Saw a one-off house built near me during Covid. Extremely impressive to see the speed.50% faster construction time with only 4 weeks needed on-site.
Site works, foundation and subfloor follows traditional methods. Then you see a scaffold built to full height, but no house, which looks strange.
Crane arrived on site over a weekend, followed by trucks on Monday morning, with the house walls on the back. You could see shape of house at the end of first day. Walls complete on Tuesday evening. Then roof went on. Crane finished by Wednesday. Roof was all pre-fabricated timbers, and then traditional slate went on over the following week or so. Most of the on-site work was then indoors. In terms of 'building' work, they spent as much time on the entrance gate walls as they did on the main structure of the house.