A second firm, Wepre Developments, is also being sued.
The writ claims that Kearns and Roberts made use of materials intended for use on a housing development in Wrexham for a £26,000 driveway at Roberts' home in Denbighshire and to fund other refurbishments.
It is claimed the directors issued false invoices on behalf of Roberts Homes. The company claims that no explanation was given for a fall in expected profit on the site from £1.6m to £870,000.
The two directors said the writ was being "vigorously defended".