How do I choose a countertop fabricator or installer?

Take two quotes for the same kitchen, one eight hundred dollars lower than the other. The gap is usually a line the cheaper sheet leaves out, such as tear-out, disposal or the plumber. Countertops in Omaha, NE, often arrive with a scope that runs shorter than countertops omaha alone in the kitchen sets it out, with one line reading "install" and nothing behind it. Comparing the two means reading what each sheet actually covers.
Look at the actual slab

With granite, marble and quartzite, color and veining can differ from a small sample. A hand-sized piece does not show the full slab, so go to the yard and look at the one that will be cut. Quartz and porcelain are made differently, but the same habit applies. Ask which slab is tagged for the job and stand in front of it.
Seams and the route into the house

Seam placement should be settled before anything is cut. It changes how the top looks and how the pieces fit through the home. Older houses and converted Old Market lofts can have tight stairs, turns and narrow doors, so the delivery route gets checked before piece sizes are final. A long run that cannot pass a landing has to be split somewhere, and that decision belongs on paper, not on install day.
Overhangs and support
An overhang needs support suited to its length and the material. Some will need brackets or corbels, and a thin stone with a deep overhang and nothing under it is a cracked top waiting to happen. Thicker is not automatically better. Thickness should match the span, the stone and the cabinet below it.
What the written scope names
The scope should say who removes the old top, who hauls it away, and who disconnects and reconnects the plumbing and appliances. Not every fabricator includes removal or plumbing as standard, so a missing line is a cost, not an oversight. Templating should be listed too, with who attends and when it happens relative to the cabinets being final.
Details, cabinets and paperwork
Confirm in writing the edge profile, thickness, sink type, cutouts and backsplash. An eased edge, a bullnose and a waterfall edge cost different amounts and cut differently. A good installer checks the cabinets for level and explains any shimming or repair before setting stone. Ask for care instructions and warranty terms in writing as well, since requirements differ between granite, soapstone, laminate, solid surface and butcher block, and between manufacturers.