Architects are mostly useless idiots. They will show you a lovely rendered version of your plans then charge you loads for any alterations. In fact they just spend 10 minutes tweaking their Sketchup model. Do an image search for "sketchup house models" to see what I mean.
Also architects don't seem to understand the concept of ducting. I had to drill through just about every load bearing stud in an expensive new build to get the wiring installed. I burned out a set of new augers and the place looked like a Swiss cheese afterwards.
P.S. Sketchup is easy to learn and there might still be a free version available.