# Measure twice, we only get one

> A pane cut three millimetres long is scrap and always was. A glazier's cutting list moves every decision before the glass is touched, which is why it looks so plain.

August 19, 2026 · https://justog.club/stories/glazier-cutting-list

A ruled table: quantity, width, height, type, one row struck through in red. Beneath it, a small
diagram of how the cuts nest inside a stock sheet. At the foot, in red: *measure twice, we only
get one.*

Every other trade on a job site can fix a mistake by working harder. Glass can't.

## Why does the list matter more than the cutting?

Because the cutting has already stopped being a decision by the time it happens.

Timber that's cut short gets trimmed again. Fabric that's cut tight gets let out at the seam.
Plaster that's uneven gets skimmed a second time. A pane cut three millimetres long doesn't get
anything — it's the wrong shape of a material that doesn't compress, doesn't stretch and doesn't
take another pass. It goes in the bin.

So the trade moves all its difficulty backward, onto paper, where a mistake costs a pencil mark
instead of a sheet.

## What is a nesting diagram actually solving?

Fitting the fewest wrong shapes into a rectangle you paid for.

Stock glass comes in fixed sheet sizes, and every pane you need is a rectangle that has to be laid
out on that sheet with the offcuts kept small enough to be useless rather than wasted twice. It's
the same puzzle as [laying pattern pieces along a roll of fabric](/stories/upholsterer-cutting-plan),
with one difference: an upholsterer's mistake is expensive. A glazier's is unrecoverable, so the
diagram gets checked before the cutter, not after.

## What makes a good cutting list?

One that a second person could cut from without asking a question.

Every dimension has to be unambiguous about which way is width and which is height, because a pane
that's the right two numbers in the wrong order still doesn't fit the frame. The type column
matters as much as the size — toughened, laminated, double-glazed unit — because those aren't
interchangeable once a frame's already built around one of them. And the list is dated and signed,
because a site that's had its openings altered since the survey needs a list that says when it was
true.

## What if the list is wrong?

Then the frame is right and the glass isn't, and somebody re-measures.

The red strike-through on this hero is the honest version of that: a figure was wrong, it's crossed
out rather than erased, and the correct one sits beside it. Nobody hides a mistake on a cutting
list, because hiding it is how the same mistake gets cut twice.

## Does a cutting list work for other trades?

For any trade where the raw material doesn't forgive.

Stone masonry, tile setting and stained glass all share the same shape of problem: dimension it
once, correctly, before anything irreversible happens. Softer materials get their own version of
this discipline for a different reason — a
[stave gauge sets diameters the cooper can't adjust once the barrel's hooped](/stories/cooper-stave-gauge).
The list matters most where the material is least forgiving.

## Can the list name a real glazing firm?

Only if it's yours to name.

The table format, the QTY/W/H/TYPE columns, a nesting diagram — none of that belongs to anybody.
It's how the job gets done, the way a recipe or a knot is a method rather than a possession. A
particular firm's letterhead, job-number scheme or account details are a different matter, and
licensing those from the firm is straightforward if a real one is the point. Inventing the numbers,
as this hero does, sidesteps the question entirely and gives the wearer their own dimensions
instead of somebody else's job.

## Does it print well?

Yes — it's a ruled table and a line diagram, which is close to the easiest thing a printer sees.

Keep the grid to flat black or charcoal rule work with hard edges; anything softer starts to look
smudged rather than drawn. The red belongs to the correction, so it stays as one small hit — the struck row and the closing
line — rather than spreading across the sheet. Sand, cream and
charcoal all sit well against it, and two inks is enough.

## How do I get one made?

Describe your list at [JustOG](/) — the pane sizes, which row gets struck through, and what the
red line at the foot should say. Pick a direction, drag the crop frame, see it composited on the
real garment, and it's made to order and shipped.

Designs other people have published are in the [shop](/shop).

One row in red, and a sheet that still has to be cut correctly on the first try.