Q: A householder wants to add external wall insulation 10 centimetres thick to the first-floor rear elevation of a terraced dwellinghouse that is not in a conservation area. I would like to say this does not require planning permission, but the General Permitted Development Order 1995 as amended does not cover such situations well. Have you any interpretations that might stop me adding to the argument that the planning system is an obstacle to sustainable development? JD

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