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This is a minefield. I’d think carefully about what you want, get some Pinterest photos together and see if any neighbours have done anything similar to what you want. We are half way through our extension which is double height, so bigger than yours but we went through 3 architects as the first one we didn’t like his idea and he wasn’t willing to compromise. So that was a waste of 1.5k.
I’ve previously done a side return and loft that was the same as the whole street had done and we got a architect recommended who was from 100 miles away. I think he came once, if at all. It was perfect as all the plans were already on the councils planning portal and he was cheap. It wasn’t complex. If yours isn’t complex think about getting all your info together then asking for specific quotes from recommended people. It’s easier for them if they can see clearly what you want and this will be reflected in the price.