I am in the process of buying a Victorian end of terrace house and have just found out that there is a public sewer running underneath part of the property... Is this a no-no? I intended building a side-return extension, but this would be again over the sewer... Would this cause a problem? I would appreciate any advise you can give me as I don't know whether to proceed with the purchase... or am I setting myself up for a major disaster... Thanks!!