We currently have an average-sized 3 bed semi. We like the road and the location. The neighbours are all nice. When we bought it, the house was not in a great state and we have spent quite a lot sorting it out and redecorating to our taste. The downsides are the lack of parking and a slightly smaller garden than we would like.
We have unexpectedly come into some money which would be enough that we could now afford to buy a larger house in the area. It would also be enough to convert the loft and build some sort of extension to our current house. Other houses on the road with similar layouts have done this so it is possible. We have small children but they are generally able to cope well with changes.
It's a bit hypothetical at the moment as we've not even looked at houses but I'd welcome your opinions on or experiences of this.