Nick Smith is Minister of Building and Housing, charged with affordable housing matters, such as construction.
He would also revisit the Resource Management Act reforms aimed at speeding up housing developments.
Community Housing Aotearoa director Scott Figenshow said sharing housing responsibilities among three senior ministers was a sign of the importance the Government attached to the issue, but he warned against separating "social housing" policies from broader "housing affordability" issues.
"We have always talked about a full housing continuum. We need to see continuity through that continuum, not making new silos," he said.
Many housing providers, such as Habitat for Humanity and the NZ Housing Foundation funded by Sir Stephen Tindall's Tindall Foundation, aim to help low-income people into home ownership as well as providing cheap rental housing.
NZ Council of Christian Social Services president Lisa Woolley, whose agency VisionWest also provides social housing, said the three ministers showed that National was taking the housing issue seriously.
"Putting three ministers together who have been working in the area of housing already should help to continue the reform programme that they have started," she said.
"Paula Bennett, in her Minister of Social Development role, really understood the issues to do with social housing, so she has got traction already. I think this is a really positive move."
Mr English, as Minister of Finance, was already one of two ministers responsible for Housing NZ, along with Housing Minister Nick Smith. The agency is monitored by the Treasury.
Salvation Army social policy director Major Campbell Roberts said there had been a lot of "setting the stage" for more social housing, and now it was time for action.
"Paula Bennett has shown that she is prepared to take action," he said. "Whether we always agree with that action is another point, but she does take action, and I think the housing area is crying out for that."
He said there was a "desperate" housing shortage in Auckland and Christchurch.
"We have got people daily now coming in with what I would describe as critical
situations," he said.
"It's a comprehensive approach that is needed. It's not focusing on one aspect. It requires a focus on the social housing area, it requires a focus on home ownership, it requires getting more people in the medium to low incomes into housing. It requires the sort of approach that will support organisations like the Housing Foundation and Habitat for Humanity and ourselves and others who want to get into the social housing space."