The government has been considering alternatives to its plans for reforming planning gain after protests over its proposed planning gain supplement.
Cooper said: "There are different ways of capturing the uplift in value and we will make a statement this afternoon."
She hinted that the government still supported reforms to the current 106 agreement system.
She said: "What we are clear about is we need to raise additional finance for planning gain.
"There are lots of smaller sites where no contribution is made because it is not worth the council negotiating a section 106 deal.
"A lot of small developments have a big cumulative effect."
She also said the government was keen to expand the new housing planning and delivery grant to cover the renovation of empty homes.
But she said this would not be done in the initial tranche of funding.