Hi everyone.
For context, we have had issues with elderly neighbours who don't like change (we are a 60s semi detached housing estate where all houses look sameish). Lots on the street have been adapted with loft conversions and side extensions over the years. Neighbours now struggling with mobility and have put a request in for front extension (they want somewhere to store scooters I think and a toilet).
The design isn't something I would have personally (size is 7m2) and it'll look quite squished onto the house as will come straight out of window recess and will block their own light substantially. I have no issues with the size/position at all as it really doesn't impact my amenities.
I am really concerned about the visual design the neighbours have gone for… They have put on their application that they want to use gloss/shiny coloured bricks. They want half to be yellow and the other half to be a crimson pink 
I know they have quirky taste but everyone that comes onto our road is going to see this structure and it's going to stick out like a sore thumb! I think it's really going to spoil the area 
we have long driveways so based on the size, it will likely get approved.
I'm planning to put an objection in but haven't done this sort of this before- do I just say I think it'll look really bad? I'm not in a position financially to pay for advice, the planning office weren't helpful at all and we don't have the best relationship with neighbour so they wouldn't consider changing it based on our opinion.
The other neighbours are all fairly old and keep themselves to themselves so it's probably only me that will object.
Any tips? I think im still shocked about their design!