Construction costs to achieve KFW 55 funding

Hello,

The plot is almost 1000m² in size. Therefore, a heat pump with earth collectors might be an option. For a yearly performance factor over 4.5, new buildings receive €5000 from Bafa.

You do have space, that’s true. On the other hand, in my opinion, a ground source heat pump – even without earth collectors (high planning effort) – is not worthwhile in classic single-family house construction.

The land is estimated at 40K. Included are surveying, soil report, taxes, notary, and additional fees.

What is the original price per square meter, and following that, the question about the building location?

The ancillary construction costs without the base slab and earthworks, as well as interior fittings and exterior facilities (carport), are budgeted at 60K.

A base slab (BP) typically is not included in ancillary construction costs; building without a BP is difficult.

Thus, €250K remain for the actual house.

I don’t quite understand your calculation, but assuming a capital of €250K for the pure single-family house, the calculation might look as follows:

The desired single-family house 160m² with:
- 2-story construction
- Gable roof approx. 30°
- Sand-lime brick with clinker
- Heat pump (air-water or geothermal collector)
- Heat storage
- Central ventilation with heat recovery
- Underfloor heating
- Possibly KNX
- Without fireplace

The goal is to achieve KFW 55 funding. Is this possible?

Single-family house 160 sqm on BP and according to energy saving ordinance: €228K
Facing bricks: €16K
Controlled ventilation with heat recovery: €13K
Surcharge KfW 55: €8K (controlled ventilation mandatory prerequisite)
KNX: from €12K

Air-water heat pump included plus the usual known extras…

- Own work is planned only for the interior finishing. Pulling cables, floor coverings, painting, as well as attic expansion. Paving and roofing also would be done in-house.

That only works if you want to build via architect and with separate contracts. Even then, it is questionable whether more than helper hours are negotiable. It depends on the executing companies.

- Photovoltaics without storage

To achieve which efficiency house status or usage?

I think €350K is quite a lot of money with which it should be possible to build a house to the latest standard. Or am I wrong?

See above.

Rhine regards

We have almost completed our construction contract - about 190 sqm Kfw55 (Energy Saving Ordinance 2014 from before 2016), simple form with gable roof and clinker brick, ground source heat pump, electric shutters. For the house on a slab foundation (excluding land) with standard equipment (including painting and flooring) we have paid so far including ancillary construction costs 320,000 €. In relation, that would mean 270,000 € for 160 sqm. In addition, all exterior facilities, kitchen, and furniture are still to be added.

Hello, You do have space, that’s true. On the other hand, in my opinion, a ground source heat pump – even without ground collectors (high planning effort) – is not worthwhile in classic single-family house construction.

I strongly disagree. The planning effort is not really that high (practically costs almost nothing), and a heat pump with ground collectors does not cost more than an air-water heat pump if you are willing to do some of the installation yourself (subsidies!). But you achieve a significantly higher annual performance factor than with an air-water heat pump. There are already many companies that install ground collectors, and even then it is not as expensive (compared to drilling). Of course, the better you insulate, the less worthwhile expensive heating technology is, because although you save percentage-wise, the base value is low.

Of course, the better you insulate, the less expensive heating technology is worthwhile, because you save proportionally but the base value is low.

That's exactly right; that's why my answer was as before

Rhineland regards

Yes, but with the current energy saving ordinance (2014) and a medium-sized building or larger, the collector can definitely still keep up, especially because of the possible funding it is not much more expensive than air-to-water heat pumps, but much more efficient.

You have space, that's true. On the other hand, in my opinion, a geothermal heat pump - also not with ground collectors (high planning effort) - is not worthwhile in classic single-family home construction.

Why is a heat pump with ground collectors not worthwhile? With this type, you have a high COP all year round, so an electricity-consuming heating element is unnecessary. According to my research, the COP of an air heat pump in winter is just about 2.5.

What is the original price per square meter and following that, the question about the construction location?

The price is €34. It is in the district of Diepholz in Lower Saxony.

A foundation slab (BP) typically does not belong in the ancillary building costs; building without a BP is quite difficult.

Surveying costs building €1,500.00
Building permit €800.00
Earthworks: excavation for foundation slab €5,000.00
Disposal of excavated soil €3,000.00
Pipes (waste/water, electricity) before foundation slab €1,500.00
Rainwater sewage shaft €3,000.00
House connection costs €12,000.00
Construction electricity €800.00
Construction water €800.00
Consumption construction water/construction electricity €1,000.00
Construction site toilet €500.00
Construction debris container €2,000.00
Topping-out ceremony €2,000.00
Insurances €500.00
Ancillary financing costs €500.00
Garden tools €1,000.00
Outdoor facilities €8,000.00
Kitchen / lamps / furniture €25,000.00

Possibly the ancillary costs can also be lower. But this is the initial planning. So I come to 60K.