Small semi-detached house with pitched roof - recommendation?

For a single-family house (also applies to a semi-detached house) a flat rate is calculated BJ 2019 €2000 (€2100)/sqm living and usable area, Energy Saving Ordinance 2016, plastered, normal standard (upscale must first be explained) without KNX and the like, simple design Additional construction incidental costs of 40-50 thousand Garage, carport, outbuildings, cellar, landscaping and paving extra

I would rather assume €2,100/sqm + X if you then build in 2021.

there is already a development plan.

And the question was whether the "E/D" or even just "D" is provided for this plot, because only then does your width calculation add up.

I would rather expect €2,100/m² + X if you build in 2021.

I cannot look into the future. If the interest rate goes up again, it is possible that construction prices will stagnate. Or? Or what about the Corona unemployment rate... will building then become cheaper?

It is also possible (my assumption) that construction prices remain the same, but the construction quality decreases: you can no longer save on the few power outlets, but what I just read about non-load-bearing interior walls no longer being solid, it may be that layout changes then cost €5,000 or that earthworks (up to 30 cm) are no longer included. The one exterior lighting is no longer included, no outdoor water tap, (containers were already abolished 5 years ago), no Porta Potty and there are no more tiles in the hallway either. Then, although building has become cheaper, you still pay 10% more. Prefabricated houses are generally more expensive in the small single-family house sector. Danwood? I quite like Danwood... nice houses... but every little extra costs money. Foundation slab, transport, architect fees... these are not listed in the catalog and already add up to €25,000 extra.

Our general contractor said that currently wood prices are skyrocketing because the German market is being bought out by the Americans and the Chinese. In addition, according to him, many heating system installers have already announced price increases for 01.01. For example, Zimmermann announced a hefty 5% increase for the Proxon LLWP.

Our general contractor said that currently wood prices are skyrocketing because the German market is being bought out by the Americans and the Chinese.

Furthermore, according to him, many heating system installers have already announced price increases starting from 01.01. For example, Zimmermann for the Proxon air-to-air heat pump is raising prices steeply by 5%.

Of course, he says that. There are price increases every year. And if it's not the Chinese, it's the bark beetle.
Besides, he now wants to keep his "promises" if interested parties sign now – because then the price remains favorable for the builder, he says.

Our general contractor said that currently the wood prices are skyrocketing because the German market is being bought out by the Americans and the Chinese.

Rather the opposite. The German wood producers don’t even know what to do with all the wood. There are still piles left from the storms of recent years. Especially the export prices have collapsed massively (30-40%).

The general contractor is using alternative facts