Is my budget sufficient? 210 thousand euros for a single-family house

well, there is also a position between down and up for roller shutters :)

A big disadvantage of [Außenraffstores]: in autumn you cannot lower them if it gets too windy. An alternative is [Innenstores].

@DerDa

When the sun beats on the window in summer, a half-closed roller shutter is hardly effective as sun protection. Mathematically, of course, it is (half the heat input), but in practice, the place heats up. Interior venetian blinds do not protect against sunlight. The heat is already inside the room.

Exterior venetian blinds are more susceptible to wind than roller shutters, that is true. But it depends on the quality of the venetian blinds, how well they can withstand wind. In sheltered locations (closed, dense single-family house area, trees all around) the wind risk is smaller than in exposed locations on the edge of a field. If the venetian blinds are electrically operated, one can consider a wind sensor.

In the end, everything is a matter of preferences and weighing the arguments. I do not want to convince anyone, but only give food for thought.

Now we have roller shutters everywhere to half/half or even none at all with [Raffstores]. It’s getting more expensive, oh well, then I’m just as fast for wood-aluminum windows as it gets more expensive on the construction site. I don’t want to spoil anyone’s little house, but to warn about unexpected additional costs. I always thought it was like with a car. A ride, one price, license plates on and done. That would be nice.

Well, I didn’t want to start a fight over shutters or not.

Our house with approx. 135 sqm (reputable construction company from Lower Saxony) would have cost about 145,000 turnkey "bare" according to the 2009 Energy Saving Ordinance (ready for wallpapering and floor coverings in EL). (By bare I mean, because further upgrades were important to us.) If we add a (now obligatory) controlled residential ventilation and a few special services, we are at 160,000. No tile upgrades (there are also nice tiles for 25 €), laminate in the living area, converted kitchen, normal shower, excavation in EL, etc., we are at 180,000. Additional costs arise for incidental building expenses.
Garage and external pipe for chimney can be retrofitted. Paths and yard can be filled with gravel.

We just don’t know how the maximum budget of the OP is composed, whether a buffer exists or special payments are already planned.
Where or for whom/how many people the house is to be built.

Addendum: my owner-occupied comfort apartment from a few years ago (it still exists, by the way) has no garage, no shutters, no floor-level shower and no underfloor heating. Nevertheless, it was lived in well and comfortably.

Are these the final costs or an estimate? That sounds quite different from 280,000. OK, with incidental building costs, walls and floor coverings my 210,000 is still not quite enough.

The maximum budget is already 210,000, although with a buffer of 15%, but I would not plan to use that. No matter whom I have talked to so far, for all of them the construction was 10% to 30% more expensive. If I said 240,000 is also possible, in the end it would be 270,000 and that would shift the financing from comfortable to less comfortable. I’m thinking quite strictly here. The house must be paid off in max. 25 years and must not restrict everyday life. The limit is therefore 210,000 with a 15% buffer. If that does not work, I’ll stay in my 95 sqm condominium with shutters and blinds :-))) separate basement and large garage. Three people should live in that house someday.

It does not seem to be enough. A brochure from a regional provider, who offers turnkey with all incidental building costs (ready to move in) for example the following, fuels my concern.
Single-family house with 125 sqm (6.60 * 12.00 m), exterior walls made of aerated concrete, load-bearing partition walls made of reinforced concrete, no basement, ceilings/stairs made of reinforced concrete, gable roof, plastic windows with shutters, carport with lockable storage room, built with house connected, non-load-bearing interior walls made of gypsum honeycomb (10cm), ground floor tiled, 1st floor laminate each up to 23 EUR/sqm, heating by district heating, no underfloor heating, KfW 70 not fulfilled. Offer price 265,000 EUR. I have never heard anything bad about the provider, only satisfied voices.

The 145000 is a fact. In addition, we have underfloor heating, a chimney, Kfw70 equipment, colored windows, few shutters, a walk-in shower, and so on. It adds up, and you can quickly go over budget :( Controlled residential ventilation costs about 11000. That’s why the cost estimate is around 160000. But Lower Saxony (probably also the Hanover area) seems to be among the cheapest in terms of construction prices. I’m not familiar with BW. Maybe hang on a few more years and save some money – now and then look at used properties or check out the foreclosure listings... :)