Architect's offer via LPH 0

Ah ok, thanks. I actually looked at the Danwood 86. Here, the guest room would be unnecessary and the dining area oversized. My current bedroom is 12 sqm, which would be completely sufficient if I have a wall for my 2.7 m wardrobe. I want to have a home office space in the open living area like I do now in the apartment. I hardly ever have guests, and if I do, the couch has a sleeping function… I am a modest, rather minimalist person and the house should be like that too.

A plot is available. I don’t know where Otto is driving to, but I’m still at the very beginning, hence the inquiry to the architect.
I have a concrete idea of what the house could look like and also have a desired floor plan in mind, but I’m still unclear about many parameters, e.g. solid construction or wood, which heating system, KfW 40 necessary or is KfW 55 sufficient (which presumably also influences the heating technology), etc. And I don’t yet know what I need to make a valid decision here.

It’s good that the plot is available. Then you should show it to us, preferably with elevations and with the completed questionnaire in the opening post. Otto is driving straight ahead of you, albeit with confused detail dithering. The heating system is not a suitable first step. Unfortunately, many newbies do it this way, gathering information like a squirrel: not knowing yet in what order they will consume it, first putting it into the pantry. The EH55 is no longer subsidized by KfW and has meanwhile almost been caught up by the current minimum standard GEG2024. You don’t need to fulfill more, it’s not worthwhile. A room program is important at the beginning, a pictorial concrete floor plan not yet. The plot or its elevations speak quite dominantly as to whether the planned bungalow would fit as a house form. Is the "family planning" (staying a bachelor) finalized? (> put the answer in the questionnaire).

@11ant could you please link me a topic where you describe the issue of service phases 1-4?

Ouch, the search term is too short, I hadn’t considered that. Using the search term "Hausbau-Fahrplan" and the exact Google search phrase contained therein, you will find my house-building schedule and my personal advice (with "colleagues" for the colleagues), and with "Leistungsphase" or "Gerddieter" each including the addition "written by: 11ant" the posts on the topic of scope of mandate for the architect. The problem with commissioning only for the first half (i.e. up to and including the building application) is that this reliably finds those architects who are the worst candidates for budget-faithful planning.

And I don’t yet know what I need to make a valid decision here. I would have liked a consultation to find out what suits me and my budget in order to then obtain detailed offers from 3-4 providers. I have no preference regarding construction type (wood or solid construction), it depends on the overall package and ultimately on the price. And yes, of course, I simply asked a few prefabricated house manufacturers [...] As a layman it’s really difficult to evaluate all that…

I do such consultations, construction-type neutral, and during the decision-making phase while the dough is resting, for my advisees with a total of four to five providers (from both factions, masonry and timber), I find out roughly what it will cost and whether in the concrete individual case one construction type would be clearly more suitable.

Therefore I’ve drawn some floor plans and theoretically 75 sqm is more than enough for me. I don’t have a proper room program yet, but that’s a great tip I’ll work on next – thanks. What do you mean by type houses?

Choosing already proven building proposals dozens of times instead of often unnecessary full custom planning reduces risks during execution and has the side effect of being more affordable and allowing the price to be predicted more accurately. You recognize type houses simply because they are listed in the supplier’s catalog. Building a model from supplier X with supplier B would waste the advantages of this approach. I will gladly guide you to find the suitable combination for you (and the mentioned colleagues can do that too). Again, here applies: you have to be able to “read” the plot. Many suppliers advertise the type house only very modestly and prefer to address the customer as an individualist. This wrong development is historically grounded: a few decades ago the "prefab" house was still considered too rigid in planning, and now the industry wants to overshoot the mark in its image change. The masonry builders are joining in on this.

The Danwood 86 is just one example. An even smaller house is not economical. The best example is the choice of heating, as you have already noticed.

Currently I rent an apartment with 67 sqm and that is a great size

Yes, that should be enough.

Here the guest room would be superfluous and the dining area oversized, my current bedroom is 12 sqm, that would be absolutely sufficient if I have a wall for my 2.7 m wardrobe. I want to have a home office space in the open living area like I do now in the apartment. I hardly ever have guests and if so, the couch has a sofa bed function... I am a modest, rather minimalist person and the little house may be like that too.

However, it is probably not possible to implement your 67 sqm apartment with a utility room one-to-one and then rebuild your apartment as a house on 75 sqm. Basically, you have an unhealthy ratio of exterior walls to living square meters. Not economical, not energy-efficient, and not financially a good solution.

I work a lot in the home office and my comfort temperature is 22-23 degrees. I would like a system with which one or a woman ;-) does not have to put much effort into settings, etc.

The house is planned only for me, max. one other person.

Look: what if a second person also requires space? She, the mentioned woman, probably also brings 2.7 linear meters of wardrobe. She may have a different comfort temperature, takes care of social contacts, and would like a dining table that fits 4 people or rather sees you on her day off in a separate room so she can unfold herself on her day off.

Consequently, it is not understandable to do without 10 or 15 sqm if the 75 sqm cannot be built economically. Purely mathematically, the 10 sqm will very likely not be financially decisive, because "only" an additional 10 sqm of flooring, 5 sockets, one room door, and one more window come into play.

Therefore I drew a few floor plans and theoretically manage perfectly with 75 sqm.

Then show them in a new post (as already suggested).