The construction sector is falling to the back of the pack when it comes to business confidence.

The latest ANZ survey shows confidence jumped 6% in April, with only a net 2% expecting worse conditions ahead.

Chief economist Sharon Zollner told Mike Hosking the construction industry is struggling with issues around supply of materials.

"That'll be certainly slowing activity and dampening confidence. I think it's a bit daunting starting a project if you're not sure you're going to be able to get all the materials to finish it on time."

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