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Depends on whether you're buying the freehold, or leasehold. Garages are often leasehold (with shared freehold).
If the freehold, then in effect you own both sides of the boundary and can do as you please.
If the leasehold, then you'd technically need the permission of the freeholder (which could be ALL other garage owners) with some sort of agreement to revert the boundary if selling.
There’s some garages behind the back of my house. 4 of them which presumably belong to some of the properties behind my house also. If I wanted to try and buy these and then have them form part of my homes boundary what’s the process?
Buying them would be a different process from having them included in the boundary? Very hypothetical question and probably totally stupid!