DIY customers, including builders and contractors, are also taking advantage of the extremely dry Auckland building season.
"A lot of gib and cement is going out too. In tools, it's cordless drills - just about every home would have one - dual action saws with counter rotating blades and the multi-tool you see advertised on TV," a Mitre 10 spokesman said
Hartmann said building product sales rose 23.4 per cent last month on December 2011, hardware and gardening sales were up 7.6 per cent and renovation and decor product lines up 6.5 per cent.
Mitre 10 has a North Island big-store growth focus, aiming to head off Bunnings in a turf war one developer said was like supermarkets, based purely on footprint.
"The only way these businesses can really grow their market share and profits is to get more stores on the ground," he said.
Of the eight Mega stores planned, only Queenstown has been announced.
In August, the Environment Court approved a new Mitre 10 Mega store at Frankton Flats near the site where the consent for a Pak'n Save supermarket was being appealed. The proposed single-level 6249sq m Mega building on a 1.82ha site is surrounded by non-rural land and had a formed legal road running through it.
Locations of the other seven have not been announced because either resource consent had yet to be sought, had been applied for but not granted, or the business was not in a position to reveal further details of expansion, the spokesman said.
"But all seven are in the North Island and in a mixture of cities or provincial centres," he said.