A steel drawing costs very little compared to the steel it describes. That is why poor detailing gets expensive so quickly. A mistake takes a few minutes to make on screen and a lot more to fix once the material has been cut, drilled and loaded onto a truck.

Most fabricators know this from experience. A missing edge distance, a bolt hole a few millimetres out, a beam that clashes with a brace nobody spotted. On the drawing it looks minor. In the shop or on site, it stops work.

Where the cost shows up in fabrication

Shop drawings are the instructions the shop floor builds from. When they are clear and correct, the fitter and welder just get on with it. When they are not, people stop and ask, or worse, they guess.

Rework is the obvious cost. A member drilled to the wrong pattern has to be plugged, re-drilled or scrapped, and none of that was in the original estimate. Less obvious is the time lost to small interruptions: a foreman walking to the office to check a dimension, a drawing sent back for clarification, a revision that arrives after the piece has already been cut. Over a project these add up, and they rarely get logged as a detailing problem even though that is where they began.

Quantities matter too. If the material list is off, purchasing orders the wrong amount. Too little means waiting on a top-up order. Too much means offcuts and stock sitting in the yard.

Waste is mostly decided before the saw starts

Steel waste often gets blamed on the shop, but a lot of it is set earlier. Standard member sizes, sensible splice locations and consistent connection types let the shop nest and cut efficiently. Detailing that treats every connection as a one-off creates more cut lengths, more setups and more remnants.

Then there is scrap from outright mistakes. Every piece cut to the wrong length is material you paid for and cannot use. At current steel prices, that is real money.

Erection is where errors get expensive

A fabrication mistake costs hours. An erection mistake can cost days, because you have a crane, a crew and often a schedule with penalties attached.

When a beam does not fit, the options on site are all poor. You can modify it in the field with a torch or grinder, slot the holes, add shims or send the piece back. Each option holds up the crew behind it, and if the piece is part of a sequence, everything after it waits too. Crane hire is charged by the hour whether it is lifting or standing idle.

Good detailing plans for this. Piece marks are clear and match the erection drawings. Weights are correct, so rigging is planned properly. Bolt types and lengths are specified. Connections are checked against the actual erection sequence, not just against the model in isolation.

What good detailing looks like in practice

There is no magic in it, just discipline:

• Models are coordinated with architectural and MEP information before drawings are issued, so clashes are found on screen rather than on site.
• Every drawing is checked by someone other than the person who made it.
• Questions to the engineer or contractor go out early as RFIs, not after fabrication has started.
• Revisions are tracked, and the shop always knows which drawing is current.
• Material lists come straight from the model, so drawings and quantities agree.

None of this is new. What separates good detailers from average ones is that they do it every time, including when the deadline is tight.

Choosing a detailing partner

Turnaround time gets most of the attention when fabricators pick a detailer, and it does matter. But a fast drawing set full of errors ends up slower than a careful one. Ask about the checking process. Ask how RFIs are handled and how many revisions a typical project needs. Ask which standards they work to, because AISC detailing is not the same as Eurocode or Indian practice.

At Telge Projects, we detail steel and precast for clients across the US, Australia, Europe and India, and the same lesson keeps repeating. The hours spent checking a model before release are the cheapest hours on the whole project.

If you are looking back at your last few projects and wondering where the time and money went, the drawings are a good place to start. Get in touch with our team to talk about your next project.