Purpose
Fundamentally, design is a process in which you make a series of choices to fulfil a purpose. You doubtless already have a purpose, but expressing it in words makes it a more effective tool. For custom cabinetry, a purpose will usually revolve around storage and aesthetics. A custom kitchen cabinet, for example, may have the purpose of storing cups and matching the kitchen interior. You can use this to make design choices for your custom cabinetry that suit that purpose. To further refine your decision-making, a purpose can also include restrictions such as budget or size. Overall, a purpose serves as a guide for your custom cabinetry design.

Context
Context is another important part of custom cabinetry. Your cabinet doesn't exist in a vacuum. Both stylistically and functionally, the surroundings of a cabinet have a significant impact on the success of its design. A cabinet that fits perfectly in one context may be lacking in another. Your custom cabinetry needs to account for the available space, the aesthetic style of the room, and any potential hazards.
Accounting for the available space requires accurate measurements. While your cabinet needs to be small enough to fit into the space, it also needs to be big enough to take advantage of the space.
As for the aesthetic style of the room, your custom cabinetry should match it. You want your custom cabinetry to contribute to the aesthetic style of the room rather than detract from it. The idea is to have the stylistic features of your design relate in some way to the stylistic features of the rest of the room. Common examples of stylistic features are materials, symbolism, colour, and form.
Lastly, potential hazards can affect the wear and tear of a cabinet. An example of a potential hazard would be the humidity of a bathroom. A cabinet that would work elsewhere could degrade in a bathroom if it isn't water-resistant.
Materials
Your choice of materials affects all other parts of the design. Each material has its strengths and weaknesses. The best materials for your custom cabinetry are the ones that suit your purpose. The most popular materials for custom cabinetry are solid wood, stainless steel, particle board, plywood, MDF, and laminate. On top of these, materials like metal or glass may also be used in certain parts of a cabinet. For stylistic consistency, it's often a good idea to use materials that are used elsewhere in the room. Sometimes, however, other materials are better suited to your purpose.
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