Labour says the Government's promise to investigate every reported burglary will increase police workloads by 42 percent.
Police Minister Judith Collins has revealed that officers currently only investigate 70 percent of burglaries.
Labour's police spokesman Stuart Nash says the new expectations can't be met with current police staffing levels.
"What we're going to have to do to meet this 100 percent target is take them from something else," he said.
"They're prioritising burglaries, which in an ideal world I think is fantastic. But you just can't do this without extra resources and without something breaking."
Mr Nash says hundreds more police officers are needed, but numbers won't increase until 2020.