Our house has a hideous and very broken conservatory built across the back of it. It's over 20 years old, very cheap and naff plastic, it leaks, has no heating or electricity, and I think there are creatures living in the insulation. We use it as a shed because it's unfit for anything else. I want to rip it down and make more space in the garden in the process, but DH thinks it will devalue the house. But surely nobody would pay extra for something that you can't even use as a proper room and makes the whole back garden look scruffy?