ᐅ Looking for a construction company in the Greater Stuttgart area!

Stuttgart0711 schrieb:

the cardboard box with particleboard walls and meatloaf

what is that supposed to be?

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

No idea, you tell me.

We have reached an exciting point because we are currently also considering the building material. More on that later, but first, an update.

I will summarize the experiences we have already shared – see post #86 for details.

Prefabricated House / Timber Construction

• Bittermann & Weiss -> Received an offer | the price is about 20,000 Euros above the previous average. However, many special features are included, such as design elements, etc. Currently, we are leaning more towards a solid house. I can pass on to others that B&W really put a lot of effort into this, and the offer is quite detailed and transparent. You receive your own plans and, as mentioned, a detailed price breakdown with individual prices. Initially, the price was very high, but many special features were included that we did not need and later removed. So don’t be alarmed by the initial price.
• Talbau Haus -> Excluded | Reason to follow
• Hanse Haus -> Excluded | Overall impression / gut feeling
• Bien-Zenker -> Excluded | due to differences
• Prefabricated House Weiss -> excluded
• Schwabenhaus -> excluded/withdrawn
• Albert Haus -> put on hold

Solid House Providers

• Haus der Handwerker -> Received an offer | so far the cheapest offer regarding the equipment. Construction with 24cm (9.5 inches) T16 bricks and 14cm (5.5 inches) external thermal insulation composite system (ETICS)
• Hauser Massivbau -> Received an offer | the price is slightly below the previous average. The standard equipment looks good. Will definitely be shortlisted. Construction with Liapor prefab walls.
• Köhler Wildberg -> Meeting took place | we were once again shown how the price is generally composed with very good transparency. However, no statement can yet be made about our building project without architectural planning. We currently have a good gut feeling here, apart from the price issue. Construction with Ytong PP2 36.5cm (14.4 inches) exterior and calcium silicate bricks inside.
• AWS -> Received an offer & excluded | price is about 50,000 Euros above the average price, adjusted for equipment, etc. Unfortunately excluded for this reason, even though the quality is certainly very good, and contact was positive. Construction with Poroton bricks (e.g., Thermoplan T8 or S8) and interior walls made of 10cm (4 inches) gypsum wallboard (bulk density 1,200 kg/m³)
• U-Haus -> Offer still pending | construction with 36.5cm (14.4 inches) aerated concrete
• FERMO -> excluded – clearly too expensive
• Härtter Renningen -> rejection by Härtter due to capacity issues

Currently, we are considering three providers with whom we have a good gut feeling. Aside from the final decision based on gut feeling, price, etc., we have two providers with completely different building materials and concepts. I have tried to evaluate the building materials objectively to determine which option is better for us. However, I can’t seem to reach a conclusion. In general, I am open to an Exterior Insulation and Finish System (EIFS), so I have no reservations about using polystyrene.

Hauser
Exterior: Liapor precast wall 14cm + 17cm polystyrene exterior insulation
Interior: Liapor precast wall 14cm (possibly partial precast concrete wall if structurally required)
Foundation slab 25cm (10 inches)
Clear structural height 2.67m (8 ft 9 in) – finished ceiling height approx. 2.45m (8 ft) (13cm (5 inches) suspended ceiling for electrical installation)

Advantages:
+ High wall mass providing good sound insulation (unfortunately no exact data available)
+ Exterior wall about 5cm (2 inches) thinner (31cm / 12 inches), but unclear if that really makes a difference
+ Better thermal insulation due to EIFS? (unfortunately no data available)
+ Suspended ceiling allows for later modifications
+ Lower tolerance for errors because of factory prefabrication with corresponding computer and measurement technology

Disadvantages:
- Does the high wall mass cause problems with later modifications or drilling holes?
- Mandatory suspended ceiling results in slightly lower room height
- Some reports mention possible thermal bridges at joint edges of the precast elements
- Exterior polystyrene insulation could be susceptible to algal growth?
- Use of double-glazed windows only (overall U-value 1.0)?

Köhler (and U-Haus similar)
Exterior: Ytong aerated concrete ThermStandard PP2-0.35 with 0.09 lambda
Interior: Silka calcium silicate brick
Foundation slab: 22cm (9 inches)
Clear structural height: 2.65m (8 ft 8 in) – finished ceiling height approx. 2.50m (8 ft 2 in)

Advantages:
+ High internal mass providing good sound insulation
+ Proven construction method and materials
+ Slightly higher room height

Disadvantages:
- Worse sound insulation in exterior wall (47.5 dB), although windows might be the main issue here?
- Some reports of "crumbly" building material— is this really the case? Could this cause problems when drilling holes, etc.?
- Potentially higher margin for error due to on-site construction

Have I missed any pros or cons or possibly assigned them incorrectly?
As mentioned, I really want to first try to find objective aspects and then try to evaluate which building material or construction concept is better for us.

erazorlll schrieb:

(unfortunately no data available)

erazorlll schrieb:

(unfortunately no data available)

erazorlll schrieb:

but does that really help?

You’ve already made your decision anyway... you list the above-mentioned points as advantages even though you yourself say you have no idea or that no data exists. For the competitor, you list values like decibels (dB) as a disadvantage, even though a proper comparison with houses isn’t possible... why? What are you trying to achieve with that?
Therefore, I refer back to the first sentence: you’ve long since made your decision, no matter what you say now.

We had similar considerations. I don’t want to take the decision away from you, you need to make that yourself, but here’s some additional information:

Regarding sound insulation, take a look at this table: Sound Insulation Exterior Wall Ytong

You can see that it is primarily, almost exclusively, influenced by the windows. For a better result, you can easily choose PP4 with a bulk density of 0.50 instead of PP2 with 0.35, which already provides a noticeable improvement. With that, you are also significantly better off than Poroton T9. Whether U-Haus offers P4 or an equivalent, I would doubt it. As far as I know, they only have their own large-format blocks with P2 0.35.

Poroton is crumbly as well, but I find the styrofoam issue with Liapor more problematic, especially for exterior use with special anchors, spacers, etc. If Hauser had monolithic Liapor for the exterior, it would have been our choice.