Floor plan of our bungalow

Our architect mentioned an average value of 260k €.

Okay, then it should be fine. I was somewhat guided by the words "limit" and "including equipment" and thought it was an overall budget. But apparently you have the issue under control, all good! Edit: If there is an architect, why isn't there a design from him?

At 260k, you are at 1600€/m² for turnkey.

"Turnkey" in the sense of "without painting work + floor coverings," otherwise it becomes quite tight in Brandenburg due to the external dimensions/roof area. KFW 55 is, in my opinion, not exactly inexpensive either, for a bungalow of this size. Rhine regards

20k € outdoor area

You are building in the second row; the TEUR 20 can easily be spent just on the access path ... and then you still have nothing special. I haven't read the whole thread - just that you should also include a buffer for additional foundation costs in the ancillary construction costs. What if the soil conditions are not so favorable? Rhineland greetings

You are building in the second row;

Connection fees could also cause the ancillary construction costs to soar.

Since we only want to start construction in Oct/2017, we are currently considering whether to follow the architect's suggestion and request all trades ourselves. The construction company would do the extended shell construction and schedule all trades (including those commissioned by us). In connection with a building surveyor, whom we wanted to commission anyway, this sounds worth considering in my imagination, given that just for the construction planning otherwise 10-20k euros are charged (is this amount correct?)...

I don't know if the amount is correct. But you trust yourself with the performance of an architect, which you are not capable of. And now you want to compensate for a service that is supposed to be worth 10-20 thousand? Sorry, but you suffer from overestimation of yourself.

Secretly, I wished that someone would also offer an alternative (e.g. ypg ), but you can't expect someone to do the work that I would have to do myself. But apparently, I am not creative enough to find my own solutions like this one here.

Here one can already read an insight, which does not stop you from continuing to work on the mistake.

(still not given up, ypg I just like the living room with bay window, terrace, and kitchen too much).

Yes, the simplest but most serious mistake one can make: lovingly looking at the 3D visualization oneself, preferably even setting it as a screensaver, so that you no longer perceive the room at all. Other mothers also have beautiful daughters... meaning: if the planning had led you to another room, which would look different than the current one but include the same advantages, you would be in love with that room and wouldn't even notice this one.

It will probably be a record hallway, but with a bungalow of 160sqm there hardly seem to be alternatives (bungalows seem to be rare in this forum, judging by the house photo thread).

Impossible! The first mental step of good bungalow planning starts with how to prevent a turbo hallway or at least present the unavoidable in a positive way. Period. There are no other explanations or excuses or sugar-coatings!

I am so appalled that I unpacked the laptop with my program again.

Is there anything else I need to know before I start drawing?