Can anyone help next doors boiler flue balanced over boundry line and im building extension can i just build infront of flue without touching it and it still be legal for them to use as there is not going to be much air flow the boiler has been in ten years
If the boiler has been there for 10 years, there is very little you can do at this point. You could have challenged the installation when it was done, but after this long they have effectively your quid pro quo permission.
You will have to consult with a RGI to see what you can build safely, strange as it may sound, the onus is on you to find out what is safe and what not.
You will have to abide by what their boiler manual says, and failing to do so is technically a criminal offense.
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