The layout means these are the only two options:
- We could add a small extension which would allow two existing rooms to be joined in one larger.
- We could add a conservatory with twice the floor space.
The main downside to the extension is extra cost for less space. But it would make the existing spaces nicer.
We have had a conservatory before and liked it though we didn't use it in the middle of winter.
So difficult to know which will actually be better value /we'll enjoy living in.