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I had problems with my fathers wet room. My sister insisted we did not DIY and she arranged for a PROPER builder.
There was a time constraint as it needed to be finished before my mother came out of hospital as now with one leg wet room was necessary.
They over ran on time and seemed to have great problems cementing tiles to the floor seems the cement was faulty and would not dry. We had noted repair on electric under floor heating and were dissatisfied mainly as not finished on time.
After they had over run by 3 weeks my son told them it must be finished by end of that week and they walked off job never to be seen again. As part of the job the consumer unit had been changed, Lintel fitted where wall knocked down, and doorway altered.
On calling building inspector he passed the drains but found no packing under lintel. We had to remove tiles because of non setting cement and found lintel above door only supported on one side. This we got another builder to fix for us. The whole under floor heating had to be replaced as open circuit. And fault finding on RCD protected circuits was a nightmare. We were lucky building control accepted the installation certificate with no signatures against design and installation and a note to say I had only inspected and tested the electrics not fitted by myself. And a completion certificate was issued.
We were not told what happened to builders but know building control were looking into them and they stopped trading.
Why they didn't inform building control in first place must be they knew they were sub-standard as there was no charge for work for the disabled. They didn't get final payment but did get instalments.
From my experience the sooner you contact building control the better. We will guess the builder did not pay the electrician as he was to have returned to finish off the work but never seen again and builder was trying to DIY the electrical work. I would guess this is why no installation certificates were issued guess electrician wanted paying before issuing.