An early-morning fire caused extensive damage to a vacant house that the owners were fixing up to sell. The cause of the two-alarm fire at 32 West Dudley Road has not been determined, but Fire Chief Dean Kochanowski said it was not of suspicious origin. The house is owned by an elderly woman who does not live there, he said. Chief Kochanowski said firefighters called to the house about 5:45 a.m. Monday found flames along the roof line. The chief said the Fire Department initially had trouble getting water to the fire because the house is outside the water district. He said the town received help from area fire departments. The fire was brought under control in about a half hour.