How much approximately will a conservatory cost?

[nibblingfingernails]

I am thinking of a conservatory but have no idea how much they cost. I am not sure who to go and see at the moment as I have to save for it 1st which I don't mind doing but really don't want to embarrass myself if I haven't saved enough.

I am thinking of one that is probably 10ft by 10,ft maybe a bit smaller. I do want to use it all through the year.

Anyone got any rough costs and any do's and dont's?

Thanks in advance

Surely 10ft by 10ft is quite small? It's not 10m! I'm horrified at some of the costs quoted on here. I was quoted (well estimated) £15000 for one that size a month ago, including a new door into it.