Countertops are the clearest illustration of why "how accurate is it" is the wrong question, and "accurate enough for what" is the right one.
What templating does
A countertop templater uses a laser or photogrammetric system on a fixed setup to capture the exact cabinet tops, in place, to roughly a sixteenth of an inch. It accounts for the wall that is not straight, the cabinet run that is not level, and the corner that is not 90 degrees — because a stone top has no tolerance to absorb any of that.
That is a fabrication measurement. It is taken after the cabinets are installed, for one purpose, and it is the right tool for that purpose.
What a scan does
Scanstead measures the room to about an inch: wall runs, corners, openings, heights. From that you get countertop linear feet and square footage good enough to price the job — which is the question being asked months before anybody templates anything.
The two questions
- "What will this kitchen cost?" — asked at the bid, needs area and linear feet within a few percent. A scan answers it in three minutes.
- "Cut the stone to these dimensions." — asked after install, needs a sixteenth. A template answers it, and nothing else should.
Trying to bid with a template means paying for a fabrication measurement before you have a contract. Trying to fabricate from a scan means a seam that does not close.
Where the scan helps the templater
Sequence, mostly. A scan at the bid stage gives the fabricator the layout, the slab count estimate, and the seam locations to plan around — which is enough to quote and to order material. The template still happens, on schedule, at the right moment.
The general rule
Scan to price it. Template to cut it. The same relationship holds for cabinets, millwork, and replacement windows.
Accuracy is not a score. It is a match between the tolerance you have and the tolerance the job needs.