ᐅ Timber frame construction: which company is reliable?

World-e schrieb:
What I meant was that some prefab house manufacturers are now also using ecological and sustainable insulation materials. Many, however, still use polystyrene on the exterior [...] I don’t know what has changed in the last two years.

The eco and organic trend reached prefab house builders about twenty years ago. Back then, you could even choose a different insulation material with the same thickness. Today, you first have to calculate whether the desired U-value is still achieved. That’s why the wall thicknesses in "eco" designs can differ by about 2cm (1 inch). In the last two years, what has changed is that the 2016 Energy Saving Ordinance replaced the 2014 version.

World-e schrieb:
There are also various belief-related disputes about this.

These are mostly a result of the current "insulation craze" and affect both construction methods today (timber frame panels and masonry). The "eco" option was quickly agreed upon—it was requested and offered, end of story. Back then, insulation was only on the inside (in timber frame prefab, and between masonry leaves in solid construction). Gluing on insulation boards, frankly of petrochemical origin, is a very recent (mis)development. The debate about insulation, over-insulation, and excessive over-insulation is truly a belief-driven conflict: facts exist, but on all sides they are in the minority.

World-e schrieb:
For me, the advantages of a local carpentry outweighed others. Others will surely see it differently. Everyone has to judge for themselves.

That’s where the advantage of local carpentry comes in: with its "small-batch production" it can easily accommodate the customer’s wishes to develop a customized wall assembly.

World-e schrieb:
I don’t know which prefab house providers offer installation cavities.

I don’t know either—what exactly do you mean by that: does your provider install conduit systems?

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

My experience: Large providers are interesting if you stick to their standard house models.
If the room layout, size, and overall concept fit your needs, you can get a house at a good price.
However, if you want to make any changes, the costs increase significantly. Anything outside the standard becomes expensive.

That’s when smaller, local companies become appealing. I agree with 11ant here—while not without a good architect, it is definitely possible to build a custom-designed house with a local firm. The advantage is that other tradespeople involved are usually local craftsmen, and they are still accessible even after the construction phase.
In my experience, heating systems ALWAYS and EXCLUSIVELY cause problems on Friday evenings, and when you have a heating technician in your village who is ready to come immediately, you will really appreciate the benefits of local providers.

But judging by the companies mentioned by the original poster, it seems they are probably looking for a general contractor (GC) with a standard program, right?

11ant schrieb:
I don’t know either – what do you mean exactly: does your supplier install empty conduit systems?

The installation layer is attached to the wall only after the house is put in place. Wooden battens are used, with the installations placed between them; the rest is insulated and covered. This way, the airtight layer is not penetrated (for example, on the exterior for outdoor lighting, outlets, etc.), since it is located after the installation layer. Empty conduits or cables are installed as part of our own work.

Climbee schrieb:
Anything outside the standard becomes expensive.

That’s when smaller, local providers become interesting. I agree with 11ant here, not without a good architect, but the execution of a custom-designed house can definitely be done with a local company. The advantage: all other trades are usually local craftsmen and remain “accessible” even after construction [...]

But judging by the companies the OP mentioned here, they are probably looking for a general contractor (GC) with a standard program, right?

“Standard” in the sense of “production homes” practically doesn’t exist anymore (unfortunately) – routines also provide security.

My reference to architectural planning was specifically aimed at the small carpenter who has little experience as a house provider. The “big players” are all experienced and can now think beyond their typical 5-meter (16 feet) grid systems.

They are typically full-service providers, mostly with their own basement construction subsidiaries. The carpenter usually acts as the consortium leader with subcontractors for all other trades – which they are probably better at the closer you build to their company headquarters.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Can you provide any facts to support your outrageous claims?

11ant schrieb:
now mostly with their own basement construction subsidiaries

For example, I completely dispute this, as well as many other things you are spouting here.

11ant schrieb:
"Standard" in terms of "production homes" no longer really exists nowadays (unfortunately) – routines also provide security.

My experience is completely different. I want to mention two more companies here: Baufritz and Sonnleitner. Both offer fixed house models; if you choose one of these and stick to the standard design, the value for money is really good. However, any small change (for example, "Could the house be built 60cm (24 inches) wider?") results in disproportionately high additional costs. Custom-designed houses were exorbitantly more expensive.

At first (also because you can find a lot more information about these companies online), we were also considering regular general contractors (GCs). We looked at their production homes and thought: oh yes, this one roughly fits in terms of size, a bit more here, a bit less there, but basically fine. And all that for under 300,000€. How great! But exactly that "a bit more here, a bit less there" deviates from the standard and suddenly the price under 300,000€ was no longer valid.