I've recommended Olly on another post recently so copying and pasting from that, hope it helps:
I've been meaning to put a post up here to recommend Olly, who built a bespoke outdoor cat space for us about 2 months ago. A skilled carpenter, whose bread and butter is cabinets, cupboards etc, but very adaptable.
We had a quote before he came round that was two and half times as much as Olly quoted. Just be honest with him with what you want and expected budgets, he'll then accommodate.
Some of his work is here and contact details ---> http://olivercremin.tumblr.com
. Email me if you'd like his his mobile number - firstname.lastname@example.org