ᐅ House construction costs per KfW efficiency level per square meter

I have not compared current prices yet, as we did not receive the contract last year. We decided against committing to a KfW 40 building project last year because KfW 55 actually meets our needs. The question now is whether you can roughly say that a KfW 40 house costs, for example, €40,000 (about $44,000) more than a KfW 55 house, or something similar. The next step will be to assess whether there are optimal combinations. The application phase will only start again in September/October, and we just want to prepare for that.

The plots are all flat (possibly with a depression to be filled), and we want to build two full floors of about 140–150 m² (1,500–1,615 sq ft). Exact floor plans or anything similar do not exist yet, as we plan to design those only after purchasing the plot.

Wassermann schrieb:

2100/2200 €/sqm (square meter) is completely unrealistic in my region (Bavaria, but 50 km (30 miles) from a larger city).

2800 €/sqm (square meter) is the current average from the general contractor for the energy saving regulations.

Exceptions prove the rule, and with own labor or compromises it can of course be cheaper...

P.S. I just read that you also mentioned your region. So you can ignore my post :-)
I’ll leave it here for the information of others anyway

In Brandenburg, I would currently estimate around 2,500 €/sqm (square meter) for KfW 55 standard with some extras. That way, you are on the safe side.

It largely depends on the general contractor. In the end, we worked with one who does not even offer KfW 55. Their standard is KfW 40/passive house. The price per square meter was quite similar to two prefab house suppliers at KfW 55.

11ant schrieb:

In my opinion, the KfW40 standard is specifically aimed at the group that "spends their above-average salary at organic food stores" (who often arrive there in an SUV). I find it rather cynical to award more social points for this, just because this offer appeals to a higher-earning applicant group.

If the additional social points for KfW40 applicants on the property determine whether you even get into the lottery, I would recommend looking elsewhere. I fear the next step might be awarding bonus points for vegan kindergartens.

There are development areas where Passive House standard construction is mandatory. When we built, our general contractor had projects in such areas. I think that’s really unfortunate—just another way of saying, "we don’t want people like you here."

Wassermann schrieb:

From my quote (timber frame construction)
Additional cost for perimeter insulation = 5,568 €
Additional cost for roof insulation = 1,166 €
Additional cost for front door = 1,148 €

11ant schrieb:

At least your additional costs sound unusually small-scale.

@11ant maybe you’re just not very familiar with the scale of timber frame construction costs 😉? In our case (timber frame with mineral wool), the additional costs were even lower:
better thermal conductivity class for walls and roof = about 2,100 €
better glazing package = about 1,000 €
detailed thermal bridge calculation = about 500 €
Additionally, on the ground floor the insulation below the underfloor heating had to be 4cm (1.6 inches) thicker. Since this item was overlooked within the plumbing/heating trade, I don’t have a separate price for it... but it probably wasn’t much. The thermal bridge calculation is actually the key trick – for timber frame it can even have a positive effect, which brings significant improvements compared to the flat rate.

For clarity, it should be mentioned that the standard of our builder was probably already better than KfW55, so our above measures were quite moderate. Of course, I understand that we are partly talking about theoretical paper tigers that don’t necessarily affect the actual energy demand in practice. But that’s not the point here; it’s about how @HausbauProjekt can earn bonus points for the plot. And at least if timber frame is an option, KfW40 is not a particular challenge.

HausbauProjekt schrieb:

Last year, we decided against committing to a KfW 40 construction project because KfW 55 actually meets our needs. [...] The application phase will only open again in September/October, and we just want to prepare for that.

Am I understanding correctly that, as unsuccessful applicants from last year’s lottery round, a) you are not automatically entered into the new lottery and/or b) you now have the option to decide whether to include KfW 40 bonus points? Also, are the same plots involved, or are different plots allocated specifically for KfW 40 compared to those without it?

Hangman schrieb:

And at least when timber framing is an option, KfW 40 is not a particular challenge.

With timber frame construction, KfW 40 is achieved differently than with masonry houses: the thermal insulation is integrated, and if you want it thicker, you simply use thicker studs, but the wood remains the same. For masonry houses, the process is more complex; for the added exterior insulation system (ETICS), a different type of brick or block is often used than for solid masonry walls. For the general contractor, this requires rethinking, and many are reluctant to do so, charging significantly higher fees for the upgrade. The price difference therefore depends considerably on the supplier’s pricing policy.

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