Installing a microwave bump out kit is a strategic home improvement project that transforms a standard, often awkward cabinet installation into a seamless, built-in appliance. This process involves modifying the existing cabinetry to create a deeper, more integrated housing that allows the microwave to sit flush with the face of the cabinets. The primary goal is aesthetic cohesion and space optimization, removing the visual bulk of an over-the-range unit that protrudes into the kitchen space. By following a precise methodology, homeowners can achieve a professional-looking result that elevates the overall design of their kitchen.
Understanding the Microwave Bump Out Concept
A microwave bump out is essentially a framed extension of your current cabinetry line. Instead of the microwave sitting on top of or flush with the cabinet face, the cabinet box itself is extended forward to accommodate the depth of the appliance. This creates a "bump" or a deeper section of cabinetry where the microwave is installed. The finished product presents a uniform front plane, hiding the standard depth of the microwave, which is often shallower than the depth of traditional base cabinets. This technique is particularly valuable in kitchens where standard cabinet depths create an awkward gap or protrusion.
Essential Tools and Materials for Installation
Success in this project is heavily dependent on having the right equipment and materials. You must gather everything before beginning to ensure a smooth workflow and prevent mid-project trips to the hardware store. The specific requirements can vary based on the kit and your cabinet design, but the following list covers the standard inventory needed for a typical installation.
Required Tools
- Adjustable wrench or channel-lock pliers
- Phillips and flat-head screwdrivers (both manual and electric)
- Drill with a selection of drill bits and countersink bits
- Stud finder with a deep-scan capability
- Level (preferably a long 36-inch torpedo level)
- Tape measure and carpenter's square
- Utility knife and cutting tool (for finishing)
- Safety glasses and work gloves
Required Materials
- The microwave bump out kit (ensure correct model number)
- Wood filler or caulk for finishing seams
- Sandpaper (120 and 220 grit)
- Wood screws (typically included with the kit)
- Shim pieces for leveling
Step-by-Step Preparation Process
Before modifying any cabinetry, meticulous preparation is the key to avoiding damage and ensuring a level installation. This phase involves measurements, planning, and securing the work area. Rushing this stage is the primary cause of misalignment and cosmetic issues down the line. Take your time to verify every dimension before making a single cut.
1. Clear the Work Area
Begin by removing the microwave from the intended location. If the appliance is currently sitting on a counter or existing cabinet, unplug it completely and move it to a safe, out-of-the-way location. If the microwave is currently installed above the range, you may need to temporarily remove the range hood or at least disconnect its power to create a safe working zone. Protect the surrounding countertops and flooring with drop cloths to prevent scratches and sawdust accumulation.
2. Precise Measurement and Verification
Use your tape measure to determine the exact height, width, and depth of the microwave. Compare these dimensions specifically to the interior dimensions of the bump out kit's face frame. Check the stud spacing behind the cabinet wall; standard spacing is 16 inches on center, but this must be verified to ensure the kit's mounting hardware aligns correctly with the structural supports. Use your stud finder to mark the center of the studs behind the cabinet box where the new frame will attach.
Installing the Structural Framework
This is the critical phase where the bump out kit transitions from a collection of parts to a solid structural component. You will be anchoring the wooden frame of the kit directly into the studs behind your existing cabinet wall. Proper alignment and secure fastening are non-negotiable for the long-term stability of the installation.
Mounting the Rear Frame
Position the main rear frame of the kit against the back wall of the cabinet opening. Ensure it is perfectly level horizontally and vertically using your torpedo level. The frame must sit flush against the existing cabinet box to create a tight seal. Once aligned, carefully mark the screw hole locations on the drywall or studs behind the cabinet. Drill pilot holes at these marks to prevent the wood from splitting, then securely fasten the frame using the provided wood screws. The goal is to create a rigid box that is an extension of your current cabinetry line.
Attaching the Front Trim and Appliance
With the structural frame in place, the installation shifts to cosmetic finishing and appliance integration. The front trim of the kit is designed to match your existing cabinet doors, providing the seamless look. After the trim is secured, you will finalize the installation by placing the microwave into its new, deeper housing.
Securing the Face Trim
Install the side and top trim panels included in the kit to cover the gap between the new frame and your existing upper cabinets or countertop. These trims interlock to form a continuous face plane. Use the provided screws or finishing nails to attach the trim, ensuring the joints are tight and the surfaces are flush. If necessary, use wood filler to smooth any minor imperfections or screw heads, followed by a light sanding to prepare the surface for painting or staining.
Final Placement and Connection
With the structural and cosmetic work complete, carefully lift the microwave into the newly installed frame. Align the appliance with the kick plate at the bottom and gently nudge it back until it is flush with the cabinet face. Double-check the level of the microwave one last time. Finally, restore power to the appliance and perform a operational test. Run a standard reheating or cooking cycle to confirm that the installation is secure and the microwave functions correctly in its new, integrated home.
