You need the seller of the house to remedy this before you exchange contracts because it is likely to be problematical if you come to remove the garage for any reason or the crops when you sell in the same way that it has cropped up now.
After more than 20 years of this being in place without consent or objection, the neighbouring property will have acquired an easement under the Prescription Act firstly to have the roof attached and secondly to have support from the wall. Therefore, if you were to remove the wall, you are removing the support.
This easement needs to be formalised for the seller needs to provide an indemnity policy against the lack of easement. They may simply refuse to do that and have the cost and the delay. It only costs a few hundred pounds so it’s unlikely.
It will not help however if you want to remove the garage and remove the support because you will have to provide more support. This is a good reason for a price reduction although it’s up to the seller whether they agree to reduce the price or simply say “take it or leave it”.
Can I clarify anything for you?
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At the moment the neighbour has an undocumented right (lack of easement) to support from the garage. It appears that they simply fastened theirs to their neighbours, so that their own garage only needed to be built with 3 walls instead of 2.
This isn’t an issue provided you agree between you what’s happening and provided in the future, if you come to sell, your buyer does not raise this as a query. That’s why I suggest that you get the seller who is obviously keen to sell, rectify and to create a formal deed in respect of the easement for the neighbour to have the support for their garage. There is no way unfortunately you can support if the neighbours decide to claim the easement after 20 years, under the Prescription Act
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The indemnity policies have standard wording which covers virtually every eventuality. They come off a block policy and the sellers solicitor usually will self issue the certificate and simply send the premium to the insurance company. The seller solicitor will send the draft certificate, before paying the premium, to your solicitor for approval.
The procedure is very common and not the least bit out of the ordinary.