I'm currently debating an extension and playing around with some potential floorpan layouts.
My current favourite is the L shaped kitchen with the second lounge/den (I think it comes up as picture 3).
It would give us a small entrance for muddy boots, bags, shoes and coats, a proper dining area nook (which is currently just a dumping ground of said coats, bags and other stuff) and more living space downstairs.
Keen to hear any thoughts or get some great ideas I hadn't even considered.