Construction costs are currently skyrocketing

Our building permit is approved, currently the trades have been tendered. The first offers are almost shocking. There are already corresponding reports about this - but until now I could not imagine that construction prices are currently skyrocketing so extremely. Are you having similar experiences?

: This initial post of yours is dated March 2021. What is your current view, outlook, mood, situation? Thanks, by the way, for this exceptionally interesting, lively, and informative thread. :)

On Friday I had a moment that really made me think. Our boss had a 10m3 oil tank installed at the company. With an additional trailer that apparently contains a mobile heater. I don’t know how a bit of oil will help with 15,000m2 of space, but it was probably meant to bridge some time, maybe to protect the machines by maintaining a basic temperature. Now I’m considering finally putting our fireplace into operation. And buying wood. As a child, I often experienced these blackouts where there was no electricity for hours. As a kid, that didn’t matter, but as an adult with children, it makes you think a lot. Maybe the oil heating owners with the tanks aren’t in such a bad position this winter.

At least our oil heating doesn’t run completely without electricity either. If the power goes out, a full tank won’t help you, unless you have your own power source/battery.

Indeed, in my opinion, the energy savings from controlled residential ventilation with heat recovery are also overestimated in the energy consultant’s calculation. For example, nobody ventilates their house every 1-2 hours at -15°. 1m3 of air has about 0.3 wh/K.

With 500m3 and 10° temperature difference, that would be 1.5 kwh.

Nevertheless, controlled residential ventilation is simply comfort and luxury, just like automatic garden irrigation and robotic mowers.

If you want to reduce costs, you have to start somewhere.

I see it that way too. We canceled the controlled residential ventilation simply because we did not receive KfW55 funding and the cost is already enormous.

I would indeed like controlled residential ventilation with heat recovery, but given the current situation, I am just glad if prices do not explode.

Oil heating also does not run completely without power.

Oil = diesel = power generator Everything possible.

Actually, in my opinion, the energy savings from controlled residential ventilation with heat recovery are also exaggerated in the energy consultant's calculation. For example, nobody ventilates their house every 1-2 hours at -15°.

Of course, there is certainly some exaggeration. On the other hand, the costs are also often poorly calculated. And that is simply energy that is uselessly blown into the environment. Regarding the price... if a ventilation system with heat recovery is included as standard even at Town & Country, I only accept the argument to a limited extent. It doesn't always have to be the luxury variant of a central controlled residential ventilation with an enthalpy exchanger.

1m3 of air has about 0.3 wh/K. At 500m3 and 10° temperature difference that would be 1.5 kwh.

I can't quite follow your calculation right now. Over what period are you calculating (per day?) and is the 10 degrees the temperature difference? I can guarantee you that even in mild Konstanz the temperature difference inside-outside over winter is well above 15 degrees. Where we are moving to, average temperatures in December-February are below zero degrees, so more than 20 degrees difference. And then we arrive at completely different values.

The delta T must be the one that you get in the room air by ventilation.

That means: If you achieve 10 degrees less with one quick ventilation, it costs 1.5 kWh of heat, provided the room volume is 500 cubic meters.