I think the first question would be whether the current hedge is shared by both properties ? If a shared boundary, why does your neighbour want to remove the hedge and what does he want to replace it with ? Do you agree to the removal and his choice of replacement ? I don't think that roots of the 3 plants you mention will be a problem for foundations but perhaps your neighbour can tell you whether he intends to just cut down or whether he intends to go further and remove/kill any trace of the current hedge before re planting ?
That issue had already been raised @Dovefromabove but no specific answer from the OP. TBH, if there is any real worry about foundations, it would seem sensible to get the opinion/advice of a qualified building surveyor.
Cutting down privet won't kill it. It will regrow from the roots if they're not removed. My neighbour replaced the privet hedge between our properties with a fence a few years ago. Their contractors took out the roots with a mini digger but they missed a few bits (to be fair, they were being careful and trying to minimise disturbance to my plants in the border that was backed by the hedge). I still find bits growing back occasionally.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I mentioned earlier that there would need to be a problem with the soil or the foundations for those plant types to be a major problem, but without proper, clear info from the OP it's hard to tell what the site is really like.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
My apologies. I was describing the old hedge. He intends planting with a larger leafed hedge. I don't know the variety. He doesn't like the multi hedges which are currently planted.
I think all you can do is check exactly what "larger leafed" hedge your neighbour intends to plant, how he intends to deal with the removal of the original hedge and any residual roots/possible regrowth which may affect your property and go on from there. If your neighbour remains a bit vague about with what/how he is making his new hedge, and you remain concerned, you will be better to obtain some expert advice as suggested earlier. Hope you manage to resolve the issue - neighbour disputes you can do without
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I think a lot depends on the size of the hedge …
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
TBH, if there is any real worry about foundations, it would seem sensible to get the opinion/advice of a qualified building surveyor.
I live in west central Scotland - not where that photo is...
If your neighbour remains a bit vague about with what/how he is making his new hedge, and you remain concerned, you will be better to obtain some expert advice as suggested earlier.
Hope you manage to resolve the issue - neighbour disputes you can do without