By Greg Allan, tradesman and creator of Data First Coaching
Why does a glazing business look busy and still have no profit left?
Most glaziers quote per pane, per screen, per sheet of safety glass, and each line looks fine sitting on its own. The trouble is that none of those lines carry the cost of the glass that cracked on the measure, chipped on the cut, or broke on the drive to a commercial install. A business can run flat out on reglazes, shower screens and shopfront panes and still finish the quarter with almost nothing left, because the cost of what broke was never charged against the job it belonged to.
A glazier does not usually see this while mid job. The ute is loaded, the install is booked, the next measure is waiting. It is only when the owner stops and actually looks at the numbers properly, rather than at how busy the week felt, that the gap between the quoted margin and the real one shows up.
Why does a cracked pane or chipped mirror never show up as the cost it really is?
A breakage gets treated as a one off in the moment and then buried as a general overhead line, instead of being booked as a direct cost of sales against the specific job that broke. That is the root of the problem: the quote still says the same healthy percentage, but the glass that was paid for and never billed has quietly disappeared from the picture.
Picture a glazier who quotes a run of double glazing replacements and shower screen installs for the week, each one priced at a margin that looks solid. One toughened pane cracks on the cut, one mirror chips in the van, one balustrade panel arrives from the glass supplier with a flaw and needs reordering. None of that gets attributed to the jobs it cost. It sits in overhead, invisible, while the invoices still read like every job made money.
A single bad week of breakages and write offs can cancel out a clean run of profitable installs entirely, and the business only sees it when it looks at the quarter rather than the week. The lead time to get a replacement sheet from the supplier adds another hidden cost too, in delayed invoicing and crew sitting idle, and that cost rarely gets tied back to the job that caused it either.
What number actually tells a glazier where breakages are eating margin?
The number that tells the truth is gross profit margin measured job by job, with every breakage, reglaze and replacement sheet costed against the specific job it happened on, not folded into a general materials or overhead line. That is the figure that shows whether a quoted margin of around thirty percent is actually holding up once the glass that broke is accounted for.
This is different from checking the bank balance or feeling busy. A glazier can be fully booked on commercial shopfront work and emergency boarding jobs and still be running thin margins if breakage costs are never attributed to the jobs that caused them. The quoted margin on paper stays wrong for a long time, because supply disruption and breakage replacement do not announce themselves on the profit and loss statement, they just quietly erode what looked like a healthy number.
How can AI agents stop breakage costs disappearing into overhead?
AI agents, which are simply software that does a job the way the owner would, using the owner's own prices, wording and rules, can be set up to catch a breakage at the point it happens and attribute its cost straight to the job it belongs to, rather than letting it drift into a general ledger line where nobody ever looks at it again.
For a glazier this matters because the moment a pane cracks on the cut or a sheet arrives damaged from the glass supplier is the moment the real cost of that job changes. An agent working from the owner's own job and finance data can flag that change against the job straight away, instead of the owner finding out at the end of the quarter when the numbers are already old. That is what a data first approach to the office side of a glazing business looks like: the information goes in at the point of breakage, not after the fact.
Should every glazier track breakages against the job that caused them?
Yes, because a breakage is a cost of sales, not an overhead line, and treating it that way is the only way the quoted margin on a reglaze, a shower screen or a shopfront install matches the margin the job actually delivered. Without that link, every quote keeps using a margin figure that is quietly out of date.
AI agents can hold this tracking in the background across measures, installs, insurance work and emergency boarding jobs, so the owner is not relying on memory of which week went badly or which install ran over. The owner's crew still measures, cuts and installs the same way. What changes is that the real cost of every cracked pane finally lands against the job it came from, where the margin can actually be protected and grown, rather than discovered too late.
How does Data First Coaching approach this?
Data First Coaching, built by Greg Allan, starts from the glazier's own job and finance data through the Trade Business Intelligence, rather than from a conversation about how busy the business felt. For breakages, that means looking at where glass cost sits against each job, not the quarter, to find whether a margin problem is really a pricing problem, a supplier lead time problem, or a measure and handling problem further back in the job.
As Greg puts it, “when we don’t actually zoom out, look at the financials, that’s where you lost all of the profit.” The how of setting this up is worked through inside the Academy, with members, because the Trade Business Intelligence is powered by every member, for owners who are open minded, innovative and willing to share what they learn with each other.
