The Minister also said that he would consult the Prime Minister, his Cabinet colleagues and top law officers before government files its affidavit in the apex court.
Gowda said "wider consultations" will be held with various personal law boards and other stakeholders to evolve a consensus and the process may take "some time".
He said a decision "cannot be done in a day or two. It will take its own time."
"But the concept of the Preamble of the Constitution and Article 44 and today in the national interest, certainly a step further need to be taken in this direction," he said.
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He said the high courts of Kerala and Karnataka have already given their judgment when they were dealing with some marriage laws saying a common code is the "need of the country."
"But a decision has to be taken after due consultation with various stakeholders," he said.
He said the contents of the proposed affidavit will be finalised after his consultations with the PM, his cabinet colleagues, the Attorney General and the Solicitor General.
He said while the affidavit's contents will be decided after government's internal consultations, a decision on when to implement a common code can only be taken after "wider consultations" with chairpersons of personal law boards and other stakeholders.
"There are several issues across the country today wherein people are finding something, so it will take some time.