic pressures while increasing biodiversity and wildlife; enhancing beauty and access; and maintaining flood protection, carbon sinks and other eco-system services.'
Housing, planning & environment