Renegotiate after offer accepted because of neighbour?

[TheLondoner00]

Had an offer accepted recently. As part of the searches and due diligence, my solicitor flagged that the next door house just received planning permission to create a set of flats and do a full roof and back extension that extends past the property we are trying to buy. This will partially block the sunlight and reduce privacy because the neighbour’s top floor balcony will overlook into the property. There is no way the sellers can deny this because this is exactly what they submitted to the council as an official ‘objection’ during the consultation phase (no idea how this still got approved by the council, but here we are).

As this will significantly impact the property and my ability to sell it on in the future, can I renegotiate my offer? If so, what is a reasonable amount to put forward?

For context: the offer that was accepted was almost 10% below asking, but the property had been on for awhile (likely because it was overpriced), there were no other offers, and I think the sellers are desperate to move on

I think @ReadersD1gest might have been questioning if paying £500k for a home makes you a better neighbour than somebody in private rented accommodation or social housing.

There are no guarantees of course, but in the real world you're probably much less likely to encounter antisocial behaviour from owner occupiers than social housing tenants with no financial skin in the game.

The whole purpose of the searches is to find out this wort of thing and protect the buyer.

Personally I would pull out - it all sounds grim.

If you are so struck by the house that you are willing to tolerate all this then you need to put in a MUCH lower offer - minimum 10%, but I would try for more.