Extending kitchen cabinets to the ceiling is an interesting DIY project for many crafters, especially for those who wish to give their kitchen a new modern look. Kitchens built on a comparatively older theme are well suited for such upgrading-style projects. Some homeowners might be looking for inspiration to upgrade the look of their kitchen, while others might be just eyeing a project to express themselves creatively.
This article dives into the intricacies of the whole procedure and assists the readers in achieving the desired output.
Tools Needed
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Tape measure
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Miter saw
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Brad nailer
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Impact drill
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Pocket hole jig (optional)
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Table saw
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Level
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Screwdriver
Materials Needed
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¾ inch plywood (for building extension boxes)
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Wood screws
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Wood glue
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Trim
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Crown Molding
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Face Trim material (optional)
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Cabinet doors (optional)
Method to Extend the Kitchen Cabinets
Measure Space Above Cabinets

The first step in building new cabinet pieces is to measure the gap between the existing upper cabinets and the ceiling. This step is important because it helps to determine the correct height of the cabinet extension. The accuracy of the measurements ensures a perfect matching extension. It helps to cover the gaps between the cabinet roof and the ceiling.
If the measurement is flawed, it will directly impact the dimensions of other cabinets and will not give a smooth finish towards the end. It can also affect the measurements of the subsequent steps. If you are not confident in your measurement skills, you can ask for help from other family members or call for professional services.
Pro Tip: If you have uneven ceilings or walls, take multiple measurements from different points.
Build the Extension Box

Once you have precise measurements ready, start by building the extension box for your cabinets. The size and measurement of this extension box will depend on the gap measured in the previous step. So, be as precise as possible. You may skip pocket holes when building these boxes f because screws and wood glue does the work. Remember the space and measurements for related accessories such as light fixtures, etc.
Pro Tip: You should use ¾ inch plywood for building these boxes. Consider adding a face frame to enhance the look and to give these extension boxes a more refined look.
Cut and Install the Support Brackets

The next step is to check and confirm that these extension boxes are securely supported on the kitchen wall. Safely install brackets to hold the extension boxes firmly in place. Use L-shaped support brackets to ensure that the brackets fit tightly between the top of the existing cabinet and the ceiling. The brackets should be placed at 3/4th inch from the edge to allow for proper attachment of the extension box.
Pro Tip: First, mark the spots on the walls where the nuts will have to be drilled for installing the brackets. This will provide a precise location and give the work a polished look.
Attach the Cabinet Box

After installing the support brackets, the extension boxes are to be attached to the correct position. For the exact positioning, be cautious enough to refer to the measurements taken and points marked in the previous steps. This step will prevent mismatches in succeeding steps and avoid mishaps later on.
Attach the box to the ceiling-mounted support brackets using screws. Ensure the box's surface and edges align properly with the walls and the ceiling. Additionally, use screws or brad nails to fix the box to the existing upper cabinets for extra stability.
Pro Tip: Measurements should be taken at least twice to confirm their accuracy and precision. To avoid confusion, always keep track of all the readings.
Add Frame (Optional)

Adding a frame gives the newly installed extension boxes a finishing touch and enhances their look. While this optional step is optional, pine trim can elevate the appearance of the cabinets, making them look custom-made. The project budget might be higher than what you had planned initially, so be prepared to leave room for such adjustments.
Pro Tip: An additional face or trim will require extra material and precise measurements, so plan accordingly.
Install Trim and Crown Molding

Next, proceed to install the trim and crown molding. A trim and molding give the cabinet extension a polished, professional look. Start by adding small trim around the edges of the box, then proceed further, blending it with the existing cabinets. This will help to fill gaps, if any, left due to box installation. Once the trim is in place, install crown molding at the top. Use a saw to make precise cuts for the crown. This ensures a perfect fit without any hassle of cutting tricky angles.
Pro Tip: When dealing with vaulted ceilings or textured surfaces, consider removing a bit of texture using a multitool to ensure a perfect fit for the crown molding.
Install Doors (Optional)

Installing doors on the new extension boxes creates functional storage space. Depending on the cabinet style, opt for standard cabinet doors, glass-front doors, or even open shelving. Make sure the doors are hung properly. Always click photographs to check the door alignments. These extensions can be used to store additional kitchen items, so they must be working smoothly to have a great working experience.
Pro Tip: Consider hiring a professional service to custom-make doors to match the existing style and aesthetics.
Fill Nail Holes and Imperfections

Once the trim, crown molding, and doors (optional) are installed, fill in any visible nail holes and imperfections with the wood filler. This step ensures that the entire extension looks seamless and polished. If these holes are left unattended, they might become home to pests and pose problems in the future.
Pro Tip: Apply caulk to the seams where the extension boxes meet the existing cabinets. This will help fill in any missing gaps or imperfections in the corners.
Paint and Finish

Choose a high-quality paint that matches your existing cabinets and the desired look! Use a roller brush for detailed areas to ensure that the entire surface is coated properly and gives an even look.
Pro Tip: If you are unsure of the exact color code of the existing cabinets, consider taking a sample to the local store to get color matching done.
Admire Your Masterpiece
Do not miss and skip this crucial step. Many people think of doing such a project someday but do not muster the courage to act upon their dream project. So, doing a DIY project all by yourself needs appreciation. Pat yourself for it!
Conclusion
These steps will add functional storage by eliminating gaps and giving the kitchen a fresh and modern look. Adding visual height by stacking the new cabinets above the existing ones or adding doors and light fixtures—all these parameters are a sure-shot solution to significantly change the overall style of your kitchen.