Taking into account sunshine (It's briefly been sunny after a lot of snow here) you can see who's got plenty of loft insulation (or no heating on) - on the semis there's a band inbetween properties where the dividing wall is that melts first. And on the house with the strange extension on the roof their snow melted first of all this morning.
(It's a really strange dormer extension that sticks out at the side as well as the back - the one they had the huge amount of scaffolding for ages ago)
So what can you do about the gap between houses? Is it a cavity up to the roof and should it be insulated?