Hello, newbie here. I hope someone with knowledge of PD regulations can help me? Next to my house I have a detached Victorian rectangular 10m x 5m outbuilding, previously used as a Blacksmiths Forge. It is an attractive period building, but not listed. I have had approval from my council for renovation and conversion into a Granny Annexe under Permitted Development. So far so good, and a structural surveyor judged that much of the original building could be preserved albeit with a lot of underpinning and strengthening of roof and walls. However, I have had two builders so far offer their quotes and both are of the opinion that the building could be dangerous to work on in its current state, plus it could be a 'money pit' and that it essentially needs demolition and rebuilding (where possible using recycled materials from the demolition). Does this fall under the scope of 'renovation' under PD or would I need to apply for full planning permission? We intend to rebuild on the existing footprint so that externally it is pretty much identical to the original building. Any advice gratefully received!