Very popular here in Austria. And they are mostly very good quality. I have friends who built one of these "Fertighäuser" (prefab houses) and even though cheaper than a custom build they are really impressive. The walls are delivered just as you describe.

https://www.liebfertighaus.at/wp-content/uploads/2019/05/Ado...

https://www.google.com/search?q=fertighaus+teile&tbm=isch

There are some efforts now being made to reduce the amount of concrete and build with more sustainable wood.

Good quality prefab panels from eastern Europe installed by incompetent foreign companies with no incentive to stand behind their work result in occasional sob stories here in Switzerland.

You get what you pay for.

Here in Switzerland, you are likely to pay through the nose for a mediocre product / service. Caveat emptor, particularly since consumer laws are weak.

There's a rather huge prefab industry here in Estonia. Starting from small pre-fab components (such as a single small wall section) to some houses that are essentially 90% completed in the factory.

If you have the foundation already done, then the assembly of the rest of the house takes around 3-5 days

Random promo video of one company: https://www.youtube.com/watch?v=KqAxoBAE2pc.

Looks pretty, but how about fire, excessive snowfall or wind, rodents and pests, flood/water leaks etc?

Well for one, if it didn't stand excessive snowfall you'd find out pretty quickly in Estonia.

What’s the price for prefab like? Their website wouldn’t say.

This is extremely common in the Netherlands. Also very well sorted out these days. My parents' company used to assemble these. A specialised contractor digs and pours a concrete foundation for the walls and once those would be cured a crane, a loader truck and a crew of maybe 3-6 people would on average have a new house ready every 3 days (walls, floors, roofs, wiring, piping), 'ready' being very close to how they're sold to individual owners.

A prefab house design will typically be replicated in several projects / cities, usually with a few customisation options. Different prefab factories have different levels of standardisation and automation. The prefab production lines I designed long ago for example used fully parametric designs to offer standard concepts sized to fit. At the time (~10-15 years ago) a novelty, by now must be pretty standard.

Sounds really interesting.

Do you have any links to learn more about your prefab designs and a company that assembles these designs?

Not in the Netherlands but in Sweden one of the biggest house makers is Älvsbyhus, you can select a base model (begin by selecting number of floors/layout, then size) and customize colors and some details online.

https://www.alvsbyhus.se/vara-hus/

Basically trailers or RLBs. We have those…

I built a house like this in US. The company is called Bensonwood / Unity up here in NH. It is not cheaper but it is faster and higher quality. From slab to dried in house in 4 days. Passive house level airtightness and insulation.

Wall assembly is zip->10 inch blown in insulation around 10inch I-Joist -> OSB -> 2x3 interior wall studs to hang your sheetrock off of and run utilities. (All pre-drilled for faster running of pex and conduit.)

You do have to do all the interior work after, though.