I am looking to build a small single storey side extension to my property. I am trying to find out if the externals walls have to be cavity or can a single skin layer of concrete block be used and then an optional way of insulating on the inside be used to pass the required building regs? I am thinking of some kind of wood baton/stud work with insulation then plasterboard on top with skim coat? I am struggling to find any clear guidance to this online. Thanks
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