Internal migration is driving a boom in Canterbury housing construction. 

The region's councils consented around 6,500 homes in the past year – a fifth of the country's new builds. 

Construction Analyst Mike Blackburn told Francesca Rudkin that it largely down to comparative house price values. 

He says people can buy a brand new home in Selwyn or other parts of Canterbury for substantially less than Auckland and Wellington equivalents. 

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