Differences between Custom & Prefab Cabinets
1. Size: Custom cabinets are measured to the millimetre and designed to your preferred layout. Prefab cabinets come in preselected "standard" sizes, which may not fit exactly in the space you desire.
2. Cost: Custom cabinets tend to range higher in cost vs. prefab.
3. Quality: Custom cabinetry tends to rank higher in quality as materials are hand picked, and handcrafted to your specifications. While prefab are mass produced.
Have a look and see if you can tell the difference: http://www.finishedbasement.ca/finished-basement-ideas/basement-kitchens-cantinas/