The microwave slides into the new cubby with pleasing precision. A narrow gap on every side looks beautifully intentional. The appliance may have preferred a less elegant amount of air.
Check compatibility before designing the niche
Whirlpool's comparison chart distinguishes countertop-only models from units compatible with built-in trim kits. Use the exact appliance and kit instructions. A decorative surround made by the cabinetmaker cannot establish compatibility by itself.
Leave a route for replacement and ordinary use
Check the door swing, outlet access, controls, and removal route. Try lifting a full bowl from the proposed height before committing. Appliances also change: make the niche serviceable rather than permanently trapping a particular model behind trim. Keep required ventilation openings clear of liners and stored items.
Before the next step
- Confirm built-in approval for the exact model.
- Match any required trim kit and opening dimensions.
- Check safe reach and future appliance removal.
The best cabinet detail is one the appliance can live inside. Measure the ventilation requirements as carefully as the visible stainless-steel frame.