Removal of half a gable end on a semi detached bungalow

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

rodders57 said:

Is it fair and just someone can granted planing but leave the neighbours house devalued.

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How do you know it will be devalued?

Anyway, even if so it's not a valid planning concern. You would be better off objecting on the basis of its impact on the enjoyment and use of your moms property. Also review the council's planning policies and comment on how the extension/ conversion meets or fails to meet theses.

The party wall act will probably apply. Make sure the neighbour serves notice on your mother if it does. Read up on the advantages this will bring.

Properties don't get devalued just because there is a dormer next door. What you are doing is justifying your dislike of the neighbour's plans, by believing it will somehow devalue the property. This is a common response when a neighbour applies for planning permission, but it's a flawed response, in all but the most extreme circumstances.

All councils have local planning policies, and often specific supplementary home extension guidelines. Find them and have a read.

Also search for how to effectively comment and object to a planning application. You can't just complain and say you don't like it. Planners don't want to hear just moaning, but want to know how the development will impact on daily just of the property, and there are key phrases to mention - amenity, overbearing, incongruous and suchlike.

The objection is definitely not about a dormer or personal opinion on how I like the look of it. The objection is about the development of a property on how the design and integration relates to the existing property and those adjoining it. As in my opening post "We don`t care how big an extension/development they want to do"
The existing 2mtr extension ( in the photo ) will be demolished back to the original building footprint but only on one side ( obviously) and be replaced with a four meter long flat roof extension lower than existing leaving the left hand house with a triangle of roof running back to the chimney. Anyway thanks for your comments and advice on the wording