I think it depends on the size of the current oven/micro combo. 27"? 30"? My advice would be to take a picture of the unit, write down the brand and model numbers, then take it to an appliance dealer to see if they can find something that will work.

What is the brand and model of the existing appliance?

Look up the specs of the existing unit and the specs of what you want to buy and you will have your answer. The few times I have helped clients with this, there has had to be modifications in the cabinet to make it work.

Whether they fit will depend on the models of micro/ovens you look at. How old are the appliances that you are changing out? If they are old, new ones will probably be different in dimension. I replaced a 15 year old Kitchenaid micro/oven with the “same” combo. The new combo was wider and shorter by a considerable amount. This did require reworking the cabinetry. The hole needed to be widened, and I had a new deep drawer crafted for beneath the unit to fill the extra space. Thank goodness my cabinets were custom and the drawings were still on file with the company that made them (KountryKraft!). I believe a new electrical box had to be installed behind the unit, too. I hate to admit it, but this might not be an easy swap for you.

Thanks for your answers! I did the measurements, and we WILL have to re-do the cabinetry, and possibly the electric. Won’t know until a kitchen remodeler comes out.

Where will your MW go if you remove it from the oven stack? (Please do not say over the cooktop as in an OTR MW!)

@awm03

I need to have a shelf built inside my microwave/oven cabinet to hold my microwave over my wall oven. Can you share how they did this as I have gotten different approaches and prices. Tried to reach the appliances manufacturers but could not reach a live person and the manuals did not detail this information. Appreciate whatever you can share in what was done to your cabinet and new shelf.

"Tried to reach the appliances manufacturers but could not reach a live person and the manuals did not detail this information."

Appliances manufacturers aren't going to tell you how to build a shelf any more than an automobile manufacturer is going to tell you how to build a garage. The manual does tell you the size of the appliance; where the oven can be located; and the electrical and ventilation requirements. It's up to you to take this data and design the shelf. For example, the product overview of the LG LMC2075ST provides the oven's dimensions, and states that the oven must be on its own 15 or 20 amp circuit and that there must be 4" of open space on all sides for ventilation.

Speak with the people from whom you bought your new appliances. They might recommend a carpenter to you who will be able to do the work, following the specifications for the microwave, ovens, etc. Installers will do the necessary wiring. If new cabinetry needs to be built and installed, then you will need to contact whoever supplied your cabinets or a cabinet maker to match what you have. I buy my appliances from a local business, not a big box store. They provided names and contact information to me for the carpenter and the installers. I had to resolve the issue of my new cabinet/drawer on my own (see above).

The cabinet is there with the proper electric. It housed a microwave/oven combo that needed to be replaced. I bought 2 separate appliances. The wall oven is installed. I was seeking info on the installation of the new shelf and how many inches should it be above the wall oven.

To clarify: I was not trying to contact the manufacturers about installation of a shelf but to find out how high the shelf should be installed oven the wall oven for proper ventilation.

Yellowjaq22, search online to see if the installation specs are available for downloading. Many sites that list the appliance for sale also have links to the user manual & installation spec sheet. You'll probably see the space requirements there.

I bought my oven from a local store. They recommended their own installer who also is a contractor & does their kitchen reno work. He cut & built the shelf, & hired his own electricians to create the new outlets (1 for the oven, 1 for the microwave).

"...to find out how high the shelf should be installed oven the wall oven for proper ventilation"

Read the instructions that came with the oven.

Thank you.