I will be doing 1st fix on an extension to a 3 bed house. The customer wants the new 17th ed CU to go in the garage which is integral to the property. The existing CU is in the hallway of the house and the Buildings inspector has said to the occupier that he thinks that the new CU should be fitted where the old one is as it's in the dwelling itself which makes things easier to reset if devices trip. I too think it makes sense . Is there a ruling to say that a CU has to stay in the dwelling and not the garage even if the garage is built on the side of the property.I will be speaking to the buildings inspector myself on Monday but my guess is that what he says goes..especially when it all needs to be signed off at the end..