No, don't mix knob and lever hardware. I can't belive that reputable hardward manufacturers don't make a single or double dummy knob set. Good luck on your project.

The information posted above is not entirely accurate. Although most window and door dealers do not have "standard" non-lever handle styles, they are common and are available. They also perform well, if not in a round design, because the multi-point door gears do require additional torque to disengage. Levers work best, but oval handles are sufficient. Your door representative should simply apply some minor research and I'd bet that Andersen can supply them for you. If not, there are custom hardware manufacturers that make the correct hardware for most major window and door manufacturer's size specifications. One that comes to mind is named Emtek or Emtec, and their products are reasonably priced. Oval knobs have become quite common in bear country, as bears quickly determine how to use a lever handle to gain access into homes. We use oval handles on the exterior sides of almost all of our mountain home construction, and they are supplied by our window and door vendors. It was not an easy product to acquire up until about 5 years ago, but now it is a very common handle style. As for clearance on the interior, we have also used the extensions (we commonly use a combination of lever interior and oval exterior handles). The extension allows the interior blind to slip between the lever handle and the door. However, the blinds often requested on our projects consist of wide wooden slats, so the extensions still don't work well. We often suggest a cloth shade with brass rods top and bottom, in leiu of blinds, for door applications. This affords privacy, while also allowing some natural light through the fabric, unless they are pulled to the sides for full light exposure. Most importantly, this eliminates swinging blinds each time the door is used.

robin posted: "We had levers everywhere when I lived in Europe. I was forever catching a sleeve in one as I walked by, or a jacket. Or catching them on my arm--but I am not really graceful. They look nice but I got tired of the bruises and stretched or torn sleeves". When I had a serious fall with lots of injuries and had to get around the house, the levers were easier to use, but like robin mentioned, I kept catching myself on the hooks I would walk by! I cut off my belt loops after I got grabbed when walking by one door in particular! I even caught part of my sling and cast on one, and OUCH! I know one would say well, don't walk near a door, but, when on meds one tends to walk near walls and guide yourself around. Once my case came off, the lever again was easier to use with my sore hand. So, there are two conflicting reasons why I will rethink putting them in my next house.

I have a mixture of both lever and round in my home....round on the interior doors and lever on the entry. I have the oil rubbed bronze bath fixtures, and went with that color for the interior doors. However, at the suggestion of my decorator, I went with the black on the entry door as it is a dark wood door and we wanted some contrast. I'm glad I did. Hope this helps...