Nothing compared to done of the other posts here, but we're looking to widen our external front door. Currently the entrance to our house has 2 doors. A pvc door, a tiny 3 foot porch, and then the original wooden door. Both doors are within the original footprint of the house (not an added on porch). Our ideal scenario is to remove both doors, knock the 3 foot internal wall between them, and widen the external entrance (adding a window pane beside the new door to let me light into the hall).
I've a rough idea of what needs doing, but I'd be grateful if anyone can put a few figures on what each bit might cost.