All, We are currently purchasing a house that has been subject to unauthorised development. It has undergone 2 extensions in the last 10 years. The first was a 2-storey side/rear extension in 2000 for which planning permission was granted. The 2nd was a rear conservatory - for which planning permission was not granted (or sought). The vendor believed he was erecting this extension under Permitted Development guidelines. I have roughly sketched the original house boundaries and both extensions: Vendor has recently applied for a legal development certificate for the rear extension, which has bee