Hi all hope someone can help. My elderly mother lives a semi detached bungalow. At the rear of the building both sides had and extension built years ago before my MIL moved in which was 13 years ago. The soon to be new owner wants to demolish their half of the gable end and build a single 4mtr extension from the original house. The flat roof will have a roof lantern in. They also want to convert the loft with a full width dormer. This would leave the MIL side looking absolutely ridiculous and probably affect the value of the house. Its up for planning and I have objected to the design of the extension because it would look pants. They have got approval for the extension but have separately submitted planning for lot conversion. Is it fair and just someone can granted planing but leave the neighbours house devalued. We dont care how big an extension/development the want to do but their work will leave a stupid looking triangle section of roof. I am a bit behind what is acceptable for planning these days. Photos enclosed from the MIL side. TIA