By Greg Allan, tradesman and creator of Data First Coaching
Why doesn't better cutting in the workshop fix the margin leak?
Most stonemasons treat slab waste as a workshop skill, something solved by better nesting, careful templating or a sharper fabricator running the CNC. That is a yard fix for what is actually a quoting problem. However well a slab is cut, the margin on that job was already set the moment the quote went out, long before anyone measured, templated or picked up a saw.
A kitchen company brings a job in, the stonemason quotes the benchtop at a standard rate per square metre, wins it, and the slab comes off the rack. The offcut that's left over, too small for the next job, too awkward a shape to use on a splashback, was never priced as a cost of the job. It's simply absorbed, job after job, and nobody notices because the markup on the invoice still looks right.
Where does the real cost of offcuts actually show up?
The real cost of offcuts shows up in the gap between what a job looked like it earned on the quote and what actually lands in the bank once the slab is paid for, the fabrication labour is covered and the install is done. That gap is gross profit margin quietly draining away, and it usually stays invisible until the owner checks the one number that tells the truth: margin on the slab actually consumed, not the net benchtop measured.
A natural stone slab with heavy veining, a sandstone block with a flaw running through it, or a rushed template taken on-site can all turn a straightforward job into one with a far bigger offcut than expected. None of that shows up as a single bad decision. It shows up slowly, across a month of invoices and polishing bays full of leftover pieces, as the difference between the margin the quote promised and the margin the bank statement shows.
How do you price the slab you actually use, not just the benchtop you deliver?
You price the slab you actually use by building a waste allowance into every quote, the same way you'd price in fabrication labour or delivery, instead of charging only for the finished benchtop and hoping the offcut takes care of itself. That means your gross profit margin gets checked and protected at the moment you quote, not discovered weeks later when the bank balance doesn't match what the job looked like it earned.
Think of it as pricing the whole piece of stone a job takes to produce, not just the clean section that ends up on the bench. An engineered stone slab with a difficult cut pattern, or a natural stone piece where the veining dictates where you can cut, might use more of the slab than a straightforward rectangular benchtop. If that difference isn't built into the price, the stonemason is effectively donating the cost of the offcut to the customer.
What changes when AI agents take over the waste calculation on every quote?
AI agents, which here means software that does a job the way you would, using your prices, your wording and your rules, can check every quote against your own waste and margin numbers before it goes out. A job that's likely to chew through more slab than usual gets flagged and priced accordingly, instead of relying on whoever happens to be quoting that day to remember to add a buffer.
This is data first thinking rather than a feeling that pricing is probably fine because the markup looks right. AI agents built on your own job data can hold the waste rule on every quote, whether it's a benchtop for a kitchen company, a cladding job for a builder, or a memorial where the polishing and lettering leave almost no room for error. The rule doesn't get forgotten on a busy Friday because someone's rushing between the workshop and a site measure.
Does this change how you price builders and kitchen companies versus memorials and restoration work?
Yes, because the waste a job produces is never the same across the work a stonemason takes on. A straightforward benchtop install for a kitchen company might waste far less slab than a sandstone restoration piece cut to match an existing profile, or a memorial where the final polish leaves little margin for a miscut. Treating every job with the same flat waste allowance means some jobs are overpriced and others are quietly losing margin.
Builders and kitchen companies tend to want predictable pricing on regular benchtop and splashback runs, where the waste pattern is more settled and easier to allow for. Restoration, cladding and paving jobs with irregular cuts, or memorial work with tight polishing tolerances, carry a less predictable waste cost, and pricing that job type the same as a standard benchtop run is where a stonemason can lose margin without ever seeing a single bad cut in the workshop.
How does Data First Coaching approach this?
Data First Coaching starts from the stonemason's own job and finance data through the Trade Business Intelligence, not from a guess about how much slab a job should use. Greg Allan looks first at where gross profit margin actually sits against what each quote promised, job type by job type, because that gap usually points back to the quote, not the cut. From there the coaching finds where a waste allowance is missing or wrong, and where an AI agent could hold that rule on every quote instead of leaving it to memory. The how, the building of that system, is worked through inside the Academy, with members, because the Trade Business Intelligence is powered by every member who is open minded, innovative and willing to share what they learn.
