Dave Polshaw and jonm are dead right - a local joiner is what you need. I see the chap who made my windows at least once a week and have had no hesitation in recommending him to plenty of people nearby. In turn, he's brought some business my way over the past few years.
He did a superb job recreating Victorian box sashes and they cost me half what one of the impersonal chains would have charged.
Stay local, and keep proper craftsmen working!