Standard land value - understanding questions from a beginner

Hello everyone

We currently have the option of a building plot that seems very attractive to us.
Brief key data:

[*]800m2 plot in a rural area
[*]Elongated plot, 20x40m
[*]The street is on the short side on both ends, neighbor plots are on the long sides
[*]The plot has a steep slope (approx. 20% gradient)
[*]The plot is completely undeveloped

We have now received the standard land values from the municipality, which are 100 € per square meter, including connection and development costs.
As a construction novice, I am currently immersing myself more and more in the construction world thanks to this forum (it's incredible how much knowledge is in here :-)) - but basically could not find answers to two questions:

[*]There is a distinction between public and internal development costs. Are both types of development costs included in the standard land values, or are only the public development costs included? Or to ask differently: If we simply calculate with the standard land values, do we need to subtract the approximate costs for public and internal development to determine the land value more accurately?
[*]A sloped location is on the one hand something nice, on the other hand it is not so easy/cheap to build on. Are sloped plots therefore valued somewhat higher or lower compared to the standard land value?

I know the actual value depends on many other factors, but for now we want a fundamental understanding of how certain things should be interpreted. Thank you very much for your support!
I tried to find a similar question by searching the forum but was not successful. If I simply wasn’t smart enough to search, please excuse the question. :-)

One distinguishes between public and internal development costs. Are both types of development costs included in the land reference values, or are only the public development costs included there? Or put differently: When we simply calculate with the land reference values, do we have to deduct the approximate costs for public and internal development in order to determine the land value more accurately?

A hillside location has on the one hand something beautiful, on the other hand it is not so easy/cheap to build on. Are hillside properties therefore worth more or less compared to the land reference value in property valuation?

First of all, land reference values are inaccurate and time-lagged public statistical values, whose similarity to meaningful current market price indicators is weak and also very symbolic in boom times. And it is by no means as simple as calculating back and forth between gross and net. You have already correctly pointed out that when buying municipal land, the price indication can consider what will have to be spent on public development – but cannot consider what the builder will have to pay for his branch connections from the street to the house. And it would be new to me if land reference values or even market prices took into account that hillside properties cause increased building expenses. If you are interested in a hillside property, then be clear about the following points: 1. There is no discount for the hillside location (like at the bakery for yesterday’s bread or something). 2. Hill remains hill remains hill. Trying to create a base for a slab-on-ground house with retaining walls and the like would be a Pyrrhic victory. So plan using the slope, make friends with a residential basement. 3. Building proposals for flat plots are not well suited to be implemented on hillside plots. 4. Wooden structures are hardly suitable for use in the ground-contact area; even with a wooden house, the basement will therefore have to be built in masonry construction.

What do you want to do with the data? For the purchase of a property, the standard land value is not a good guide in my opinion. Better orient yourself on current offers in the nearby area. And yes, factors such as slope, development, contamination, ugly neighbors, etc. play an important role in the valuation.

Just to give a sense of scale: Here, you are currently allowed to double the standard land value if you want to buy a property :rolleyes:

Just to give a sense of scale: Here, you are currently allowed to double the standard land value if you want to buy a plot :rolleyes:

Here, you pay 40-60% above the standard land value.
An acquaintance based his offer for a plot on the standard land value and was laughed at. He later bought it at the market price but built two semi-detached houses with friends instead of a single-family house.

With us also BRW x2 for current property offers. Whether they are actually paid, I do not know, but at least the offers disappear quite quickly again. The final price can of course be slightly below that - but I don't believe it (rather even higher).