We have had a series of jobs recently were we have been called in to redo plumbing that was done by amateur DIYers. Normally when this happens its because the dodgy plumbing has failed and resulted in a persistent or catastrophic leak.
One of the jobs we were called to last week was because a downstairs neighbour had complained of a leak through their ceiling. It turned out that our customer had recently purchased the house not realising that all the kitchen plumbing had been done by the previous owner himself. What we found was that all the waste pipes were actually running up hill which had resulted in a blockage and the waste water from the dishwasher flowing back up the stand pipe when the dishwasher drained.
In the end we had to pull out all the kitchen cabinets and redo all the kitchen waste plumbing. A full day of work and certainly not what the customer wanted to find out about her new flat.