ᐅ Seeking a Prefabricated House Builder in Augsburg

Created on: 13 Feb 2022 11:29
S
selcuk55li
Hey everyone,

I was really lucky to get a plot of land of about 320m² (3445 sq ft) from a municipality near Augsburg at a very favorable price, where the current market value should be about three times higher.

We plan to build a house within the next three years, but we’re not sure yet how, where, or what exactly. At the moment, we lean towards a prefabricated house because it supposedly means less stress, as everything comes from a single source, and it might also be cheaper and more affordable than a solid (brick-and-mortar) house.

We’ve already had an initial consultation with a traditional solid house builder, and with my desired specifications of
- 2 full floors (excluding the roof)
- 3 bedrooms on the upper floor
- possibly with a basement that must be completely waterproof and protected against upward water pressure according to the development plan (the builder said the basement alone would cost around 60,000 to 80,000 euros)
the price is significantly over half a million euros.

I plan to schedule appointments with several prefabricated house suppliers in the Augsburg area (radius about 250km (155 miles)) in the coming months to hear what they have to offer.

In the end, I’m not asking for public recommendations for house suppliers here (maybe privately via PM), but rather I want to approach everything correctly and avoid unnecessary stress. I’m sure many future homeowners would wish for that.

It could be helpful if people shared their own mistakes here and explained how they would have done things better. That would benefit everyone planning to build in the future.

Personally, from my current research, I find the company Town & Country interesting because they build solid houses and are reportedly affordable. I might also have been influenced a bit by a Galileo documentary.
I also find the block construction method from Dennert appealing, as it looks very stable and you don’t see wood sticking out everywhere during construction.

What puts me off a little is seeing so much wood in prefabricated houses. I somehow associate that with it not being stable over many years. Is that just a prejudice?

My first questions are:

During the few days or months that the house is being built, should an external surveyor/inspector be hired to periodically check on the construction and provide feedback?

Are there any prefabricated house suppliers that deliver truly turnkey homes? Meaning you only need to bring in your furniture and belongings. Ideally, this would also include outdoor features like a terrace, paving stones, fence, etc.
K a t j a14 Feb 2022 11:33
familie_s schrieb:


20m (66 feet) on the eastern/western edge
16m (52 feet) on the northern/southern edge

If that is correct, it would definitely be possible to plan a detached house.
S
selcuk55li
14 Feb 2022 11:41
K a t j a schrieb:

Wow, no, no one wants to read that. Maybe there is a summary with a recommendation for the foundation somewhere near the end. That would be interesting. Perhaps it’s not included because the report was not prepared specifically for your plot, but for the entire development area and for a different purpose.

So, I found a summary of the soil report. It’s quite long, but I’ll paste it here. I didn’t find anything stating that it applies exclusively to my plot. So, it seems to be a general or rough assessment.

7 CONCLUSIONS
This report compiles and explains the results of the field and laboratory work related to the planned construction measures in the development area “Am Weberanger” at the northern edge of Mühlhausen in the Affing municipality. Geotechnical and hydrogeological information was provided for the design of sewers and road surfaces as well as for the infiltration of uncontaminated surface water. Additionally, details regarding the foundation of the planned bridge over the Friedberger Ach river were included. The chemical contamination of anthropogenic fill material and naturally occurring soils was documented and evaluated based on several representative investigations.

The primary aim of the report was to prepare relevant subsurface data on-site for the planner by describing the soil layers, dividing them into homogeneous zones, classifying soil types, and giving physical soil parameters.

Overall, average geotechnical but mostly challenging hydrogeological conditions are expected due to highly permeable Quaternary gravels and potentially high groundwater levels, as well as the proximity to the Friedberger Ach.

When installing sewers, even a slight contact with the groundwater will require very high volumes of water management and elaborate dewatering measures, possibly including impermeable enclosures. It is therefore recommended to set sewer installation depths, where possible, above or at most around the design groundwater level for the construction phase.

For the planned bridge over the Friedberger Ach, a deep foundation (such as sheet pile or bored piling foundation) is recommended due to the difficult hydrogeological conditions. After the final design is available, the geotechnical and hydrogeological data should be reviewed and refined or supplemented for the specific structure. Additional investigations and evaluations may be necessary during further planning and construction.

Regarding road construction, taking into account planned earthworks, additional soil replacement below the subgrade level is likely needed only along Anwaltinger Weg to ensure required strength conditions (Ev2 modulus) at the subgrade. It was also recommended to delay the installation of the asphalt surface layer at least in this section, or ideally throughout the entire area, until after the houses have been built, to accommodate settlement and reduce wear.

Surface water infiltration is possible in the Quaternary gravels of the planned development area, considering the permeability of the soils. These gravels mostly have high permeability, which, combined with relatively high groundwater tables near the surface, results in short retention times and potentially insufficient purification of the infiltrated surface water. This must be addressed by technical measures to increase retention time and improve treatment performance through suitable structural solutions. After planned earthworks raising the ground level by 1.0–2.5 m (3–8 feet) and thereby increasing the groundwater table depth, surface water infiltration also appears feasible in this context. However, the installation of an emergency overflow with a permanently free draining outlet is mandatory for any infiltration facility.

The information in this geotechnical report is based on localized soil investigations; deviations in subsurface and groundwater conditions, as well as chemical concentrations, outside these investigation points are possible. Therefore, all excavation and foundation works should compare actual soil conditions with this report’s findings. If deviations in the subsoil are found beyond investigation points or if there is any doubt about soil and foundation conditions, a geotechnical expert should be consulted.

At the time this report was prepared, the referenced working documents were available. Since the geotechnical expert may not be aware of all relevant planning and construction details, this report does not claim completeness regarding all soil mechanics particulars. Additional investigations and assessments may be necessary during further planning and construction, especially for the planned residential buildings or other structures. As no detailed construction plans existed at this time, it may be necessary to further specify and supplement the geotechnical and hydrogeological information in this report once the final design is available.

It is further assumed that the engineers involved in planning and construction will carry out all required verifications based on the data and information presented here, following the applicable standards of construction technology.
We are available for further geotechnical investigations, consulting, calculations, foundation inspections, compaction controls, plate load tests, and other earthwork-related services.
S
selcuk55li
14 Feb 2022 11:42
K a t j a schrieb:

If that is correct, it would definitely be possible to plan a detached house as well.

I also tried it using this Bayernview and arrived at approximately the same measurements.
K a t j a14 Feb 2022 11:46
A lot of water in the soil. That makes having a basement less attractive.
S
selcuk55li
14 Feb 2022 11:47
K a t j a schrieb:

A lot of water in the ground. A basement is not very appealing here.

That is why the building authority recommended, if a basement is included, to implement a full waterproofing system and measures against heaving. This is why it becomes especially expensive.
K a t j a14 Feb 2022 11:59
selcuk55li schrieb:

That’s why the building authority recommended that if you have a basement, you should do the full system with complete waterproofing and protection against soil heave. That’s why it gets especially expensive.
Yes, I would try to avoid that.