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The builder is a really nice guy and he's done a good job elsewhere - but this is something we are still discussing. To be honest I thought my wife had paid him a couple of weeks ago, but she hadn't as she wasn't happy with the toilet and then this happened.
The company who dealt with the drain blockage was Quickclear - they are well-reviewed and got the blockage cleared (I was watching closely mainly because of my morbid curiosity) but the guy wasn't their most experienced and I think getting them back for a CCTV survey might be a good idea just to ease our minds.
tbc-
Get the CCTV survey done as it is the only real way to identify the issue without tearing things up. Also looking at QuickClears website they offer the service at a reasonable price.
This will give you a starting point to discuss things with the builder and resolve the situation. Or find someone else to fix it.
Bobbo
Too steep a fall can also cause issues. Basically the water outruns the shit causing blockages, it would take longer to become apparent though
If this is happening after a few weeks then something is very wrong. Again, have you told your builder why you are withholding payment from him? It sounds like whoever installed the drain has messed up somewhere (I'd assume your builder either did it himself or organised someone else to do it), there are other things that could be causing this but all will be as a result of poor fitting, as I see it your two best options are: