Question: Prefabricated house or conventional solid construction? Underground garage, etc.

  • Erstellt am 2012-08-25 19:23:27

Totti-Amun

2012-08-25 19:23:27
  • #1
Hello everyone,

we have been trying to buy a used house for a year and a half, in which my company should also have a spacious office and showroom. We haven’t succeeded, something is always wrong. The good houses have long since been sold elsewhere thanks to the low construction interest rates.

We have been homeowners for 10 years, a mid-terrace house. That just doesn’t work anymore and should be sold.

So now we got the idea to build new. Basically it’s quite simple, but still so difficult.

The idea now is perhaps to order a prefabricated house. However, the spontaneous visits to a few prefabricated houses today were very sobering because we basically received no information. That would only be possible in a detailed conversation with a salesperson. Massa Haus, Allkauf Haus, Okal Haus. I couldn’t even find out what exactly would be delivered if I order a house XYZ in the basic version. Are there already interior walls included and are they clad and insulated with plasterboard or similar, or do I, for example, have a large open room on the ground floor and see the exterior cladding? Despite asking three times, only a reference to a sales consultation and no statements.

Okay, that’s fine... I also understand that they want to (and do) make money on the extras and a standard house in basic version is not desired for sale.

Now about what I have in mind:

Maybe someone can tell me off the cuff what would be a better choice for us and what might simply make more sense.

I am 42 years old, self-employed, work from home (online trading and home office for another company), my wife is 36 years old and works externally. No children, 3 cats. ;)

Ideal idea, setting aside the still-to-be-found plot that must have at least 1,000 sqm:

Detached single-family house, living area 130-140 sqm.

Ground floor: only kitchen (possibly with pantry), living room and dining, guest WC. No other rooms needed.

Upper floor: bedroom and 2 rooms, one for me and one for my wife. Also the bathroom with shower and bathtub.

Basement: normal floor height, 2 rooms for utility/laundry and one for junk.
Also a very large room as an office and showroom for me, furthermore I need another room, hobby room/mini workshop.
The basement, or rather the lower ground floor, should be accessible from outside, ideally with a wide ramp leading downwards, I don’t like stairs. I also have the idea to build the basement larger than the house so that I have more space for my business activities. For example, basement under the terrace.

Dream idea: Since a downward sloping ramp is to be built anyway, build it 3 m wide as a driveway straight through to an underground garage. Advantage: No garages on the property, on top level lawn or terrace and that’s it. Reason: I have 2 classic cars in addition to my actual car and 2 trailers, all could be parked inside and dry. Size about 8 m x 7 m. Possibly also with access to the basement.
I don’t know if something like that is financially feasible, what requirements such a thing would have, and if you would be allowed to build that everywhere.
My wife gets a 1.5-car garage where the lawn mower etc. should also go.

I want to draw a sketch of how I imagine this whole basement thing with underground garage…

Heating: dream would be geothermal. So underfloor heating. A few panels will certainly go on the roof, also the house must have a chimney for 1 to 2 open fireplaces. It’s a quirk of mine, I want to be able to survive in the house in winter even during a power outage… ;)

Super dream: swimming pool in the garden. I recently read a super interesting report where someone constantly channels the excess produced heat into his pool, quasi as storage. Instead of wasting it.

That’s it…

Since we have no descendants and don’t plan any, the house theoretically only needs to last 40 years, after us the flood… That would speak pro prefab house and contra solid house.

These are the basic conditions.

If you build something like that into the ground, does it make sense to simply put a prefab house on it or is that nonsense and you should rather continue building solid and put a cube or similar on it?

Of course, we also have to talk about costs in this context:

What will be cheaper for me when the basement is finished?

Who can simply tell me what the fundamental disadvantages of a prefab house are? The knock test in the prefabricated houses on the walls today has been passed by all houses, everything sounded quite solid.

Best regards and thanks in advance

Totti

P.S.
I should perhaps add that I am actually a trained carpenter (construction and furniture, but of course no longer working in that profession). That means I would even be willing to contribute some own work in a limited scope. Limited means limited, I have to take care of my company at least a few hours every day. But installing windows is no problem, whereas prefab houses are prepared for that anyway. But also interior doors and all that stuff are no problem. However, I have no desire at all for plasterboard walls, at least not the filling and sanding stuff.
 

Bauexperte

2012-08-25 23:03:32
  • #2
Hello Totti,


Did you also deliberately choose the right ones :rolleyes:


Up to this point it costs EUR 210,000 for a solidly built single-family house with 140 sqm pure living space, built according to the Energy Saving Ordinance and without painting work and floor coverings.


Cost good EUR 50,000


The “ramp” over 15.0 m should be within the range of EUR 4,000, a cellared terrace (9.00 x 4.00 m) all in another EUR 30,000


So a total of 5 parking spaces. For “normal” sized underground garages one roughly calculates EUR 25,000 per parking space, for an underground garage as you envision you should reckon EUR 30,000 per parking space. Added to this is the ventilation and in your special case, the temperature control for the classic cars. I can hardly estimate the costs, but it would probably require another good EUR 20,000.


At 3.00 x 9.00 m including sectional door EUR 10,000 as a prefabricated garage.


Geothermal energy depends crucially on the area where you want to build. RWE and Rheinbraun are digging intensively and thus lowering the groundwater level. Otherwise, the geothermal heat pump with a 100 m borehole costs about EUR 15,000. The chimney flue, two-channel, costs from basement to roof good EUR 5,000.


You should decide that if the numbers haven’t scared you so far; a pool brings a lot of recurring costs ;)


Since you need different providers for this project than your initially mentioned tentative attempts – so different caliber of prefabricated house providers – the question is easy to answer: the solid house provider.


There are equally advantages and disadvantages of both construction methods. Ultimately your gut feeling will decide between solid or prefab construction.

Best regards
 

Totti-Amun

2012-08-29 10:05:04
  • #3
Hello construction expert,

thank you already for your feedback.

One question: With a normal ceiling height of the basement and the underground garage: How long does the ramp up and down have to be approximately? Are there experiences without a normal non-lowered vehicle scraping?

Are there general uncertainties with an underground garage? So can I just normally submit a building application and am I allowed to do this basically on any buildable plot? It is important for me to know whether I have to place 5-6 garages above ground or if in the end everything is reasonably hidden.
I know that the final word lies with the city. But is something like this typically rather rejected than 5 garages? Who has experience?

Regards

Totti
 

Wastl

2012-08-29 11:46:19
  • #4
Hello Totti,

in our municipality, we only reject underground garages in the water protection area. Otherwise, the municipality is grateful for every parking space you build additionally. We have a parking space regulation that prescribes how many are allowed. In areas with a development plan, it specifies whether you are allowed to build an underground garage and how large it may be. Without a development plan, underground garages outside the building boundaries and not complying with setback areas are often approved. So, in general: Yes, underground garages are often approved here.
You have to apply for them - whether you are allowed to depends on the property. But you can apply for anything. Maybe it will also be approved as an exception in case of prohibitions - it always depends on the current mood of the committee.
Regarding the ramp: In our town, there are wild inclines - in one specific case, the municipal council agreed, but the district office vetoed because the incline was too extreme. So, not everything is possible, but very much is.
 

Totti-Amun

2012-08-29 11:58:44
  • #5
Ok, thanks already.

The whole thing will be a single-family house and the underground garage a completely private one. But I think it still looks better visually than if you put 5-6 garages on a roughly 700-1,000 sqm plot. And I can use the area on the UG, lawn area or extended terrace or whatever...

I will have a drawing created, so that a preliminary request can be submitted to the relevant city.

First, the search for the plot begins, as until two weeks ago we still wanted to buy a used property. But nothing has been found for 1.5 years.

The plot should be in NRW, in the triangle between Essen -> Mettmann -> Wuppertal -> Sprockhövel. The closer to Bredeney, the better (my wife works there). Absolutely quiet location is a basic requirement, preferably still rural. No through road.
What everyone is looking for... :D

Regards

Totti
 

Bauexperte

2012-08-29 13:16:10
  • #6
Hello,

regarding your questions about the TG, my predecessor has already answered correctly.


First, look for the property :-)


It's all a question of money :-) Essen => expensive, W´tal => plots affordable, but since it's quite hilly there, a lot of additional costs for basement and TG, Mettmann => expensive.

Kind regards
 

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