So tell him ‘kthanxbye’ - as has been said several times now, your builder needs to be allowed to make good the damage.
Alpha up and sledge hammer his garage down and tell him that’s the problem fixed.
Also as stated, you employ a professional, its their issue if they mess up, not yours.
They need to be given the opportunity to inspect the issue and propose a solution.
Nah, this isn't right, OP's builder doesn't need to be given the right to do anything here as the neighbour has got nothing to do with him.
It's generally the done thing,
if you hire a builder and they mess up, to give them the opportunity to put right anything that they've done wrong. But in this case
the neighbour didn't hire the builder and seemingly didn't even give permission for anything being attached to his wall.
Also, from the neighbour's perspective, the liability is with the OP AFAIK, the builder was hired/was working on behalf of the OP so the OP is the person the neighbour will pursue (if it comes to small claims/county court) it is up to the OP to pursue the builder.
Ideally, the neighbour would simply let the builder fix the issue and (if the neighbour wants) tell him not to stick anything else in his wall and to dig a post in instead but I guess the neighbour could also just tell the OP he doesn't trust the builder, get his own builder round to fix it (inc removing the fixings from his wall) and invoice the OP. OP's builder then perhaps needs to dig a hole for the post instead.
Where it is going a bit OTT is this claimed need for a structural engineer to come round. I'd be annoyed at the OP too and perhaps wouldn't have much faith in his builder either, why didn't the builder ask (either the OP or the neighbour) if there was permission to fix this to the wall? Why was the builder so sloppy that he's just made some wild arsed guess about the wall perhaps being thicker than it is and managed to blow out three bricks?
He is expecting me to pay for the
1. Structural Engineer visit
2. Fix the bricks
3. And a sign of from an engineer. I have to pay for all these it seems to solve the issue.
I assume he will exploit money out of me for the above and never appoint a structural engineer.
That's getting a bit silly tbh... get invoices for anything you need to pay. A structural engineer generally isn't going to be looking to collude with some random client on a ridiculously small job to scam you out of a few £s and will have a standard hourly fee etc..
This thinks me of a different angle now!!.What if he himself damages along with the brick damage and tries to prove its a structural damage?.Is this scenario a possibility here? Or a structural engineer giving false report about the damages?
Well for a start you've mentioned he's already shown you a photo of the damages? He's just not sent the photo to you.
Why don't you just communicate with him a bit better, this is partly your fault if you didn't ask for permission - you should have asked or just instructed your builder to dig in a post. If you'd asked you might have found out there is only a single layer of bricks (and frankly your builder is a total dumbass for just cracking on without having any clue how thick the wall is too).
You think it is excessive for a structural engineer to come around and as everyone has pointed out it very likely is, you, however, have actually seen the photos of the damage (we haven't), what you could say is you're happy to make sure the damage gets put right (ideally, for you, simply by having your builder fix it) but you want to get an opinion from others re: the need for the structural engineer ergo you want him to send you photos of the damage (that isn't unreasonable).