Mr Nisbet added: "We have had a verbal agreement that they owe us more money and that's why we've not paid them.
"We will be vigorously defending this.
"It's disappointing. I've bent over backwards to help them in the past."
David McLean has recently filed its accounts at Companies House showing group turnover rising substantially from £207m to £279m for the year to June 2006. Profit before tax was £5.18m, up from £5.06m in 2005.
Mr McLean said he was confident the business was through the worst of its recent troubles, that included accounting problems, and now had a strong future ahead of it.
Mr Nisbet owns a number of other property development businesses that are unaffected by McLean's petition.
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