My builder has given me pierings(30 linear meters)for free and would be charged extra if we need extra pierings. Last week builder did the pierings and we end up in having 26 holes which added up to 67 meters(as few holes were quiet deep). So I am not sure now if I would be charged extra as the total piering now is 67, not 30.
Is there anyone out there who can help me in calculating this???