Comparison of solid house versus prefabricated house

Hello everyone,
we are currently planning a 140 m2 house on a 500 m2 plot.
There are only 2 providers left in the race, one is a prefab house provider and the other is a solid house provider.
We want to build with an air-water heat pump with underfloor heating including 4 KW photovoltaic to balance electricity costs in the long term.
The prefab house provider builds to KFW 55 standard and indicates a monthly cost block for the pump of 35 euros.
The solid house provider builds with regular bricks and advises against insulation according to KFW70 standard, which is 12,000 euros more expensive. As an argument, he states that the costs for the pump would be about 65 euros per month and only about 6 euros per month could be saved through insulation according to KFW70. To get the 12,000 euro investment back, 200 months would be necessary - thus not worthwhile.
What is your opinion on this topic, do you have experience, and how do you assess my approach, would you plan the house differently?
Many thanks and best regards
Andre

I would invest in the insulation! and would definitely prefer a solid house, as these are usually better insulated and easier to insulate, and it is easier to make changes later on; you could also relatively easily add insulation later in a solid house, which is probably more difficult in a prefabricated house.

Regards

Hello Andre,

We want to build with an air-to-water heat pump with underfloor heating including 4 KW photovoltaics to offset electricity costs in the long run.

And how is that supposed to work in practice?

The prefab house provider builds to KFW 55 standard and states a monthly cost block for the pump of 35 euros.
The solid house provider builds with normal bricks and advises against insulation according to KFW70 standard that is 12,000 euros more expensive. As an argument, he states that the costs for the pump would be about 65 euros per month and only about 6 euros per month could be saved through the insulation according to KFW70. To recover the investment of 12,000 euros, 200 months would be necessary – thus not worthwhile.

I always find these statements about expected costs very interesting; do you also get that in writing? I refrain from giving these statements in the consultation and only relay the feedback from my customers. These vary immensely, which is also normal since every person exhibits different usage behavior with the house.

Whether prefab or solid ultimately depends on your decision; it depends on gut feeling. In both cases, there are neither exclusively advantages nor disadvantages; in both variants, the seriousness of the provider or the value retention of the materials used is decisive.

Kind regards

Hello,

I also got an offer for a prefabricated house or timber construction. If you have the money for it, it would certainly be an alternative. However, with all trades included, I would come to a price of about 360,000 euros. With the current offers for a solid house, I come in about a third cheaper. Furthermore, it should be said that I do not intend to heavily insulate my house, as many apparently do here. Otherwise, a central residential ventilation system would be indispensable, and in 20 years I would have nothing but trouble and even more costs with the full thermal insulation, because it is nothing other than hazardous waste. You can also achieve a KfW-70 standard with "normal" building materials.

Hello,

I also got a quote for a prefabricated house or timber construction. If you have the money for it, it would certainly be an alternative. However, with all trades included, I end up at a price of about 360,000 euros. With the current offers for a solid house, I come a third cheaper.

If I believe anything, it's not that you save 120,000 EURONEN with comparable performance.

Right... are only 119,500^^