Glass measuring: the remake that eats the job

Most trades can adjust a material on site. Timber gets cut, plasterboard gets scribed, tile gets trimmed.

Glass gets remade. A panel three millimetres wide is a new sheet, a second delivery and a customer with an open hole in their wall.

A measurement is a method, not a number

Two glaziers measuring the same opening should return the same figure. That only happens when both follow the same written method.

The method names where to measure, how many points, which deduction applies and what gets recorded. Without it, a measurement carries whoever took it.

1. Three points on each dimension, top, middle and bottom, and the smallest one wins.
2. Square checked on both diagonals, because an out of square opening needs a different allowance.
3. The deduction applied and written down, rather than held in somebody's head.
4. A note of what the panel sits in, since the channel decides the allowance.

Photograph the opening while standing in it

A photograph answers the questions that arrive after the measurement: which way the frame runs, what the reveal looks like, whether the sill is level.

It also settles the remake argument. A panel that did not fit either came from a wrong measurement or a changed opening, and only one of those is the glazier's.

Read the order back before anything is cut

The most expensive mistake in glazing is a transcription error, not a measuring one. A figure taken correctly and typed wrongly costs exactly as much.

A second person reading the order against the measurement sheet takes two minutes and catches most of them. On a large order that check pays for itself immediately.

Know what a remake costs, per panel

The sheet is the small part. The delivery, the second visit, the make good and the job held open all cost more than the glass.

A business that has costed a remake properly measures differently, and stops arguing about whether a check is worth the time.

Toughened glass has no second chance

Annealed glass can sometimes be recut. Toughened cannot, so an error on a toughened panel is a total loss of that sheet.

The check before a toughened order deserves more attention than the same check on float, and most glaziers treat them identically.

Record every remake with its cause

Four causes cover nearly all of them: a measurement, a transcription, a changed opening and a supplier fault. Each has a different fix and a different owner.

A quarter of that record usually names one cause carrying most of the cost, and it is rarely the one the business expected.

Lead time is part of the quote

Toughened and laminated units come from a processor on their own schedule. A customer told the date at quote time plans around it.

The same customer told after the measure treats the wait as a delay the glazier caused.

Board up work needs its own price

A broken shopfront needs securing today and glazing next week. Those are two attendances, two crews and two different urgencies.

A board up priced separately lets the customer choose it knowingly. Folded into the glazing price it becomes a free visit nobody costed.

The same applies to out of hours attendance, which carries a premium every other trade charges and glaziers often absorb.

What to change first

• A written method sets where to measure and which deduction applies
• Three points on each dimension, with the smallest one winning
• Both diagonals get checked, so an out of square opening carries its own allowance
• The opening gets photographed while somebody is still standing in it
• A second person reads the order against the sheet before it is cut
• Every remake records its cause, and the quarter names the biggest one