You will need the same planning permission with residential farms as you would with any other property. Traditional farms usually come with various adjacent buildings which have been converted to accommodate living conditions.
Its important to note that you will need 'change of use' planning permission if you intend to convert an agricultural or industrial building into residential living accommodation. A planning report will show you if the previous owners have had similar applications denied.
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If the converted space does not meet the necessary planning permissions and building regulations, it could be unsafe to live in, especially if you consider the age of the property. A qualified RICS surveyor can make sure your property is safe to live in through a full farm building survey.