In our former home, we hung a Black & Decker toaster oven from the bottom of an upper cabinet, using a bracket designed for the purpose. I don't think B&D is being made anymore, & we opted for a regular toaster in our new home.

The main issue with a toaster oven is heat -- you want plenty of air space around it, so I don't think building one into cabinetry is a good idea. Plus, if/when the oven dies, you could have problems size wise with a new one. Toasters are supposed to be unplugged when not in use, which would be another problem with building it in.

A better idea would be having it in an appliance garage or on a shelf in a cabinet with fold-back doors.

My parents use a toaster oven more than they use any other appliance I can think of, except of course the fridge. Over the years they've gone through a lot of them, from cheap B&Ds to expensive Delonghis to everything in between. All of them, for a frequent user, seem to be good for a few years at best. So I wouldn't make any permanent plans. An appliance garage as gizmonike sounds like a better plan to me. And that's without starting to talk about heat issues...

I'll talk about heat issues! Toaster ovens are uninsulated, or if they do have insulation, it's extremely minimal compared to a wall oven. That means when you're crisping that slice of leftover pizza at 400° that the sides of that oven are probably 390°. That amount of heat will damage wood finishes. Higher heat will actually char the wood. Even if you built a metal box "enclosure" around the toaster oven, that metal will actually conduct the heat to the wood. Maybe only 300° of that 400° gets transferred, but the reason we choose metal for our cookware is because it transfers heat! Metal isn't a good choice to "insulate" wood from heat unless you have a layer of high heat insulation between it and the wood being insulated.

If you use a toaster oven that much, then consider looking at one of the GE double wall ovens that fit two ovens in the same space as a single oven. The smaller oven is similar in sizing to a large toaster oven. The GE double oven range also provides a small oven on top with larger oven below. Those choices can give you the utility that you seek with the safety that you need to consider.

We use the MW and the toaster oven more than anything else too. Have been looking for a built in that would replace both in a relatively small space. The two candidates are the GE 27" Advantium 120 and the Kitchenaid 27" convection microwave. Am leaning toward the KA because it uses a quartz broiling element rather than halogen -- just seems a bit simpler, older technology. Also has the MW and convection fan. The two products have similar space inside. The KA requires a 240 line. Would welcome inputs on which product . . .

Thanks for the feedback. We use a toaster oven and microwave on a frequent basis. Both take up a lot of counter space.

We plan on getting a built in MW, possibly the Sharp OTC, and want to do something about the toaster oven. I think I will look into having it on a shelf with plenty of air space around it. Anyone know how much space should be around a toaster oven?

If I make it a slide out shelf, then it can be slid out when in use.

By the way, I've never unplugged our toaster oven as gizmonike sugested. Does that hold true with other small appliances such as the coffee maker?

Also, Ikea, Whirlpool and GE have 24" wall ovens.

Sharp has a Drawer Microwave (model 6524). It's designed to be built in.
Also, Dacor, Viking and one other manufacturer.