don't think a "built in" is out there. you can prob. find a microwave that is 20 1/2" -22" wide and just place it in the space. If you really wanted the look you could order a kit from micro -trim to fake the built in look.

Thanks for all the replies - I can understand why people are suspecting my contractor of ignorance. That can happen, but I don't believe it to be the case this time. I think he is making sure I am happy with the outcome and have a oven that won't tip or tear out cabinet face frame. Maybe he is being over cautious.... It sounds like it is possible to just set the 27 inch oven on top of a base support instead of IN a 27 inch cabinet - is this correct? Then use some filler pieces if there is any space left exposed, right? Ok, so how would you secure the oven if you are NOT screwing clips to the face frame. If we were to anchor it to the back of the wall, it would certainly be secure, BUT, if the oven ever needed servicing or removal, would we have to remove our granite counter to get at it? Also, what should we do about supporting the granite counter above? Should we use the MDF vertical cabinet sides on either side of the oven?? I'm not at all concerned about the cost of the cabinet. It was only $130, then Home Depot gave me another $50 off when I asked about the problem with their cabinet specs. My only concerns are making sure the oven is secure with support for the granite. This oven will be adjacent to a wall, so it is at the end of a line of countertop.

Frigidaire FFMO1611LS 1.6 cu. ft. Capacity Countertop Microwave plus Frigidaire FFMOTK27LS ----------------- Sharp SMC2242DS 2.2 cu. ft. Capacity Countertop Microwave plus Sharp RK56S27 ----------------- Panasonic NNSD945S 24 Inch 2.2 cu. ft. Capacity Countertop Microwave plus Panasonic NNTK922SS

Can you take a picture further right? I would not invest in a 27" oven. Go up to 30. That narrow counter and cabinet above would need to be cut off. You'd need a side... So yes, I'd look into having the cabinet re built. Failing that? Even separating the two at a 27 " single oven and a 24 micro with trim kit is going to take a bit of re configuring........ But You can do GE profile,,,,,, 27 and separated. NEVER buy the total unit combo's despite they are fewer $$$