I believe they will send out a team to digitize the job site.
The team will then create a digital twin.
The architect will map everything into this twin.
The computer system will simulate the build steps.
Robots will be brought onto the job site and get a finetuned model (if necessary) and will build it automatically.
Often nothing as cheap as humans in terms of energy consumption. I doubt LLMs will beat that energy consumption.
Anywhere a human gets involved shit gets expensive. Interestingly robots are pretty human-intensive, from design to programming and maintenance. Only at scale does the “human factor” go down and things become affordable.
Once those two layers interact, you get a whole new dimension of problems you get to deal with. The creation of yet another layer of "management" is inevitable. It's basically management all the way up.
But man, once you get a bunch them aligned and motivated the sky is the limit.