architects near Hitchin

[BabyBlueCardigan]

Can anyone recommend an architect for a small extension - study extending onto a patio. Don't just want bricks and glass, something a bit more interesting bordering on a garden room but not like a conservatory. It's a tiny space - so any companies who might want to work with something small but have an eye for design.
How does it work- do they come and look then bill, or do they do a free look and bill if you proceed?