"This is an old idea whose time has certainly come," he told the party's Upper South regional conference in Christchurch yesterday.
This could be reinforced by overhauling the Resource Management Act "so the current presumption that property owners must seek permission to do anything on their own land was reversed".
He repeated other party policies, including scrapping the Emissions Trading Scheme, bringing in a system of vouchers for parents to choose which school their children attend, abolishing Parliament's Maori seats and re-introducing youth pay rates.
"We'd make serious inroads into government spending, so that we don't have to keep borrowing $300 million a week, and can reduce and flatten personal and company taxes."
Dr Brash threw his weight behind freedom of speech and the right to offend people.
"That includes my right to say separatism is wrong, even if supporters of separatism are offended by my saying so.
"Let me say in passing I shall go right on saying it whether it causes offence or not. But I shall also defend to the death the right of separatists to disagree with me."
He defended former Employers and Manufacturers Association boss Alasdair Thompson's right to express an opinion, even if it was wrong.
Dr Brash said Government intervention was an impediment to freedom. "Free people are unstoppable. Together we can restore paradise."
