Evaluation of two providers or construction services

Hello everyone! On the way to our prefabricated house, we received/compiled two offers yesterday.

First from the company Schwörerhaus and then from an acquaintance (father of a friend) of the company Schwabenhaus. Now it is such that the latter suggested bringing the offer from Schwörerhaus with us and he tries to match everything and give us a better price. But beware: With a brine-water heat pump (geothermal with probe). I will go into the details shortly and would like to hear your assessment exactly on this.

I will try to keep everything as clear as possible. The comparison is always based on information from the construction and performance description of company Schwö. with company Schwa.

The most important point -> Heating

Schwö: Air heating with LL heat pump + additional heating elements at the outlets.

[*]Air heating: heat recovery 134 BP-HK
[*]Hot water via additional LW heat pump with heating rod (2.5kW)
[*]I am not so enthusiastic about it!
[*]Also possible here LW heat pump with underfloor heating (extra charge) or SW heat pump (geothermal with probe) in combination with the air heating (of course also extra charge)
[*]Surcharges have been requested

Schwa: SW heat pump geothermal (probe) with underfloor heating.

[*]Hot water also via this system
[*]Annual performance factor given as 4.7 (device from Waterkotte)
[*]Here the 5000 euro bonus is also often mentioned, which according to a quick Google search everyone would get anyway

Both already have automatic ventilation included

If that was all, our decision would be clear and straightforward: Schwabenhaus. However, there are also disadvantages, because somehow the “same price as with Schwörerhaus” has to be earned back and we believe this happens in the following things. I am unsure about those and especially here I ask again for your assessment.

Exterior and interior walls

Schwö: Exterior (total thickness of 32cm)

[*]Insulation of 240mm, inside with wood fiber board + drywall
[*]Outside massive building material “Cospan” with additional diffusion-open layer
[*]Plaster carrier: 40mm
[*]U-value: 1.5

Schwa: Exterior (total thickness: not explicitly specified)

[*]Insulation of 160mm, inside directly gypsum fiberboard
[*]Outside also only gypsum fiberboard
[*]Plaster carrier: 100mm as “full thermal insulation board”
[*]U-value: 1.4

Inside it is similar: With Schwa. the gypsum fiberboards (12.5mm) are directly on the wooden construction; with Schwö. there are wood-based panels (16mm) behind the drywall (9.5mm). I am somewhat skeptical about Schwa.’s version especially regarding loads. Also, I am not quite sure about sound and insulation. Also, with the ceilings there always seems to be slightly something “missing” in comparison….

The following details are also missing for company Schwa in the construction and performance description. Since I am not an expert, I cannot really assess these well, maybe you can also help here:

[*]No storm brackets
[*]No KFW confirmation + blower door test indicated in the construction and performance description
[*]Transport costs of the house, assembly crane, the assembly itself, scaffolding, residual material container including disposal, construction site toilet, registration and completion notification of the house connections are missing in the construction and performance description of Schwa. (explicitly listed for Schwö.)

All these questions have of course also already been addressed to the Schwabenhaus advisor. However, I assume that if something is not in the construction and performance description, it is simply not included in the scope of services. If you want it => extra charge…. or take care of it yourself.

How would you assess this whole situation? What would be important to you or what does not seem too bad (e.g. the matter with the walls)….. or also what would you rather not recommend?

Thank you very much for your time and advice!

Request it, have it recorded in writing what is missing. Regarding the wall construction: Schwörerhaus is probably better for hanging cabinets, but I cannot say whether the other one from Schwa also works in practice. The diffusion-open layer at Schwörerhaus is of course good, certainly prevents mold and possibly facade algae growth, if it really does what it claims to do. Breathe.

Thank you for your assessment!

A few more details I forgot:

[*]Both houses as Kfw55 houses
[*]Price should be the same for both, so it was removed from the calculation

If all the additional items later mean a higher price for Schwa., we tend to lean more towards Schwö. We have the feeling of having a bit more quality, durability, or "substance" there :-/
And if possible, to get the combo SW-WP + "air heating" there

Hello Wissi,

how did your research turn out, especially regarding the open questions in the 1st entry, keyword open, undefined points at Schwabenhaus?

We ultimately decided on Schwörerhaus but against the air heating. Instead, we installed underfloor heating with an air-water heat pump.

Overall, we found the package from Schwörerhaus more appealing.