The last time I tried to engage a cutter company for coring through a 4ft wall, they wanted £400. Toolstation have a 4 1/2inch for £25.
There is an Erbhaur(spelling?) one for £38 which gets loads of good reviews along with a slotted diamond disk for about£16 TBH if somebody would do it for £300 I would happily pay as we have clawed back a fair bit of the budget elsewhere.
You could try concrete cutting companies, but I think they mostly wet cut. (hosepipe amounts of water)
@Mr_Smyth started
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The last time I tried to engage a cutter company for coring through a 4ft wall, they wanted £400.
Toolstation have a 4 1/2inch for £25.