Hi everyone , just needed some advice, first time on this forum so hoping you can help. Im currently having a 2 storey extension built at the rear of my terraced house. When the footings were dug out the builders found that the existing gas and water mains would run through the new walls of the extension about 10 inches above the new concrete foundation. They said they weren't sure whether the gas would need to be moved because gas mains are not allowed to run under your house. Is this right or can they be left in place and some other method used. and would this also apply to the the water main.
Thanks in advance