Typically, a big box store requires you to provide them with all your measurements. If you are a master of the tape measure, then that should work for you. Just remember, YOU are responsible for ordering new cabinets if they don’t fit.
A professional who has conducted an onsite evaluation of the space may offer other options for layout and spacing of cabinets and appliances. The big-box store is just going to place cabinets and appliances where you tell them. A professional can assess the placement of load and non-load bearing walls and any modifications on your budget.
When onsite, the pro can evaluate your tastes and make recommendations for items such as cabinets, countertops, and tile to match your décor. The big-box store only wants to sell you cabinets, appliances, countertops, and plumbing fixtures. They do not evaluate plumbing, electrical, or carpentry modifications to make your project a reality. If you have a historic home, choose a certified professional kitchen designer trained to deal with an old house’s idiosyncrasies.
The main point to take away is that “you get what you pay for.” If you’d like to discuss what Leo Lantz Construction can do for your kitchen, take a look.