More than 60 percent of the 100,000 affordable KiwiBuild homes could be built in Auckland - 11,000 more than the policy promises.

A Cabinet paper released to Newshub under the Official Information Act reveals that in some regions KiwiBuild won't be able to deliver homes that are more affordable than what is already in the market for first-home buyers.

The paper outlines that if the houses are delivered in proportion to each region's need, 61,339 of them would need to be built in Auckland.