Advice Needed: My Tree May Need Removing!

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I would get another couple of tree surgeons to give their thoughts.
Maybe think about removing the root you have found it is unlikely to do much harm to the tree.
Do you know what type of tree it is?

 

Looks almost like a cedar.

 

As Nigel has suggested you could remove the root, possibly cutting it back to where it's surfaced but there might be other roots heading in the same direction.

How far is the tree from the back of your house and mains utilities, water, sewer etc.?

 

Thanks for the replies.

So distance from tree to my house is about 8 metres give or take.

So if I go down the line of cutting this thick root. Would it be a sensible idea to dig the grass up nearer my house to see if there's any other roots to remove?

Also the other problem is the roots might be going into other directions of my neighbours' gardens too. Do I need to be concerned by this?

 

I had problems in a previous house with roots from my neighbours conifer hedge causing damage to my sewer and house foundations. The roots will break through anything other than 'plastic' because it is porous and they are searching for water. This family of trees are shallow rooted but spread widely, sometimes as far as their height. Personally I wouldn't plant this type of tree within 12 metres of my home, neighbours homes, and services.

Yes, you can do that but removing too many roots will make the tree unstable.

Yes. In my case I claimed on my house insurance for the sewer replacement and repairs. I was told if a second claim had to be made in the future it would be from my neighbours insurance.