From brief to build.

A construction drawing doesn’t appear fully formed. It travels a surprisingly long way from a rough idea to something a plumber or electrician can actually build from on site. Let’s follow one.

Stage 01 · Where it startsThe brief

Everything begins with what the client needs: the job, the constraints, the budget and the deadline. A good designer asks questions now — because a misunderstanding here becomes an expensive mistake later.

Stage 02 · Know the siteSurvey & information

Next you gather existing drawings and survey the site — real measurements, what’s already there, where things run. You can’t design what you haven’t measured, and assumptions are what get you caught out.

Stage 03 · First passConcept

Now the rough layout: where the plant goes, how the pipework or cabling runs, a couple of options for the big decisions. It’s meant to be changed — better to move a line on screen than a boiler on site.

Stage 04 · Playing nicely with othersCoordination

Mechanical, electrical and plumbing all have to fit around the building’s structure — and around each other. Designers coordinate to catch clashes (two things wanting the same space) before they reach site. The drawing changes a lot at this stage.

Stage 05 · Getting it rightDetailing & checking

Then in goes the detail — sizes, references, notes — and a senior designer checks it before it goes anywhere. Nothing is issued on one person’s say-so.

Stage 06 · Out to site — and backIssue & revisions

The drawing is issued with a revision letter. On site, reality bites — something changes — so it’s revised and re-issued. At the very end comes the as-built: the drawing updated to show exactly what was installed.

So…Why follow one drawing?

Because it shows you the whole design office in miniature — every role, every check, every handover. Watch one drawing travel from brief to build and you understand what CAD is really for.