For many large steel structures there is a strategic choice to make before production even starts: assemble as much as possible in the workshop, under controlled conditions, or complete the assembly on site. Each has different implications for time, quality and cost.
The advantages of workshop assembly
In the workshop, with fixed equipment and controlled conditions, welding and alignment precision is generally higher, and processing times are more predictable because they do not depend on weather or cramped site space. The risk is that the assembled structure proves too large or heavy to transport.
When on-site completion is unavoidable
Structures exceeding transport limits, or that must adapt to the site's own tolerances — a wall not quite square, an irregular space — necessarily require completion in place, with all the additional variables a site brings compared with a controlled environment.
A quote that reflects the choice made
On-site installation time for a structure pre-assembled in the workshop is generally lower than for one assembled entirely in place, but transporting large elements can require permits or special vehicles at additional cost. The quote should state explicitly which approach was chosen and why, rather than leaving it implied.