ChatterBank2 mins ago
fence issue
Answers
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For more on marking an answer as the "Best Answer", please visit our FAQ.Regarding Lonnie's answer, the conservatory may not have needed Planning Permission if the owner was able to use his Permitted Development Rights. This enables small additions without recourse to the planning system but there are size limits and other constraints on position.
Regarding Norman the Dog's answer, you may need Planning Permission for a conservatory and he appears to be confused about the difference between Planning Permission and Building Regulations approval. Conservatories of less than 30 square metres in floor area are regarded as temporary structures and do not need Building Regs approval (but nevethehless may still need PP).
Regarding the fence, you are perfectly within your rights to erect a fence up to two metres high along this boundary, irrespective of whether they would be able to open their windows or not. You do not need any permission. Indeed I am sure you would wish to do so, because this structure is looking straight into your garden.
Regarding retrospective action, do as Stanleyman suggests.