Construction costs for a single-family house with a basement in NRW

Oh Rafaelsen,

I'm not the first and certainly not the last to come around with this amount or something comparable.

If you want the basement outside the thermal envelope, that's of course possible. But then neither the heating system nor a hobby room can be there. You can only store car tires, bicycles, canned goods, and potatoes there.

Familiarize yourself with the Energy Saving Ordinance and the conditions required by it. You can't just build anything however you want. What belongs inside the envelope, what outside.

Partially insulating the basement makes no sense at all.

You are still way too early in the process to talk about such details now.

1500 euros is just as realistic as 1400 or 1800 euros. It depends.

You can also calculate based on cubic meters and reckon with 300 euros. In the end, it always somehow comes out about the same. At least with this size, always far from 200,000.

Oh Rafaelsen,

I'm certainly not the first nor the last to come up with this amount or something comparable.

If you want the basement outside the thermal envelope, that’s of course possible. But then there must be neither heating nor a hobby room there. You can only store car tires, bicycles, canned goods, and potatoes there.

Familiarize yourself with the energy saving ordinance and the conditions required by it. You can't just build anything anyhow. What belongs inside the envelope, what outside.

Partially insulating the basement makes no sense at all.

You are still far too early to talk about such details.

1500 euros is just as realistic as 1400 or 1800 euros. It just depends.

You can also calculate by cubic meters and estimate 300 euros. In the end, it somehow always comes out about the same. At least with this size always far from 200,000.

That wasn't even the question. The question was whether you also calculate like that if you build without a basement.

But why a utility basement needs heating is beyond me. The basements I know never have heating in the utility area.
Also, insulating a basement is neither elaborate nor particularly thick. The temperatures in the ground are constant after all. I've also seen basement insulation from the inside. Whether that's good, no idea. The people I know who built with basements always built a utility basement and then finished a part afterwards. Though it's not the full ceiling height, they all have 2.2 or 2.3 meters. Heating was always installed as well.

You can calculate however you want. Whether with flat rates, together, separately, or step by step. There is no one correct calculation. But no matter how you calculate, you will always end up with the same total.

And the houses you know there, are they all new-build houses from the last 10 years?

Again: If you have to build with a white tank today and want to put something decent inside, you need at least partial heating there. Also, the heating system is supposed to go in the basement. All rooms with heating and where the heating system is located must be included in the thermal envelope. So you insulate the entire basement because of legal requirements. And then, for the system to work, there must be heating everywhere. And if you have underfloor heating everywhere else, maybe even with a heat pump instead of gas, you also need at least a rudimentary underfloor heating in the basement because radiators make no sense due to the low supply temperatures.

And then the basement costs almost as much as normal living space. I’m not going to argue now about 100 or 200 euros more or less per square meter.

Not everything you see in an old house is still allowed or possible today.

It's best if you convince yourself of the numbers. You don't want to listen to us anyway.

If you want to build cheaper, remove equipment!!!

Start with "without" a basement with around 10sqm increased living space (no more), no KfW55, then remove electric shutters, if ventilation then decentralized or remove entirely, no lift-and-slide door, etc., then you'll also come to your 330k€.

Best you calculate the things nicely for yourself. You don’t want to listen to us anyway.

If you want to build cheaper, remove features!!!

Start with "without" a basement with about 10sqm increased living space (no more), no KfW55, then remove electric shutters, if ventilation then decentral or none at all, no lift-slide door, etc., then you’ll also reach your 330k€

This has nothing to do with sugarcoating, but with prices that are justified. And 450k for a 150 m³ house with medium features simply are not.

Also, the comparisons drawn here are inconsistent.
Toxicmolotow writes: And then the basement costs almost as much as normal living space
Then you should get an additional 90 m² for the same price. And not just 10.

KfW 55 only saves 10 kWh per m²/a compared to the minimal requirement of the energy saving ordinance. It makes no sense at all to build KfW 55.

You can calculate however you want. Whether with flat rates, together, separately, step by step. There is not one correct calculation. But no matter how you calculate, you will always end up with the same total.

And the houses you know are all new builds from the last 10 years?

Again: If you have to build today with a white tank and want to put something decent in it, you at least need heating there. Also, the heating is supposed to be in the basement. All rooms with heating and where the heating system is located must be within the thermal envelope. So you insulate the entire basement because of legal requirements. And then, for the system to work, there has to be heating everywhere. And if you have underfloor heating everywhere else, maybe even with a heat pump instead of gas, you also need at least a rudimentary underfloor heating in the basement because radiators make no sense due to the low flow temperatures.

And then the basement costs almost as much as normal living space. I’m not arguing over 100 or 200 euros more or less per square meter now.

Not everything you see in an old house is still allowed or possible today.

Yes, partly older than 10 years. But still in good condition, with a pleasant living climate and heating costs around 100 € per month. Currently, we live in a thermal flask from 2010 with poor indoor climate, condensation on the windows, and immediate overheating when the outside temperature rises a bit. And the heating costs of 50€ per month are not worth the climate.

What about a pure utility basement? But insulated? And then simply converting it later?