That's the thing ... there are not. And you are already prejudiced in your perceptions before you have even employed a builder. You are expecting bad work, and with that mindset you will certainly find it.
You do your homework before the work is even started by picking a suitable builder and getting good detailed plans drawn up, and not by sluething around when the builders have gone home at the end of the day.
There is a recent thread about how to select a builder.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local