"We got maybe a little more than I thought we would get at the auction. There were a few bidders and it came down to a war between two in the end," he said.
After the costs associated with the house's sale and removal, he said the school would profit about $65,000, "which ain't a bad fundraiser".
The foundation helped pay for things the school and community needed in areas that weren't supported by the Ministry of Education, he said, and he and its other members had been working on getting the charity going for the last six years.
"It's a decile four West Auckland school, we're not a wealthy community. Fundraising is a bit more difficult here than in the affluent areas," Mr Walker said.
But he was now in a place where his business and his life had been good to him, and this was his way of giving back, Mr Walker said.
The 20-year-old house's buyer, property developer Sumnesh Kumar, said he planned to use it as his site office.
It had recently been repainted, carpeted and given new lino, and came with a kitchen, bathroom, laundry and appliances.
Estate agent Karen Eppingstall of Bayleys North West, which marketed and sold the house as part of its Bayleys in Schools programme, said the initiative was a clever and timely way to raise money.
"For $80,000 the purchaser now has a pretty comfortable site office, he could even do a load of washing on his lunch break," she said.