ᐅ Prefab House Construction – Who Prepares the Plan for the Groundworks?

Our civil engineer planned and carried out the work based on the architect’s and structural engineer’s drawings. The transitions from the concrete slab to the timber construction were coordinated between the civil engineer and the carpenter. I only ensured communication between them. All companies are local and familiar with each other, and they enjoy working together (this was a criterion in our selection).

ypg schrieb:

Many prefab house manufacturers have their preferred slab or basement contractors they work with. I would always have this service handled through the house company because of the warranty.

Good tip!

hellobomm schrieb:

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Could you tell us why you separate the basement/slab and the prefab house builder?

We are building a prefab house without a basement/with a slab and, due to anticipated interface issues, decided not to have the slab constructed by a different company. As a somewhat cautious layperson, I was concerned that we might get caught between the prefab house manufacturer and the slab contractor. I don’t know if we are paying an excessive amount for the slab and everything related to it (9.40m x 9.40m (31 feet x 31 feet), around 20,000 euros), but it’s worth it to us. We were told that if we separate the slab from the house package, the slab builder also has to take over the structural engineering. (?!?)

If I understand correctly, you are building a prefab house with a basement and also need a slab for a garage?

May I ask which federal state or region you are in? Just out of curiosity.

11ant schrieb:

I would (as they say in Bavaria) "never ever" absolve a house provider from the responsibility that the house and its foundation slab fit together perfectly. So why choose a "prefabricated" house in the first place?

Your avatar shows a woman in a wheelchair – how does that fit with a plot that needs leveling? (Hillsides rarely have a gentle enough slope for ramps)

I like the idea of a timber frame house.

As for the plot, it is what it is. That’s why we need to move some soil from the back to the front. The height difference is only 1.8 m (6 feet) over 24 m (79 feet) anyway.

Pinkiponk schrieb:

Would you like to explain why you separate the foundation slab and the prefabricated house builder?

We are building a prefabricated house without a basement/with a foundation slab and, due to expected interface issues, decided not to have the foundation slab done by a separate company. As a somewhat cautious layperson, I was worried about getting caught between the prefab manufacturer and the foundation slab contractor. I don’t know whether we are paying too much for the slab and everything related to it (9.40m x 9.40m approximately 20,000 Euro), but it is worth it to us. We were told that if we separate the foundation slab from the house package, the slab contractor must also take responsibility for the structural engineering. (?!?)

If I understand correctly, you are building the prefabricated house with a basement and additionally need the foundation slab for a garage?

May I ask in which state or region you are? Just out of interest.

Hi Pinkiponk. That has been the view from various sources so far 🙂
Of course, there are interface issues, but it certainly doesn’t hurt to get additional quotes for certain trades. That doesn’t mean one (I) necessarily has to do it that way. That’s why it’s good to hear different opinions in the forum 🙂
The house is without a basement. There is a foundation slab for the house and a foundation slab for the garage.

hanghaus2000 schrieb:

I recently saw a house where the builder planned past the property boundary. That shouldn’t be allowed.

Who submitted the building permit/planning application? The site plan is mandatory for that. Please share it here, then we can take a look to see if it actually works.

Hi Hanghaus2000. There isn’t one yet. We’re still in the preliminary research phase :-)

hellobomm schrieb:

Hi Hanghaus2000. There isn’t one yet. We are still in the exploration phase 🙂

You already have the plot, right? With a slope. Sounds interesting. The forum often helps with deciding where to position the house. Don’t you have any idea yet how you want it to look?