We're planning an extension for a kitchen on the back of our 3 bed terraced/semi. We're pretty sure what we want - size, layout etc, and I've been looking into architects/architectural technicians to draw up plans and help us with planning permissions etc, before we start trying to find builders. I've come across a couple of "Design and Build" companies, where they do the whole thing from start to finish, including the plans and then the whole build. I'm really tempted to go down this route, seeing as what we want would be pretty straightforward, and it sounds as if it would be the hassle free way to go. Has anyone got any experience with these kind of companies, or any opinions of them? (Waits for tumbleweed).